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Root-derived bicarbonate assimilation in response to variable water deficit in Camptotheca acuminate seedlings
Sen Rao;Yanyou Wu
2017
Source PublicationPhotosynthesis Research
Volume134Issue:1Pages:59-70
Abstract

Water deficit is one of the key factors that limits the carbon (C) assimilation and productivity of plants. The effect of variable water deficit on recently root-derived bicarbonate assimilation in Camptotheca acuminate seedlings was investigated. Three-month-old seedlings were subjected to three water regimes, well-watered (WW), moderate stress (MS), and severe stress (SS) induced by polyethyleneglycol, in conjunction with relatively high (H) and low (L) natural C-13-abundance of NaHCO3-labeled treatments in hydroponics for 14 days. The delta C-13 of the newly expanded leaves in H were generally more enriched in heavy isotopes than were those in L, indicative of the involvement of bicarbonate in aboveground tissues. The C isotope fractionation of newly expanded leaves relative to air (a dagger C-13(air-leaves)) ranged from 17.78 to 21.78aEuro degrees among the treatments. The a dagger C-13(air-leaves) under the MS and SS treatments in H were both more negative than was that in L. A linear regression between Ci/Ca and a dagger C-13(air-leaves) in both L and H were different from the theoretical regression. On the basis of the two end-member mixing model, the proportion of fixed CO2 supplied from bicarbonate contributing to the total photosynthetically inorganic C assimilation were 10.34, 20.05 and 16.60% under the WW, MS, and SS treatments, respectively. These results indicated that the increase in water deficit decreased the atmospheric CO2 gain but triggered a compensatory use of bicarbonate in C. acuminate seedlings.

KeywordWater Deficit Bicarbonate Utilization Carbon Assimilation Carbon Isotope Fractionation
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7728
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, People’s Republic of China
2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Sen Rao;Yanyou Wu. Root-derived bicarbonate assimilation in response to variable water deficit in Camptotheca acuminate seedlings[J]. Photosynthesis Research,2017,134(1):59-70.
APA Sen Rao;Yanyou Wu.(2017).Root-derived bicarbonate assimilation in response to variable water deficit in Camptotheca acuminate seedlings.Photosynthesis Research,134(1),59-70.
MLA Sen Rao;Yanyou Wu."Root-derived bicarbonate assimilation in response to variable water deficit in Camptotheca acuminate seedlings".Photosynthesis Research 134.1(2017):59-70.
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