Plant Cell Journal of Pharmacology and Experimental Therapeutics
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First published online January 17, 2003; 10.1105/tpc.009225

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The Plant Cell, Vol. 15, 439-447, February 2003, Copyright © 2003,
American Society of Plant Biologists

Overexpression of a Plasma Membrane Aquaporin in Transgenic Tobacco Improves Plant Vigor under Favorable Growth Conditions but Not under Drought or Salt Stress

Refael Aharona, Yosepha Shahakb, Smadar Winingerc, Rozalina Bendovc, Yoram Kapulnik1,c and Gad Galilia

a Department of Plant Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
b Department of Horticulture, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
c Department of Agronomy and Natural Resources, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel

1 To whom correspondence should be addressed. E-mail kapulnik{at}agri.huji.ac.il; fax 972-3-9669642

Most of the symplastic water transport in plants occurs via aquaporins, but the extent to which aquaporins contribute to plant water status under favorable growth conditions and abiotic stress is not clear. To address this issue, we constitutively overexpressed the Arabidopsis plasma membrane aquaporin, PIP1b, in transgenic tobacco plants. Under favorable growth conditions, PIP1b overexpression significantly increased plant growth rate, transpiration rate, stomatal density, and photosynthetic efficiency. By contrast, PIP1b overexpression had no beneficial effect under salt stress, whereas during drought stress it had a negative effect, causing faster wilting. Our results suggest that symplastic water transport via plasma membrane aquaporins represents a limiting factor for plant growth and vigor under favorable conditions and that even fully irrigated plants face limited water transportation. By contrast, enhanced symplastic water transport via plasma membrane aquaporins may not have any beneficial effect under salt stress, and it has a deleterious effect during drought stress.




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