Enhancing leaf photosynthesis from altered chlorophyll content requires optimal partitioning of nitrogen

被引：23

作者：

Zhou, Zhenxiang ^{[1
]}

Struik, Paul C. ^{[1
]}

Gu, Junfei ^{[2
]}

van der Putten, Peter E. L. ^{[1
]}

Wang, Zhiqin ^{[2
]}

Yin, Xinyou ^{[1
]}

Yang, Jianchang ^{[2
]}

机构：

[1] Wageningen Univ & Res, Ctr Crop Syst Anal, Dept Plant Sci, POB 430, NL-6700 AK Wageningen, Netherlands

[2] Yangzhou Univ, Coll Agr, 48 Wenhui East Rd, Yangzhou 225009, Jiangsu, Peoples R China

来源：

CROP AND ENVIRONMENT | 2023年 / 2卷 / 01期

关键词：

Chlorophyll content; Light energy utilisation efficiency; Nitrogen partitioning; Non-photochemical quenching; Oryza sativa; Photosynthetic capacity; SOLAR-ENERGY CONVERSION; ANTENNA SIZE; TRITICUM-AESTIVUM; XANTHOPHYLL CYCLE; PHOTOSYSTEM-II; QUANTUM YIELD; GAS-EXCHANGE; FLUORESCENCE; LIGHT; LEAVES;

D O I：

10.1016/j.crope.2023.02.001

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

While optimising leaf chlorophyll content ([CHL]) has been proposed as a relevant means to manipulate canopy light penetration and canopy photosynthesis, effects of modifying [CHL] on leaf photosynthesis are yet to be investigated thoroughly. A greenhouse experiment and a field experiment were conducted involving rice genotypes of different genetic backgrounds and their leaf-colour variants. Leaf photosynthesis was more influenced by alteration to yellow-leaf than to stay-green cases. Higher specific leaf area and stomatal conductance were observed in two yellow-leaf variants, while only one yellow-leaf variant showed significantly increased Rubisco carboxylation capacity (Vcmax), maximum electron transport rate (Jmax), and photosynthetic nitrogen-use efficiency (PNUE). Model analysis indicated that reducing leaf [CHL] decreased the energy loss via nonphotochemical quenching, but improving Vcmax, Jmax, and PNUE would require an improved nitrogen distribution pattern within the leaf. Label-free quantitative proteomics confirmed that an increased investment of nitrogen in Cyt b6/f and Rubisco was observed in the yellow-leaf variant of the genetic background with improved Vcmax, Jmax, and PNUE, but not in the other background. Our results suggest that reducing [CHL] can improve leaf photosynthesis only if the saved nitrogen is optimally distributed to proteins that are more rate-limiting to photosynthesis.

引用

页码：24 / 36

页数：13

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