SELECTION OF LOCAL OKRA (Abelmoschus esculentus L.) GENOTYPES FOR STABILITY UNDER SALINE CONDITIONS

Abstract

This investigation aimed to observe genotypic stability (with respect to pods yield) of thirteen local okra genotypes across three locations: Kaha Horticulture Research Station, Kaluobia Governorate, Experimental Farm of the Desert Research Center at Ras Sudr, South Sinai Governorate location 1,2 (both salinity condition). In addition to group, the genotypes having similar response pattern over all environments. Moreover, studying the effect of salinity conditions on plant growth performance. Multienvironmental trials (MET), generally, have significant main effects and significant multiplicative genotype x environment interaction effect. AMMI (Additive main effect and multiplicative interaction analysis) offers a more appropriate statistical analysis to deal with such situations, compared to traditional methods like ANOVA, PCA and Linear regression.The results showed that (I) the obtained results satisfied one of the breeder's goals for selecting the best-suited genotype for cultivation in a wide salinity range of environments; (II) the analysis of variance of thirteen local okra genotypes in three locations (Kaha, Ras sudr 1 and Ras sudr 2) shows that genotype (G), environment (E) and their interaction were significante (P<0.01) for genotype; (III) the AMMI model was very effective for studying GEI interaction, the first bilinear AMMI (IPCA1) model terms accounted for 71.268%; (IV) no genotype has superiority performance in under all studied environments; although, the biplot shows that the genotypes BG9, BG6, BR27 and BR20 are best-suited for cultivation in a wide range of environments; (V) the salt stress has affected the Okra plant growth and development.