GENETIC VARIATION AND INTERRELATIONSHIP OF AGRONOMIC TRAITS IN INTERSPECIFIC DERIVATIVES OF DURUM WHEAT (TRITICUM DURUM DESF.)

摘要

Ninety-seven durum derivatives along with thirteen parents representing T. durum, T. aestivum and T. turgidum species were evaluated for grain yield and yield - related traits Considerable variability was found for all character among the genotypes. Mean values of derivatives had higher values compared to the parents for almost all the characters. The maximum range was observed for harvest index (3-45 %). while day to maturity had the least range (117-136). The highest coefficient of variation (CV%)was exhibited by number of productive tillers per plant. GCVs and PCvs were almost of the same magnitude for sedimentation value, thousand grain weight and days to flowering. Broad sense heritability values were also high for these character indicating apossibility of improving such traits through selection. Desirable associations were observed among productive tillers/plant, number of grains/spike, thousand-grain weight, biological yield and harvest index. However, grain yield had a highly significantnegative genotypic correlation with protein content (r=-0.59) and a weak association with sedimentation values (r=0.03, r=0.02. r=0.10). Path analysis of drum derivatives revealed that biological yield/plant and thousand-grain weight are the most important attributes influencing grain yield.