Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply

Abstract Understanding the mechanisms underlying variations in carbon isotope discrimination (Δ) in C4 plants is critical for predicting the C3/C4 ratio in C3/C4 mixed grassland. The value of Δ is determined by bundle sheath leakiness (Ф) and the ratio of intercellular to ambient CO2 concentration (...

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Autores principales:	Hao Yang, Qiang Yu, Wen-ping Sheng, Sheng-gong Li, Jing Tian
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c82fc060146646478d7b2326ee675af2
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spelling	oai:doaj.org-article:c82fc060146646478d7b2326ee675af22021-12-02T11:53:08ZDetermination of leaf carbon isotope discrimination in C4 plants under variable N and water supply10.1038/s41598-017-00498-w2045-2322https://doaj.org/article/c82fc060146646478d7b2326ee675af22017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00498-whttps://doaj.org/toc/2045-2322Abstract Understanding the mechanisms underlying variations in carbon isotope discrimination (Δ) in C4 plants is critical for predicting the C3/C4 ratio in C3/C4 mixed grassland. The value of Δ is determined by bundle sheath leakiness (Ф) and the ratio of intercellular to ambient CO2 concentration (C i /C a ). Leaf nitrogen concentration (N leaf ) is considered a driver of Δ in C4 plants. However, little is known about how N leaf affects Ф and C i /C a , and subsequently Δ. Here leaf carbon isotope composition, N leaf , Ф, and leaf gas exchange were measured in Cleistogenes squarrosa, a dominant C4 species in the Inner Mongolia grassland. Δ remained relatively stable under variable N and water supply. Higher N supply and lower water supply increased N leaf , stimulated photosynthesis and further decreased C i /C a . High N supply increased Ф, which responded weakly to water supply. N leaf exerted similar effects on C i /C a and on Ф in the field and pot experiments. Pooling all the data, N leaf explained 73% of the variation in C i /C a . Overall, both Ф and C i /C a determined Δ; however, the contribution of Ф was stronger. N leaf influenced Δ primarily though C i /C a , rather than Ф. Ф should be considered in estimating Δ of C4 endmember.Hao YangQiang YuWen-ping ShengSheng-gong LiJing TianNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hao Yang Qiang Yu Wen-ping Sheng Sheng-gong Li Jing Tian Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
description	Abstract Understanding the mechanisms underlying variations in carbon isotope discrimination (Δ) in C4 plants is critical for predicting the C3/C4 ratio in C3/C4 mixed grassland. The value of Δ is determined by bundle sheath leakiness (Ф) and the ratio of intercellular to ambient CO2 concentration (C i /C a ). Leaf nitrogen concentration (N leaf ) is considered a driver of Δ in C4 plants. However, little is known about how N leaf affects Ф and C i /C a , and subsequently Δ. Here leaf carbon isotope composition, N leaf , Ф, and leaf gas exchange were measured in Cleistogenes squarrosa, a dominant C4 species in the Inner Mongolia grassland. Δ remained relatively stable under variable N and water supply. Higher N supply and lower water supply increased N leaf , stimulated photosynthesis and further decreased C i /C a . High N supply increased Ф, which responded weakly to water supply. N leaf exerted similar effects on C i /C a and on Ф in the field and pot experiments. Pooling all the data, N leaf explained 73% of the variation in C i /C a . Overall, both Ф and C i /C a determined Δ; however, the contribution of Ф was stronger. N leaf influenced Δ primarily though C i /C a , rather than Ф. Ф should be considered in estimating Δ of C4 endmember.
format	article
author	Hao Yang Qiang Yu Wen-ping Sheng Sheng-gong Li Jing Tian
author_facet	Hao Yang Qiang Yu Wen-ping Sheng Sheng-gong Li Jing Tian
author_sort	Hao Yang
title	Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
title_short	Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
title_full	Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
title_fullStr	Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
title_full_unstemmed	Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply
title_sort	determination of leaf carbon isotope discrimination in c4 plants under variable n and water supply
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c82fc060146646478d7b2326ee675af2
work_keys_str_mv	AT haoyang determinationofleafcarbonisotopediscriminationinc4plantsundervariablenandwatersupply AT qiangyu determinationofleafcarbonisotopediscriminationinc4plantsundervariablenandwatersupply AT wenpingsheng determinationofleafcarbonisotopediscriminationinc4plantsundervariablenandwatersupply AT shenggongli determinationofleafcarbonisotopediscriminationinc4plantsundervariablenandwatersupply AT jingtian determinationofleafcarbonisotopediscriminationinc4plantsundervariablenandwatersupply
_version_	1718394893082034176

Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply

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