TESTING INTRODUCED MAIZE GERMPLASM BY LINE X TESTER METHOD 1- Yield and Yield Component

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20/10/2014 11:02 AM

TESTING INTRODUCED MAIZE GERMPLASM BY LINE X TESTER METHOD 1- Yield and Yield Component


 
K.M. Wuhaib/ Dept. Of Field Crops Sci. - Coll. Of Agric - Univ.of Baghdad


ABSTRACT


A field experiment was conducted at the field of Field Crops Sci. Dept., College of Agric. / Univ. of Baghdad. Ten introduced maize (Zea mays L.) inbreds lines from Italy were tested in Iraqi central region. Inbreds were tested for general and specific combining ability by using line x tester mating method. Inbreds were planted in spring and fall seasons /2009. Selfing was used to increase homozygosity. In spring season / 2010 seeds were planted, and at anthesis crossing between inbreds and tester was done. In fall season /2010 varietal trial for crosses and parents were conducted by using RCBD with four replications to evaluate crosses and parents and to estimate some genetic parameters. Statistical analysis revealed highly significant increases for all traits, no. of grain /row, no. of grain /plant, grain weight, dry weight /plant and grain yield. The genetic analysis show that inbred L3 was superior and gave high grain yield (121.59 g) because it gave high dry weight (248.6 g) ,no. of grain /plant(468.3 g) , no. of grain /row(38 grain), also it had positive gca . The cross L1 x t8 was superior and gave highest yield (173.7 g) because of its superiority in dry weight (355.14 g) ,no. of grain /plant(672 grain) , no. of grain /row (37 grain). It also had highest positive hybrid vigor for grain yields (98.61 g), sca (18.976). The value of additive variation for inbred was more than tester for all the traits. This means that selection can be used for several traits of better inbred to produce synthetic or hybrid cultivars. The dominant gene action for inbred was lower than additive, but it was close to additive variation for testers. σ2 gca and genetic variation for inbreds were superior than testers for most traits. The average degree of dominance was more than one except grain weight was less than one. The conclusion from these data was: some of inbreds were superior in general and specific combining ability; therefore it can be used in hybrid or synthetic production



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