Gravitropic Response of Pulvini on the Elongating Stem of Rice and Their Interaction among Pulvini

Japanese Journal of Crop Science

Hiroyuki OTAKE¹  Kiyoshi TAKAHASHI¹ 

关键词: Deepwater rice;    イネ;    Gravitropic response;    浮稲;    Leaf pulvinus;    重力屈性反応;    Rice.;    葉枕.;   

DOI  :  10.1626/jcs.62.81

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Gravitropic response of each pulvinus and their interaction in rice stem was studied using deepwater cultivar, Hebiganj Aman 8 (HA) and japonica cultivar, Sasanishiki. Almost same results were obtained in both cultivars ; therefore, the results obtained with HA are indicated here. Exp. 1 : Both of intact plants and excised stem sections including three succesive pulvini responded to the gravity in almost same manner. Then we used stem sections in the following experiments. Exp. 2 : In all three pulvini, gravitropic curvature was started within a few hours after the stem sections were placed horizontally and finished their response after 42 hours. Exp. 3 : One of the pulvini in stem segment placed horizontally was physically fixed with a plastic straw to prevent the action of curvature of that pulvinus. The degree of curvature of the upper pulvinus was increased when the lower pulvinus was fixed. However, curvature of the lower pulvinus was not increased when the upper pulvinus was fixed. Exp. 4 : Each individual pulvinus was separated from the stem and again jointed with plastic straws so as to make a stem with each 5 mm spaces among the three pulvini. Then the stem was placed horizontally. Degree of the total curvature was near 90 degrees when the upper, youngest pulvinus was inserted at the uppermost position. However, the total curvature exceeded 90 degrees when the lowest, oldest pulvinus was placed at the uppermost position. In conclusion, it is shown that rice leaf pulvinus responds to gravity independently from other pulvini in an elongated stem.

【 授权许可】

Unknown