Development of Okra (Abelmoschus esculentus L. Moench) Hybrids Derived from Selected Inbreds under Drought Stress

Abstract

Due to the increased water shortage and frequent drought in Egypt, it is essential to develop droughttolerant plants. Therefore, five drought tolerance lines of okra were used to develop superior hybrids under drought conditions, using a half-diallel mating design to produce fifteen hybrids. There were significant differences among the hybrids and their parents in mean squares for all studied traits. The hybrids (P 2 XP 6 ), (P 2 XP 3 ), (P 1 XP 2 ) and (P 2 XP 4 ) exhibited the maximum mid-parents (MP) and better parent (BP) heterosis for total yield/plant.The mean squares for general (GCA) and specific combining abilities (SCA) were significant for studied traits, which indicates the importance of additive and non-additive gene actions in the inheritance of the studied traits in okra.The magnitudes of additive genetic variance (σ 2 A) were larger than their corresponding non-additive genetic variance (σ 2 D) for plant height, number of branches per plant, number of days to 50% flowering, pod length and total yield/plant. This revealed the major effect of additive inheritance for these traits.Genetic analysis illustrated that broad sense heritability (h 2 bs %) values were larger than their corresponding heritability in narrow sense(h 2 ns %) for all studied characters.As for the correlations between yield component traits, there were significant and positive genotypic correlation (r g ) among total yield/plant and plant height, average pod weight and number of pods/plant. Overall, these crosses are promising hybrids with high yielding ability, and could be commercially recommended to improve economical traits in okra under drought conditions.

Combining Ability and Genetic Analysis of Morphological and Yield Related Traits in Abelmoschus esculentus L.

“…The ratio of GCA/SCA variance was found to be less than unity (0.052) due to the observation of higher SCA variance than GCA variance, indicating the preponderance of non-additive gene activity (Abinaya et al, 2020). In contrast to our findings (Abed et al, 2020) demonstrated that the additive genetic variance's was higher for the number of days till flowering. Mean values for these parameters are shown in Table 3.…”

Target-Based Physiological Modulations and Chloroplast Proteome Reveals a Drought Resilient Rootstock in Okra (Abelmoschus esculentus) Genotypes

“…Compared with the control group, there was little down-regulation in the proteins under drought stress. Although the majority of studies have reported on the morpho-physiological and biochemical activities of the okra plants under drought stress [ 83 , 84 , 85 , 86 ], this was the first attempt to report on the sensitivity of photosystems in okra plants under drought stress. In order to confirm our chloroplast proteomic results, western blot was followed up after BN-PAGE to study the expression of photosystem PsaA ( Figure 13 ).…”

Production of Open Field New F1 Hybrids Squash (Cucurbita pepo L.) under Egyptian Conditions

“…Significant differences were noticed between crosses and lines, the observed genetic variability between the accessions were mostly contributed by the aforementioned traits which reported by El-Tahawey et al (2015); Marxmathi et al (2018) andAbd El-Hadi et al (2020). Wide genetic variations between the accessions are required for effective selection program (Abed et al, 2020). Part of the genetic variance to its components could be made during the analysis of the partial diallel mating design.…”