Genetic Components Derived Parameters and Heterosis in Okra under Saudi Arabia Conditions

Four parental genotypes of okra were crossed in complete diallel design to study the direction and extent of relative heterosis and heterobeltiosis for yield and its associated traits for utilization of existing genetic diversity to develop heterotic F1 hybrids in okra. The additive genetic component (D) was significant in all studied traits except average pod weight. Nonadditive (H1 and H2) components were found to be significant in all studied traits. However, the values of the dominant effect (H1) were smaller than the D components for no. of nodes/plant, no. of pods/plant, weight of medium pods, weight of large pods, and total fresh pod yield. The maximum significant MP heterosis in the desirable direction (149.9%) was recorded for the weight of large pods/plot. The maximum significant heterobeltiosis in the desirable direction (120.1%) was recorded for the weight of small pods/plot followed by total fresh pod yield (107.4%), the weight of large pods/plot (104.9%), weight of medium pods/plot (92.1%), average pod weight (51.8%), number of pods/plant (38.4%), and plant height (34.3%). It could be concluded that plant height, average pod weight, and the number of branches could be considered for the development of elite hybrids (heterosis breeding) or inbred lines (pure line selection) in succeeding generations. Therefore, these parameters can be considered for selecting genotypes to improve the pod yield of okra. The superior crosses identified through heterosis analysis were Egyptian Balady × Line 4.1.18 (30.8 ton/ha), Line 4.1.18 × Egyptian Balady (29.8 ton/ha), Dwarf Green Long Pod × Line 4.1.18 (28.3 ton/ha), and Egyptian Balady × Dwarf Green Long Pod (27.6 ton/ha) as these crosses had high performance as well as significant and higher estimates of heterobeltiosis for fruit yield per plant and yield attributing other characters.


Introduction
Okra (Abelmoschus esculentus (L.)) belonging to the Malvaceae is a warm-season crop that is a traditional vegetable crop commercially cultivated in tropical and subtropical regions of Asia and Africa [1,2].Higher yields are obtained with hot weather (temperatures above 26 °C), especially in regions with warm nights (>20 °C) [3].It is an annual vegetable crop that is grown for its pods consumed as vegetable [4].According to [5], the immature fruits (pods) of okra, which are eaten as vegetables, can be used in salads, soups, and stews and fresh or dried, fried, or boiled.
Notwithstanding yield, natural product quality assumes a signifcant part in okra efciency and attractiveness.Except for the characteristic pod length, which is indicated by the United States Department of Agriculture [6], the criteria for defning fruit quality are not entirely clear.Fresh market okra is usually graded into three sizes, i.e., fancy: pods up to 9 cm long, choice: pods 9 cm to 11 cm long, and jumbo: pods over 11 cm but still tender [7].Tese sizes are preferred in the commercial and industrial sectors, although smaller fruits are generally accepted.
A lot of variability in yield, number of days to maturity, number of pods, and plant height are showed in local varieties, and the production does not meet the demand of the population.Terefore, it is of great value to suggest better cultivars than those presently grown.Little breeding has been done on okra in Egypt or Saudi Arabia, although improved crop cultivar is one of the prerequisites for high yield.One of the tools in overcoming yield barrier and increasing productivity is heterosis breeding.Several researches have reported occurrence of high heterosis for yield and its diferent components [8][9][10][11].Te presence of adequate hybrid vigour is an important precondition for successful hybrid varieties production.Te primary selection of involved parents in any efective hybridization programme depends upon the nature and magnitude of relative heterosis and heterobeltiosis.Heterosis exploitation is frstly dependent on the screening and selection of available germplasm that could be produced by better combinations of important traits [12].Heterosis breeding is based on the identifcation of the parents and their cross combinations producing the highest level of transgressive segregates [13][14][15][16][17]. Te choice of the best parental matings is crucial for the development of superior hybrids.Te heterosis magnitude provides a guide for the choice of desirable parents for developing superior F 1 hybrids.It also helps in choosing adequate crosses for commercial exploitation as well as in breeding programme.Terefore, the present work aims to study the direction and extent of relative heterosis and heterobeltiosis for yield and its related traits in 4 × 4 complete diallel crosses to use of existing genetic diversity for develop heterotic F 1 hybrids in okra.

Materials and Methods
Te material used in this study consisted of four diverse genotypes of okra (Abelmoschus esculentus (L.) Moench), namely, P 1 (Egyptian Balady cv), P 2 (Line1.64.18),P 3 (variety of Dwarf Green Long Pod produced by Kitazawa, Seed Company, USA), and P 4 ( Line4.1.18).Both P 1 and P 3 were purchased locally while P 2 and P 4 were selected by the 1 st author.Tis experiment was conducted in Al-Kharj Governorate, Saudi Arabia, during the three summer seasons of 2018, 2019, and 2020.Five typical plants from each of the parental genotypes were selected and used to produce a 4 × 4 diallel cross including reciprocals during the summer season of 2018 in a private Farm, Al-Kharj, Saudi Arabia.Te derived 12 F 1 hybrids (6 single straight and 6 single reciprocal crosses) and four parents were sown on February 25 th , 2019, in a 4-replicate randomized complete block design to assess the genotypes performance as well as recrossing and producing F 1 seeds to reevaluate next season.In February 11 th , 2020, all entries (12 F 1 crosses and 4 parents) were grown in the same way as the previous season.All agronomical practices especially the irrigation and fertilization were followed to keep the crop in good condition.Selection of parents for present investigation was based on better adaptation and desirable agronomical characters.Te individual plot was of 3 m length × 3 rows (30 plants/plot).Distance between rows was 60 cm and within row was 30 cm.Observation was made in parents and F 1 hybrids in each replication for 14 characters, viz., plant height (PH, cm), no. of branches (NB), no.nodes/plant (NN), no. of days to fowering (Flow), pods length (PL, cm), pods diameter (PD, cm), early maturity (EM, days), number of seeds/pods (NS), number of pods/plant (NP), average pod weight (APW, g), weight of small pods/plot (WSP), weight of medium pods/ plot (WMP), weight of large pods/plot (WLP), and total fresh pods (FPY, ton/ha).However, mean fresh weight (g) of okra fruits was determined by weighing fruits individually in a digital analytical balance (±0.001 g).Reported values correspond to the average of at least 50 fruits per category and per genotypes.Data were recorded during the two seasons of 2019 and 2020 and then the combined data over the two seasons were calculated and statistically analyzed.Te local meteorological data in the experimental region during the studied season as an average for the 2019 and 2020 evaluation years are shown in Figure 1.

Statistical Analysis.
Genetic components of variation from the F 1 were obtained as illustrated by Hayman [18,19].Te covariance matrix of Hayman [19] was used to provide estimates of the standard error for the genetic parameters D, H 1 , H 2 , and F. Tese parameters provided the estimation of the following ratios: (H 1 /D) 1/2 : measure the average degree of dominance over all loci; (H 2 /4H 1 ): measure the mean value of the product U and V which are the frequencies of positive (u) and negative (v) alleles in the parents.It has a maximum value of 0.25 when p � q � 1/2.However, broad and narrow sense heritabilities were estimated according to the diallel analysis system.

Mean Performance of the F 1 Hybrids and Teir Parents.
High signifcant diferences among the parental genotypes and the crosses were generally detected for all studied traits.As shown in Table 1, the mean of four parents values for plant height is 151.4 cm with a range from 133.6 (P 3 ) to 166 cm (P 4 ).Teir 12 F 1 hybrids (6 straight and 6 reciprocal crosses) ranged from 142.4 cm (P 2 × P 4 ) to 195.2 cm (P 4 × P 3 ) with a mean of 173.2 cm.Plant stems were not shorter in any of the crosses than the shortest-stem parent (over all parents).On the other hand, plants of cross P 2 × P 4 developed stem signifcantly shorter than respective shorter-stem parent.Five out of 6 crosses of one direction and all the six reciprocals had plant height signifcantly above the midparent value corresponding to each of them (values of average heterosis in Table 2 express this results).
For number of branches per plant, the obtained data showed that the parental genotypes P 1 and P 2 recorded the highest number (3.9 branch/plant for each), while the lowest number of branches per plant (3.2) was obtained by the genotype P 3 .Among the all studied crosses, "P 3 × P 4 ," "P 1 × P 2 ," "P 2 × P 1 ," and "P 3 × P 1 " showed the highest number of branches (4.3, 4.2, 4.2, and 3.9, respectively), while the lowest number (2.9) was observed in the cross  1) ranged from 5.6 cm to 6.6 cm with a mean of 6.2 cm.Te genotype P 4 was the best parent; meanwhile, the genotype P 1 displayed the poorest value.Te corresponding set of F 1 straight hybrids had a mean value of 5.1 cm and ranged from 4.2 cm to 6.2 cm.Te F 1 reciprocal crosses ranged from 4.4 cm to 6.1 cm with a mean of 5.4 cm.Regarding pod diameter (cm), the mean parental value is 1.44 cm with a range of individual value from 1.3 cm to 1.6 cm.Te corresponding set of F 1 straight hybrids had a mean value of 1.33 cm and ranged from 1.13 cm to 1.44 cm.Te F 1 reciprocal crosses ranged from 1.12 cm to 1.40 cm with a mean of 1.28 cm (Table 1).Te parental values for early maturity date (Table 1) ranged from 57.7 to 61.2 days with the mean of 59.5 days.Teir 6 F 1 straight hybrids ranged from 57.8 to 62 days with a mean of 60.2 days.Te mean value of early maturity date of 6 reciprocal crosses is 59.7 days with a range from 58.1 to 62.6 days.Te ranking of parental genotypes is as follows: P 2 (earliest) and P 3 (no signifcant diferences between them) and both P 4 and P 1 (latest).In general, it could be noticed that P 2 , the F 1 straight hybrid P 1 × P 3 , and the reciprocal hybrids P 3 × P 2 and P 2 × P 1 behaved as the earliest genotypes for maturity.Te mean of the parents for number of seeds per pod is 80.9 seeds with a range from 66 to 92 seeds.Te corresponding set of F 1 straight hybrids had a mean value of 92.51 seeds and ranged from 69.2 to 106.6 seeds.Te F 1 reciprocal crosses ranged from 66.3 to 97.4 seeds with a mean of 85.92 seeds.
Regarding number of pods per plant, a great variation among the studied entries (Table 1) was detected.Te parental values for number of pods/plant ranged from 148.7 pods (P 1 ) to 203 pods (P 4 ) with the mean of 177.8 pods.Teir 6 F 1 straight crosses ranged from 194.9 pods (P 2 × P 4 ) to 258 pods (P 3 × P 4 ) with a mean of 232.3 pods.Te mean value of this trait for 6 reciprocal crosses is 210.2 pods with a range from 179.3 pods to 239 pods.Te mean performance of average pod weight for the 4 parental genotypes and their F 1 hybrids (including reciprocals) is presented in Table 1.Te parental values ranged from 4 g (P 1 ) to 5.5 g (P 4 ) with the mean of 4.6 g.Teir 6 F 1 straight hybrids ranged from 4.1 g (P 2 × P 4 ) to 7.4 g (P 1 × P 4 ) with a mean of 5.9 g.Te mean value of pod weight of 6 reciprocal crosses is 6.6 g with a range from 5.3 g (P 4 × P 2 ) to 7.5 g (P 4 × P 1 ).Te parental mean values for weight of small pods (kg/plot) are given in Table 1.Te mean of four parents' values is 7.28 kg with a range from 5.675 kg (P 2 ) to 9.748 kg (P 4 ).Teir 12 F 1 hybrids (straight and reciprocals) ranged from 5.997 kg (P 4 × P 2 ) to 16.294 kg (P 1 × P 4 ), with a mean of 11.478 kg.Te corresponding set of F 1 straight hybrids had a mean value of 12.529 kg and ranged from 7.286 to 16.294 kg.Te F 1 reciprocal crosses ranged from 5.997to 14.342 with a mean of 10.249 kg.Te mean performance of the parental genotypes and their F 1 hybrids for medium pods weight is presented in Table 1.
Te parental genotype P 4 gave the heaviest pod medium weight (24.514 kg), while values of the other three genotypes ordered as 15.135 kg (P 1 ), 19.661 kg (P 2 ), and 20.853 kg (P 3 ).On the other hand, the corresponding set of F 1 straight hybrids had a mean value of 35.011 kg and ranged from 24.169 to 43.404 kg.Te F 1 reciprocal crosses ranged from 26.139 to 42.270 kg with a mean of 32.273 kg.
As for weight of large pods, the mean of four parent values is 19.441 kg with a range from 13.314 kg (P 1 ) to 21.02 kg (P 3 ).Teir 12 F 1 hybrids (straight and reciprocals) ranged from 23.454 kg (P 4 × P 2 ) to 42.901 kg (P 1 × P 3 ), with a mean of 33.161 kg.Te corresponding set of F 1 straight hybrids had a mean value of 34.378 kg and ranged from 24.738 to 42.901 kg.Te F 1 reciprocal crosses ranged from 23.454 to 41.706 kg/plot with a mean of 32.273 kg.Data of the total fresh pod yield for 4 parents and their 12 F 1 hybrids (including reciprocal) are presented in Table 1.Te yield for the studied parental genotypes ranged from 9.829 (P 1 ) to 18.612 ton/ha (P 4 ) with a mean of 13.864 ton/ha, while the average for the F 1 straight hybrids ranged from 13.471 ton (P 2 × P 4 ) to 30.845 ton (P 1 × P 4 ) with a mean of 23.134 ton.On the other hand, the average for the F 1 reciprocals ranged from 15.946 ton (P 4 × P 2 ) to 29.798 ton (P 4 × P 1 ) with a mean of 23.241 ton/ha.

Genetic Variability.
Te pertinent of variance components in addition to genotypic (GCV) and phenotypic (PCV) coefcients of variability for pod yield traits are presented in Table 1.Data revealed that the magnitude of  PH: plant height (cm), NB: no. of branches/plant, NN: no.nodes/plant, Flow: no. of days to fowering, PL: pods length (cm), PD: pods diameter (cm), EM: days to maturity, NS: number of seeds/pod, NP: no. of pods/ plant, APW: average pod weight (g), WSP: weight of small pods (kg/plot), WMP: weight of medium pods (kg/plot), WLP: weight of large pods (kg/ plot), and FPY: fresh pods yield (ton/ha).

4
Genetics Research phenotypic (PCV) and genotypic (GCV) coefcients of variances varied from all traits.Te highest GCV and PCV were observed for all studied traits, indicating the high potential for efective selection (Burton) [25].Small diferences were observed between GCV% and PCV% for most traits, indicating the importance of the genetic efects in controlling the inheritance of these traits.Also, most studied traits had high GCV/PCV percentage.Terefore, these traits might be more genotypically predominant and it would be possible to achieve further improvement in them.Generally, the GCV/PCV exhibited the highest percentage in the parents for medium pod weight, large pod weight, and total fresh pod yield (Table 1).Te heritable portion of the variance supplies the basis for plant breeders to select from phenotypic performances.Broad sense heritability based on Stanfeld [22] was high for each of all studied traits in parents.High heritability indicated rapidly progress through selection for these traits.Tese results indicated that the environmental factors had a small efect on the inheritance of such traits.Terefore, the selection, based on mean, would be successful in improving these traits.Te genotypes displayed considerable genetic advance in most traits.Genetic advance based on [21] was high for each of plant height, nodes number/plant, no. of pods/plant, and no. of seeds/ plant (Table 1).Generally, high heritability was obtained for all traits along with high genetic advance as percent of the mean (GAM%).

Genetic Components and Derived Parameters.
As shown in Table 3, additive genetic component (D) was signifcant in all studied traits except average pod weight.
Nonadditive (H 1 and H 2 ) components were found to be signifcant in all studied traits.However, the values of dominant efect (H 1 ) were smaller than D components for no. of nodes/plant, no. of pods/plant, weight of medium pods, weight of large pods, and total fresh pod yield.Moreover, estimates of H 2 , which represent the mean dominant efect of the parents, were smaller than H 1 for all studied traits.
Tis indicates that the frequencies of positive and negative alleles at the loci governing these traits were not equally distributed among parental genotypes.Tis result confrms those of H 2 /4H 1 which deviated from its theoretical value of 0.25 in all studied traits except number of pods.Te value (H 1 /D) 1/2 was more than unity for most studied traits indicating the presence of overdominance.Te ratio of additive genetic portion to the phenotypic genetic variance as indicated by heritability in narrow sense (h 2 n) was high and amounted to be 77% for no. of nodes/plant, 70.8% for total fresh pods, 69.5% for no. of pods/plant, and 0.58.7% for no. of days to fowering.On the other hand, h 2 n values were moderate for weight of large pods (54.2%), weight of medium pods (53.2%), and early maturity (41.5%).However, the estimates of narrow sense heritability were low and valued 26.5% (pods diameter), 26.1% (number of seeds/pods), and 16.4% (small pods weight), hereby selection was difcult and should be delayed to later segregating generations.

Types of Heterosis.
Heterosis for fowering date (Table 4) varied from −4.3% to 7.7% when both types of heterosis are considered.Desirable negative MP heterosis was observed in only one F 1 straight cross and four reciprocal crosses, while only one F 1 straight exhibited desirable BP heterosis.For plant height, the extent of variation was from −14.2% to 39.4% for both types of heterosis (Table 4) with 11 and 8 crosses showing positive MP and BP heterosis, respectively, whereas 1 and 4 crosses showing negative MP and BP heterosis, respectively.However, the important direction of heterosis for this trait either in positive or negative is depending on the breeder's point of view in respect to produce short or tall types.Heterosis values for 6 F 1 hybrids and its reciprocals of number of branches are shown in Table 4.A wide range of heterosis values was existed, namely, from −21.5% to 26.2% over to midparent and from −24.6% to 20.1% over to high respective parents.Desirable positive MP heterosis was observed in 3 F 1 straight crosses and 3 reciprocal crosses, while 2 straight and 3 reciprocal F 1 crosses showed BP desirable heterosis.None of the crosses showed signifcant positive value for nodes number in any type of heterosis (Table 4).Te absence of heterosis in this trait might be due to the lower magnitude of the nonadditive type of gene action.Te magnitude of signifcant positive heterosis for number of pods/plant was up to 48.8% over MP and 38.4% over BP.Out of 12 studied crosses (straight and reciprocals), 7 over MP and 8 over BP showed signifcant positive heterosis for number of pods/plant.Te extent of variation for average pod weight was from −24.6% to 61.2% for both types of heterosis (Table 4), with 10 crosses showing a signifcant positive MP and BP heterosis, respectively.Signifcant positive heterosis for pod length and pod diameter up to 1.6% and 3.4% over MP, respectively, was recorded.Out of all studied crosses, 2 over MP showed signifcant positive heterosis for each trait, whereas none of the crosses showed positive BP heterosis for both traits.Te heterotic expression for number of seeds per plant varied from −17.9% to 35% for both types of heterosis, and eight crosses showed MP and BP heterosis.Heterosis for early maturity date (Table 2) varied from −9.1% to 5.5% when both types of heterosis are considered.Desirable negative MP heterosis was observed in 2 F 1 straight crosses and three reciprocal crosses, while only one F 1 straight cross exhibited desirable BP heterosis.Te heterotic expression for weight of small, medium, and large pod traits varied with values ranging from −38.5% to 125.7% (WSP), −1.4% to 120.2% (WMP), and 1.6% to 149.9% (WLP) for both types of heterosis with 10, 12, and 11 crosses exhibiting signifcant positive MP and 9, 10, and 10 crosses exhibiting signifcant positive BP heterosis for WSP, WMP, and WLP traits, respectively.Heterosis of total fresh pod yield expressed as the percentage deviation of F 1 mean performance from MP and BP is presented in Table 4. Estimates of the 2 types of heterosis varied between −27.6% and 136.3%.Ten out of the 12 crosses showed signifcant positive MP heterosis and 10 crosses for BP heterosis.Generally, the best cross of each trait (due to the mean per se) and its heterosis and other related traits are shown in Tables 2 and 5.

Discussion
Te pertinent of variance components in addition to genotypic (GCV) and phenotypic (PCV) coefcients of variability for pod yield traits were calculated.Te highest GCV and PCV were observed for all studied traits in the three generations, indicating the high potential for efective selection [26].Small diferences were observed between GCV % and PCV% at the three generations for most traits, indicating the importance of the genetic efects in controlling the inheritance of these traits, i.e., NB, Flow, PL, PD, EM, APW, WSP, WLP, and FPY.Also, PH, NN, Flow, PL, PD, NS, NP, and WSP had high GCV/PCV percentage in all the three generations.Broad sense heritabilities based on [27] were high for each of all studied traits in parents, F 1 straight, and F 1 reciprocals.High heritability indicated rapid progress through selection for these traits.Tese results indicated that the environmental factors had a small efect on the inheritance of such traits.Terefore, the selection, based on mean, would be successful in improving these traits.Te genotypes displayed considerable genetic advance in most traits.Generally, high heritability was obtained for all traits along with high genetic advance as percent of the mean (GAM %) in most cases.Terefore, selection for these characters would be more efective because it has high heritability and genetic advance% [28].On the basis of the results obtained in the present study, it can be concluded that the range of variability was quite considerable for most studied characters among diferent genotypes.Tese results are in agreement partially with those obtained by [29][30][31][32].
To separate out the components of genetic variance and their ratios for all studied traits, the data were further Genetics Research subjected to the diallel analysis proposed by [17], although the F 1 data do not entirely obey the simple additivity/ dominance model in some traits where the authors in [17,32] stated that it is possible to make estimates of parameters of genetic components even in case of partial failure of the diallel assumptions.Te value (H 1 /D) 1/2 was more than unity for most studied traits indicating the presence of overdominance.Te estimates of narrow sense heritability were low and valued 26.5% (pods diameter), 26.1% (no. of seeds/pods), and 16.4% (small pods weight), hereby selection was difcult and should be delayed to later segregating generations.Tese results are in harmony with those obtained by [26][27][28][29][30][31][32].
Te heterotic expression for weight of small, medium, and large pod traits varied with diferent values for all types of heterosis.Estimates of the two types of heterosis exhibited total fresh pod yield varied between −27.6% and 136.3%.Ten out of the 12 crosses showed signifcant positive MP heterosis and 10 crosses for BP heterosis.Similar magnitude of heterosis was also reported by [13,[33][34][35][36][37][38][39].Te best crosses, which were classifed on the basis of heterosis parameters, showed that two out of the 12 studied crosses were derived from P 4 (Line 4.1.18)as male or female parent that was classifed as a good performance for plant height, no. of pods/plant, average weight of pod, total fresh pods, weight of small pods/plot, pods length, pods diameter, and weight of medium pods.Terefore, this parent (Line 4.1.18)could be used as promising progenitors for the abovementioned traits in genetic improvements by means of selection in segregating generations.Te frst cross (Egyptian Balady cv × Line 4.1.18)exhibited the highest mean yield, average pod weight, WSP, WMP, and WLP.It also showed highly signifcant desirable heterotic efects for seven important traits, viz., NS, NP, APW, WSP, WMP, WLP, and FPY.Again, the results reveal that the cross Egyptian Balady cv × Line 4.1.18can be considered the best combination among the 12 crosses evaluated in the present work.Te another best cross, namely, (Line 4.1.18× Egyptian Balady cv) showed high mean fruit yield/plant (29.798 ton/ha) and highly signifcant heterotic efects for at least six important yield contributing traits.Terefore, the abovementioned cross combinations are promising for genetic improvement either for yield or some of its important components through heterosis and/or selection in the segregating generations to exploit a fxable additive gene action.

Conclusions
Parent (Line 4.1.18)could be used as promising progenitors for plant height, no. of pods/plant, average weight of pod, total fresh pods, weight of small pods/plot, pods length, pods diameter, and weight of medium pods traits in genetic improvements by means of selection in segregating generations.Te two cross combinations (Egyptian Balady cv × Line 4.1.18F 1s and its reciprocal F 1r ) are promising for genetic improvement either for yield or some of its important components through heterosis and/or selection in the segregating generations to exploit a fxable additive gene action.

Figure 1 :
Figure 1: Day and night temperatures and the diference between them prevailing at Al-Kharj Governorate throughout the year (average 2019-2020).

Table 1
Te mean of four parents values for number of nodes/plant is 4.45 ( 1 straight hybrids ranged from 53.8 to 59.8 days with a mean of 57.1 days.Te mean value of fowering date of 6 reciprocal crosses is 56.2 days with a range from 54.1 to 59.8 days.Te ranking of parental genotypes is as follows: P 2 (earliest) and P 3 (no signifcant diferences between them) and both P 4 and P 1 (latest).In general, it could be noticed that P 2 and the F 1 straight hybrid P 1 × P 3 and the reciprocal hybrid P 2 × P 1 behaved as the earliest genotypes.Te parental performance for pod length (Table

Table 1 :
Range of parents, F 1 straight (F 1s ), and reciprocal (F 1r ) mean performance as well as the genetic parameters at parents.

Table 2 :
Te best cross of each trait and its heterosis and other related traits (due to the mean).

Table 3 :
Genetic components and derived parameters for all studied okra traits.