Phosphorus deprivation effects on water relations of Nicotiana tabacum plant via reducing plasma membrane permeability

Phosphorus deprivation effects on water relations of Nicotiana tabacum plant via reducing plasma... Plants grown in phosphorus-deprived solutions often exhibit disruption of water transport due to reduction in root hydraulic conductivity (Lp r ). To uncover the relationship between root Lp r and water permeability coefficient (P f) of plasma membrane and the role of aquaporins, we evaluated P f of plasma membrane and also PIP-type aquaporin gene expression in tobacco (Nicotiana tabacum L.) plant roots after seven days P-deprivation. The results showed significant reduction in sap flow rate (J v) and osmotic root hydraulic conductivity (L pr-o) in P-deprived roots. These effects were reversed 24 h after P-resupplying. Interestingly, the P f of root protoplasts was 57% lower in P-deprived plants compared with P-sufficient ones. The expression of NtPIP1;1 and NtPIP2;1 aquaporins did not change significantly in P-deprived plants compared with P-sufficient ones, but the copy number of NtAQP1 increased significantly in P-deprived plants. P-deprivation did not change Lp r-o significantly in antisense NtAQP1 plants. Taken together, these findings suggest that P-deprivation may play an important role in modulation of root hydraulic conductivity by affecting P f in transcellular pathway of water flow across roots and aquaporins. Finally, we concluded that dominant water transport pathway under P-deprivation was transcellular one. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Phosphorus deprivation effects on water relations of Nicotiana tabacum plant via reducing plasma membrane permeability

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Publisher
Pleiades Publishing
Copyright
Copyright © 2016 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S102144371601012X
Publisher site
See Article on Publisher Site

Abstract

Plants grown in phosphorus-deprived solutions often exhibit disruption of water transport due to reduction in root hydraulic conductivity (Lp r ). To uncover the relationship between root Lp r and water permeability coefficient (P f) of plasma membrane and the role of aquaporins, we evaluated P f of plasma membrane and also PIP-type aquaporin gene expression in tobacco (Nicotiana tabacum L.) plant roots after seven days P-deprivation. The results showed significant reduction in sap flow rate (J v) and osmotic root hydraulic conductivity (L pr-o) in P-deprived roots. These effects were reversed 24 h after P-resupplying. Interestingly, the P f of root protoplasts was 57% lower in P-deprived plants compared with P-sufficient ones. The expression of NtPIP1;1 and NtPIP2;1 aquaporins did not change significantly in P-deprived plants compared with P-sufficient ones, but the copy number of NtAQP1 increased significantly in P-deprived plants. P-deprivation did not change Lp r-o significantly in antisense NtAQP1 plants. Taken together, these findings suggest that P-deprivation may play an important role in modulation of root hydraulic conductivity by affecting P f in transcellular pathway of water flow across roots and aquaporins. Finally, we concluded that dominant water transport pathway under P-deprivation was transcellular one.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Feb 16, 2016

References

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