Changes in Leaf Stomatal Properties in Rice with the Growing Season  

作　　者：Jiana Chen Fangbo Cao Min Huang 

机构地区：[1]Rice and Product Ecophysiology,Key Laboratory of Ministry of Education for Crop Physiology and Molecular Biology,Hunan Agricultural University,Changsha,410128,China [2]National Engineering Research Center of Rice,Hunan Agricultural University,Changsha,410128,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第4期807-817,共11页国际实验植物学杂志（英文）

基　　金：the Science and Technology Innovation Program of Hunan Province(Grant No.2021RC3088);the Hunan Provincial Natural Science Foundation of China(Grant No.2023JJ40309);the National Natural Science Foundation of China(Grant No.32001470).

摘　　要：Transplanting rice varieties grown in different seasons can lead to different yields due to different dry matterproduction. Early-season rice varieties transplanted in the late season can obtain high yields with short-growthduration and higher yields driven by higher dry matter production. To make clear the variations in dry matterproduction across seasons, four early-season rice varieties were chosen for late-season transplantation. The grainyield, dry matter accumulation, leaf photosynthetic, and leaf stomatal properties were studied. It was observedthat the average yields of these four varieties in the late season were 33% greater, despite a reduced growth periodof 13 days in comparison with the early season. Furthermore, there was a notable increase in both total and postheadingdry matter production during the late season. The leaf net photosynthetic rate, stomatal area, stomatalwidth, and stomatal length were higher in the late season. Despite no significant difference in stomatal densitybetween seasons, strong positive linear relationships were observed between net photosynthetic rate and stomatalconductance, and between stomatal conductance and area. These relationships demonstrate that the increase ofthe stomatal width and length of the leaves in the late season leads to an increase in the stomatal area, therebyincreasing the stomatal conductance and enhancing the photosynthesis of the leaves. Consequently, this leads togreater dry matter production and a higher yield compared to the early season. Therefore, when breeding newhigh-yielding and short-growing varieties, the large stomatal area can be used as a reference index.

关 键 词：PHOTOSYNTHESIS RICE stomatal properties SEASON yield 

分 类 号：S511[农业科学—作物学]