Factors Affecting the Yearly Fluctuation in the Culm Length of Rice(Agronomy)
Factors Affecting the Yearly Fluctuation in the Culm Length of Rice(Agronomy)
复制标题
影响水稻秆长年际波动的因素（农学）
DOI：
10.1626/jcs.70.489
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Y. Shibata
中科院分区：
文献类型：
--
作者：
R. Sasaki;T. Horie;K. Toriyama;Y. Shibata
1988 ~ 1994年，在相同的施肥管理措施下，在稻田中栽培了三个水稻品种，越光、越智濑和鬼光，并研究了影响水稻秆长年度波动的因素。3个品种成熟期秆长与颈节分化期叶面积指数呈显著正相关。成熟期下部节间长度与NNDS下叶面积指数呈显著正相关，说明成熟期下部节间长度与NNDS下叶面积指数呈显著正相关。在NNDS条件下，秆长对叶面积指数的回归系数存在品种间差异，短秆品种鬼光的回归系数为5.3cm/LAI，越光和越植的回归系数分别为11.4和16.1cm/LAI。这表明，下部节间和秆的伸长对高LAI的敏感性低于Koshihikari和Koshijiwase。NNDS的SPAD值与平静时间呈正相关。然而，Kinuhikari的相关系数低于Koshihikari和Koshijiwase。NNDS的LAT与洪水前一个月的降水量呈负相关。这些结果表明，在NNDS的LAT的年度波动的影响，空气干燥的氨化作用，从而导致秆长的年度波动发生。
Three rice cultivars, Koshihikari, Koshijiwase, and Kinuhikari, were cultivated in a paddy field under similar fertilizer management practices from 1988 to 1994, and factors affecting the yearly fluctuations in the culm lengths of rice were examined. The culm lengths at the ripening stage were positively correlated with the leaf area indexes (LAI) at the neck node differentiation stage (NNDS) in the three cultivars. The longer lengths of culm were explained by the positive correlation between the lengths of lower internodes at ripening stage and LAI at NNDS. The varietal difference in the regression coefficient of culm length to LAI at NNDS was observed; the coefficient of Kinuhikari, which is a short culm variety, was 5.3 cm/LAI, and those of Koshihikari and Koshijiwase were 11.4 and 16.1 cm/LAI, respectively. This suggests that the sensitivity of elongation of lower internodes and culm to high LAI was lower for Kinuhikari than for Koshihikari and Koshijiwase. The SPAD values at NNDS were positively correlated with the calm length. However, the correlation coefficient was lower for Kinuhikari than for Koshihikari and Koshijiwase. The LAT at NNDS showed negative correlation with the amount of precipitation during the month before flooding. These results indicated that the yearly fluctuation of LAT at NNDS was affected by the air-drying effect on ammonification, which caused the yearly fluctuations of culm length to occur.