GENETIC PARAMETERS FORSOME IMPORTANT CHARACTERS IN ALFALFA (Medicago Sativa L.) CROSS
Abstract: The assessment of gene effect for some vegetative, fertility traits and detection of epistasis in alfalfa was studied in a cross between New valley and Ismaelia-94 genotypes through six generations mean analysis during three successive seasons from 2011/12 till 2013/14 at the Experimental Farm of the Forage Research Department, Field Crops Research Institute, Agriculture Research Center, Giza, Egypt. The nature of gene effects for agronomic and fertility traits were analyzed through six generations for detecting the gene effects responsible for inheritance. Significant differences were detected among generations viz, P1, P2, F1, F2, BC1 and BC2 for most of the studied traits. F2 generation indicated better performance for number of tiller and fresh yield (32.63 and 93.99, respectively). Bc1 generation recorded the best values among number of pods tiller-1 and number of seed tiller-1 with (51.87 and 156.73). F2 mean performance was greater than the better parents for all traits except number of inflorescences plant-1 and 1000-seed weight. Bc1 recorded the best average mean across the most of agronomic and fertility traits. Broad sense heritability (H2b) recorded high values of plant height, No tillers and fresh yield (0.845, 0.941 and 0.878, respectively), while leaf stem ratio and dry yield were low values of H2b (0.420 and 0.290, respectively). So, H2b ranged from 0.520 for the number of florets inflorescence to 0.972 for the number of inflorescences plant-1) respectively, whereas the narrow sense heritability (h2n) illustrated low values across agronomic and fertility traits. The estimated values of additive variance (d) for the most of studied traits recorded highly significant positive sign, it is revealed that both additive and dominance gene effects were important in the performance of these traits. Duplicate epistasis was prevailing for all agronomic traits and number of inflorescence plant-1 except for leaf stem ratio%. Complimentary epistasis of non-allelic gene interaction was showed only for number of pods plant-1.
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Publication year 2015
Pages 273-286
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Author(s) from ARC
Publication Type Conference/Workshop
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