水稻에 있어서 姉妹系統間 競合能力 比較

Comparisons of Competitive Ability in Sister Lines of Rice Plant

To investigate the oompetition effect on agronomic characters in sister lines of a cross in rice, four near isogenic lines for glabrousness and base color bred from the backcrosses of the donor parent Malagkit Sinaguing (ACgl) to the recurrent parents IR667 and IR1317 (ACGL) were grown in pure and mixed stands with different combinatioes of two lines. The competitive ability was estimated by substrate the value of pure stand from that of mixed stand in each lines. The competitive ability appeared to be different depending on the sister lines with different genotypes. The line of ACGL genotype was superior competitor and the line of ACgl genotype was inferior resulting from the positive effect of competition on yield components in ACGL genotypes and the negative effect in ACgl genotype, respectively, while the competitive effects of the both lines with Acgl and AcGL genotypes were negligible in all characters. Number of grains per panicle, grain fertility and number of panicles per hill were more competitive in this experment.