تحري التفوق و قوة الهجين و التدهور الناتج عن التربية الذاتية لمؤشرات الباكورية في البازلاء الخضراء (Pisum sativum L.)‎

Abstract EN

This research was conducted at Dara,a Research Center, General Commission for Scientific Agricultural Research, (G.C.S.A.R.) (Syria) during three growing seasons (2007/2008, 2008/2009 and 2009/2010) to detect genetic behavior, heterosis in F1 and inbreeding depression in F2 of earliness parameters in garden peas namely: days to beginning of flowering, days to beginning of marketable maturity, number of low internodes, internodes length through utilizing generation mean analysis test in a randomized complete block design with four replications, using four parental genotypes (Mutant-3, Dasargelo, Oterlo and Nassra) where half-diallel crossing scheme 4x4 was applied and then production of F1, F2, F3, BC1 and BC2 geneerations for all crosses.

Test of significance showed significant differences among hybrid populations for all studied parameters, except number of low internodes in the Oterlo x Nassra cross and internodes length in the Mutant-3 x Oterlo, Mutant-3 x Nassra and Oterlo x Nassra crosses suggesting to excluded from further genetic analysis.

The highest negative significant values of heterosis for days to beginning of flowering and marketable maturity were recorded in Mutant-3 x Oterlo and Mutant-3 x Nassra crosses (-23.48 , -13.07% respectively) for the first parameter and (-19.44 , -16.81 % respectively) for the second parameter , and significant inbreeding depression in F2 in the same direction has been observed in most crosses for all characters, which were relattively low, due to the nature of self-pollination of peas crop.

Generation mean analysis revealed participation of all types of gene action in the inheritance of earliness parameters in most crosses, and predominance of duplicate type of epistasis (dominance x dominance), suggesting the utilization of reciprocal recurrent selecttion method as an efficient breeding procedure