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Rapid responses of mesophyll conductance to changes of CO 2 concentration, temperature and irradiance are affected by N supplements in rice
Author(s) -
Xiong Dongliang,
Liu Xi,
Liu Limin,
Douthe Cyril,
Li Yong,
Peng Shaobing,
Huang Jianliang
Publication year - 2015
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12558
Subject(s) - irradiance , photosynthesis , stomatal conductance , conductance , botany , chloroplast , biology , horticulture , chemistry , biophysics , biochemistry , physics , mathematics , quantum mechanics , combinatorics , gene
Photosynthesis in C 3 plants is significantly limited by mesophyll conductance ( g m ), which can vary with leaf anatomical traits and nitrogen ( N ) supplements. Several studies have investigated the response of g m to N supplements; however, none examined the implications of N supplements on the response of g m to rapid environmental changes. Here we investigated the effect of N supplement on g m and the response of g m to change of CO 2 , temperature and irradiance in rice. High N supplement ( HN ) increased mesophyll cell wall surface area and chloroplast surface area exposed to intercellular airspace per leaf area, and reduced cell wall thickness. These changes resulted in increased g m . The g m of leaves with HN was more sensitive to changes in CO 2 concentration, temperature and irradiance. The difference in leaf structural features between low N supplement and HN indicates that a rapid change in g m is related to the regulation of diffusion through biological membranes rather than leaf structural features. These results will contribute to an understanding of the determinants of g m response to rapid changes in environmental factors.