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Calcium regulates the cell-to-cell water flow pathway in maize roots during variable water conditions.
MedLine Citation:
PMID:  22841977     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Soil water shortages can decrease root hydraulic conductivity and affect Ca uptake and movement through the plant. In this study, the effects of extra Ca(2+) applied in nutrient solution on the hydraulic properties of the whole roots (Lp(r)) and cortical cells (Lp(cell)) of maize (Zea mays L.) subjected to variable water conditions were investigated. Under well-watered conditions, extra Ca(2+) significantly increased the root Ca content, total root length, and lateral root number; however, it reduced the root cortical cell volume, Lp(r), and Lp(cell). Hg(2+) inhibition experiments suggested that extra Ca(2+) could reduce the contribution of the cell-to-cell water flow pathway. Osmotic stress (10% PEG6000) significantly decreased the cortical cell volume, Lp(r), and Lp(cell) in the control plants, but smaller decreases were observed in the extra Ca(2+) plants. The Hg(2+) treatment reduced the Lp(r) larger in the extra Ca(2+) plants (74.6%) than in the control plants (53.2%), suggesting a higher contribution of the cell-to-cell pathway. The larger Hg(2+) inhibition of the Lp(cell) in the extra Ca(2+) roots (67.2%) when compared to the controls (56.4%) indicated that extra Ca(2+) can mitigate the inhibition of aquaporin expression and/or activity levels via osmotic stress. After 2 d of rehydration, the extra Ca(2+) helped the Lp(r) and Lp(cell) to recover almost completely, but these properties only partially recovered in the control plants. In conclusion, extra Ca(2+) may adjust the contribution of cell-to-cell pathway by regulating the expression and/or activity levels of AQPs according to water availability; this regulation may weaken negative effects and optimize water use.
Authors:
Yan Wu; Xiaofang Liu; Weifeng Wang; Suiqi Zhang; Bingcheng Xu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-13
Journal Detail:
Title:  Plant physiology and biochemistry : PPB / Societe francaise de physiologie vegetale     Volume:  58C     ISSN:  1873-2690     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882449     Medline TA:  Plant Physiol Biochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  212-219     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Masson SAS. All rights reserved.
Affiliation:
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, 26# Xinong Road, Yangling, Shaanxi 712100, PR China.
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