0023-6152

AA00697606

24246

査読無

0023-6152

AA00697606

This study was carried out to develop a useful method for selection of promising cultivars for direct seeding cultivation based on the development of root system analysis, To select culrivars at the early stage for root system with lodging resistance, transparent polyethylene seed pack growth pouch (SPGP) was used. Among the root parameters of SPGP seedlings, only root thickness of F4 lines was positively correlated with pushing resistance of field test (r=0.46**). The root thickness of SPGP also had a positive correlation with root thickness of field test (18 Days After Seeding: r=0.348*, 30 DAS : r=0.512**, respectively). Root thickness of SPGP, 18 DAS and ;30 DAS seedlings in field were positively correlated with panicle weight (r=0.336**, r=0.298*, r=0.341**, respectively). Therefore, we can also select panicle weight type by root thickness of SPGP. In path analysis, the direct effect of root thickness of SPGP on pushing resistance occupied 63% (0.289) of total coefficient of correlation (0.458). However, that of 18 DAS seedlings of field test on pushing resistance occupied only 39% (0.1255) of total correlation coefficient (0.3189), and the direct effect of 30 DAS seedings was negative. From these results we concluded that the root thickness of SPGP could he a very useful selection index for lodging resistance in direct seeding cultivation.