Effect of Leaf Rolling on Transpiration and Water Use Efficiency in Rice

Japanese Journal of Crop Science

Takahiro TANIMOTO¹  Ryoichi ITOH¹ 

关键词: Evaporative demand;    イネ;    Leaf rolling;    気孔伝導度;    Photosynthesis;    光合成速度;    Rice;    蒸散速度;    Stomatal conductance;    蒸発要求量;    Transpiration;    巻き葉;    Water use efficiency;    水利用効率;   

DOI  :  10.1626/jcs.69.406

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The aim of this study is to estimate the effects of leaf rolling on the transpiration, photosynthesis, dry matter production and water use efficiency(WUE), of four rice cultivars that differ in the degree of leaf rolling. Leaf rolling was assessed with a ruler as the leaf rolling rate(LRR). LRR(%)=(1-RLW/FLW))×100, where RLW and FLW were the width of the rolling and flattened leaves, respectively. Transpiration in Koshihikari, Koganemasari and Akihikari was significantly larger than in C-115, and the transpiration of C-115 was increased by unrolling of the leaves. There was a negative correlation between the transpiration and the LRR. These results suggest that the rolling of leaves inhibits transpiration. Among the leaves with the same stomatal conductance, leaves exhibiting more than 10% LRR transpirated less than those exhibiting less than 10% LRR. However, photosynthesis was not influenced by LRR. These results indicate that WUE of a single leaf is improved by a higher LRR. The LRR had no effects on stomatal conductance and leaf temperature. Therefore, it is thought that the transpiration was decreased by leaf rolling through the decrease in the boundary-layer conductance. Comparable to the WUE of a single leaf, WUE per plant was improved by increasing LRR. Transpiration in normal C-115 was significantly increased by the unrolling of leaves. The dry matter in normal and the leaf-unrolled C-115, however, was not different until 20 days after heading, showing that WUE of normal C-115 was larger than that of the leaf-norolled C-115. WUE was decreased by evaporative demand in all cultivars and the unrolled C-115. Under the same evaporative demand, however, WUE of C-115 was larger than that of other cultivars.

【 授权许可】

Unknown