Water relations composition among Egyptian cotton genotypes under water deficit

Background: water shortage is one of the major factor effects on growth characters and yield most crops. Objective: this study was conducted to get know reactions some Egyptian cotton genotypes deficit. Methods: The genetic materials used in included thirteen belonging Gossypium barbadense L., from Cotton Research Institute (CRI), which devoted establishing experimental for investigation. Results: ratio GCA/SCA less than unity all studied indices, indicating predominance non-additive gene action (dominance epistasis), an important exploitation heterosis through hybrid breeding. data showed significant reduction relationship parental under stress conditions. variety Giza 68 gave high values characters. Data revealed that greater value tolerance index is, larger deficit conditions higher sensitivity becoming. 96 highest At same time, cross combination Minufy x Australy followed by combinations 67 Australy. Of male parents, Russian genotype 10229 recorded best GCA female old exhibited good general combined 86 Pima S6, 77 94 Dandra desirable SCA effect Conclusion: relative content %, osmotic pressure, chlorophyll carotenoids indicates better availability cell, increases photosynthetic rate. Also, level proline accumulation leaves suggests production probably a common response plant