摘要：Development of new high yield wheat varieties is the main objective of the wheat improvement program. The information concerning the genetic variability, heritability and correlation analysis for different parameters is indispensable to propose effective wheat breeding program. (Table 1) which exhibited that genotypes performance variable for all the traits. A field experiment was carried out during 2016-17 in Randomized Complete Block Design (RCBD) with three replication and ten genotypes. The mean squares from analysis of variance revealed that all genotypes were significant difference at 1% probability level. NIA Sarang (mutant) recorded maximum mean performance for days to 50% heading (70.00 days), peduncle length (41.50cm) and seed index (50.00g) and next scorer for the days to 90% maturity (129.83) and spike length (13.33cm), While NIA Amber (mutant) showed longer spike length (15.33cm) more number of spikelet spike (24.33), more number of grains spike~(-1) (71.00 seeds), higher biological yield (49.00 g) and next ranked for days to 50% heading (67.00), tiller plant~(-1) (10.67), plant height (87.37cm) and grain yield plant~(-1) (25.33g), while TD~(-1) (check variety) recorded minimum (117.00 days) in 90% maturity, plant height (59.67cm), peduncle length (30.33cm) and maximum (11.33) tillers plant~(-1), grain yield plant~(-1) (25.67g) and harvest index (53.47%). The high her- itability (h~2b.s.%) were recorded for days to 50% heading (h~2 = 97.16%), days to 90% maturity (h~2 = 95.60%), tillers plant~(-1) (h~2 = 91.83%), plant height (h~2 = 99.08%), peduncle length (h~2 = 93.05%), spike length (h~2 = 93.05%), spikelets spike~(-1)(h~2 = 95.17%), grains spike~(-1)(h~2 = 96.02%) , grain yield plant~(-1)(h~2 = 98.40%), biological yield plant~(-1) (h~2 = 97.17%), seed index (h~2 = 89.09%) and harvest index (h~2 = 93.27%). Correlation coefficient showed that significant and positive associations of spike length, spike- lets spike~(-1), grains spike~(-1), biological yield and harvest index with grain yield plant~(-1). Regression analysis showed that a unit increase in spike length, spikelets spike~(-1), grains spike~(-1), biological yield and harvest index will simultaneously increase grain yield plant~(-1). Days to 90% maturity and plant height showed significant but negative association with harvest index. The regression analysis indicated that a unit increases in days to maturity and plant height cause reduction in harvest index. The present results indicated that Mutants NIA Sarang and NIA Amber could be used for developing new wheat varieties with improved yield traits with early maturity through simple selection from later generations.
