GENETIC STABILITY OF SOME WHEAT GENOTYPES UNDER FOUR VAROUS ENVIRONMENTS

Ten wheat genotypes (Triticum aestivum L.) were Evaluated for yield and its attributing characters under four environments(two locations x two seasons).The genotypes were; Sakha 93, Sakha 94, Giza 168, Sids 1, Sids4, Sids6, Sids9, Sakha61, Gemmeiza 9 and Gemmeiza 10 The mean performance, phenotypic stability and interrelationship between various characters were computed. The results indicated that, significant genotypes; genotype x environment, environmental linear and genotype x environment linear variance for all studied characters. Regression coefficient (b) deviated significantly from unity (b > 1) for genotypes, Sids 1 and Sakha 61 for plant height , Sids9 and Gemmeiza 9 for spike length  and Sids 9 for 1ooo grain weight; indicating that these genotypes were adapted to favorable environments for these characters.
                The “b” value deviated significantly from unity and was less than one (b < 1) in Sids 1, Sids 4  and Sids 9 for1000 grain weight , grain weight / spike,  and grain yield ardab / fad .  The genotypes for considering the stability parameters (C.V% and S²d accompanished with mean performance (X), the most desired and stable wheat genotypes were  Gemmeiza9  for plant height, spike grain weight and grain yield
(ard /fad), Sids 1 for spike length , grain weight/spike  . While Sakha 94 was stable for number of spikes/plant.
                Correlation coefficients values were positive and significant between yield /fad and each of all studied characters except plant height.