Studies on Lodging in Rice Plants : I. A general observation on lodged rice culms

Japanese Journal of Crop Science

Kiyochika HOSHIKAWA¹  Shan-Ben WANG¹ 

关键词: Breaking direction;    イネ;    Breaking position;    挫折位置;    Broken internode;    挫折節間;    Flattening of internode;    挫折方向;    Lodging;    節間の扁平率;    Major axis;    倒伏;    Minor axis;    短径;    Rice;    長径;   

DOI  :  10.1626/jcs.59.809

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A general observation was conducted on lodged rice culms in cultivars Sasanishiki and Koshihikari grown in paddy fields in 1986, 1987, and 1989. The shape of the cross section of internodes was observed to be not circular, but elliptical with a major and a minor axis. Flattening of internode calculated based on the difference between the major and minor axis was higher in lodged culms than in unlodged ones in the lower internodes. Values of the major and minor axis, which reflect the width of internodes, were lower in lodged culms, also, lengths of the lower internodes were longer than unlodged ones. The broken internode was found to be mainly the IV internode in Sasanishiki and IV, V internodes in Koshihikari. The breaking position in the broken internode was restricted to the portion ranging from 10 to 30% of the full internode length distant from the lower node level. This 20% portion was regarded as a breaking area of the broken internode. The breaking direction was observed to be the minor axis of the cross section of the broken internode in most cases. These results suggested that lodging occurs in limited internodes and at a specialized position and direction.

【 授权许可】

Unknown