قوة الهجين وقدرة الائتلاف والفعل الجيني باستخدام تحليل السلالة × الفاحص في الذرة الصفراء - محافظة الانبار

Field experimentwas conductedat field ofFallujah-Anbar Governorate/ Iraq,duringthe two seasons of2017.Seeds of eight maizeinbred lineswere cultivated,and line×testermethod was usedto produce 16crosses.The seeds of parents were cultivatedand crosses in the fallseasonof2017in a randomized complete block designwiththree replicates. The objectives of the study were to estimategene action, hybrid vigour, and the effects of generaland specific combination abilitiesof the inbred lines and to evaluate test cross performance of the hybrids forgrain yields and yield related traits.There weresignificant differences between parents and their crossesfor all studied traits. The results showed that crosses(ZM12 x ZM51W) and (ZM12 x ZM43W) gave the highesthybrid vigouringrain yield (39.32% and 31.62% respectively)to the bestparents. Thetwocrossesalsoweresuperiorinthe plant grain yield (222.29 and 217.15 gm.plant-1).Thespecific combination ability componentswere larger than the general combination ability components. The dominance genetic variation was more important than the genetic variation additive. The heritability in its narrow sensewas low ranging between 2.17% for grain yield.plant-1and 25% for Leafarea,andthisled to a high degree of dominanceontheonefor all the studied traitsexcept leaf area.It can be concludedthat it is possible to use some parentswhich outperformed othersof crosses,because most oftraitswere under the influence of dominant and over dominant gene effects