Co-Authors:
Aharon, R., Department of Plant Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
Shahak, Y., Department of Horticulture, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Wininger, S., Dept. of Agronomy/Natural Resources, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Bendov, R., Dept. of Agronomy/Natural Resources, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Kapulnik, Y., Dept. of Agronomy/Natural Resources, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Galili, G., Department of Plant Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
Abstract:
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.
תפריט נגישות
ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
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