Inheritance of hardseededness in soybean [Glycine max (L.) Merril]
1982
Rungsarid Kaveeta
Six soybean lines were crossed in a diallel manner. The f1's and f1-reciprocals were grown to study an inheritance of hardseededness as well as 10 other agronomic traits; namely, days to first flowering, days to last flowering, days to harvesting, plant height, number of branches per plant, number of pods per plant, number of seeds per pod, 100 seeds weight, seed yield per plant and seed moisture content. The analysis of variance showed the genetic differences of these lines for all traits except number of seeds per pod. In addition, seed moisture content is believed to be the result of variability in hardseededness and no genetic analyses were done for this 2 traits. Thus 9 traits were finally analysed for variation in combining abilities. The variances due to g.c.a. among the lines were statistically significant for all 9 traits. The variances due to s.c.a. were also significant in 7 traits except number of seeds per pod and seed yield per plant. Variances due to reciprocal effects were statistically significant for hardseededness, days to first flowering, days to last flowering, plant height, and number of pods per plant. The g.c.a. components were larger than those of the s.c.a. for all traits except average bean hour, with the ratio of 0.02 to 1.0. Combining abilities of average bean hour and yield components indicated that D67-5677-1 and D65-8232 were the better hard-seeded parents, whereas BM-33 and SJ4 were the better normal-seeded parents
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