期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 72, 期 4, 页码 1282-1294出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa520
关键词
Atmospheric change; crop improvement; flag leaves; food security; natural variation; photosynthetic induction; rice; rice breeding; Rubisco activation; water use efficiency
资金
- project Realizing Increased Photosynthetic Efficiency (RIPE) - Bill & Melinda Gates Foundation
- Foundation for Food and Agriculture Research (FFAR)
- UK Department Foreign, Commonwealth and Development Office [OPP1172157]
- U.S. Borlaug Fellows in Global Food Security Fellowship
- Office of International Programs (OIP) in the College of Agricultural, Consumer, and Environmental Sciences (ACES) at the University of Illinois at Urbana-Champaign
- C4 Rice Center
Research shows that there is significant variation in photosynthesis of rice flag leaves under steady and non-steady-state conditions, with no significant correlation between the two. Additionally, the photosynthetic traits of flag leaves do not directly correlate with those of leaves in the vegetative growth stage.
Several breeding initiatives have sought to improve flag leaf performance as its health and physiology are closely correlated to rice yield. Previous studies have described natural variation of photosynthesis for flag leaves; however, none has examined their performance under the non-steady-state conditions that prevail in crop fields. Photosynthetic induction is the transient response of photosynthesis to a change from low to high light. Rice flag leaf photosynthesis was measured in both steady- and non-steady-state conditions to characterize natural variation. Between the lowest and highest performing accession, there was a 152% difference for average CO2 assimilation during induction ((A) over bar (300)), a 77% difference for average intrinsic water use efficiency during induction (iWUE(avg)), and a 185% difference for the speed of induction (IT50), indicating plentiful variation. No significant correlation was found between steady- and non-steady-state photosynthetic traits. Additionally, measures of neither steady-state nor non-steady-state photosynthesis of flag leaves correlated with the same measures of leaves in the vegetative growth stage, with the exception of iWUE(avg). Photosynthetic induction was measured at six [CO2], to determine biochemical and diffusive limitations to photosynthesis in vivo. Photosynthetic induction in rice flag leaves was limited primarily by biochemistry.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据