Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon.

Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon. Research Abstract Details 

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Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon. Abstract Text:

T Ohrui,H Nobira,Y Sakata,T Taji,C Yamamoto,K Nishida,T Yamakawa,Y Sasuga,Y Yaguchi,H Takenaga,Shigeo Tanaka,T Ohrui,H Nobira,Y Sakata,T Taji,C Yamamoto,K Nishida,T Yamakawa,Y Sasuga,Y Yaguchi,H Takenaga,Shigeo Tanaka,

The atmospheric epiphyte Tillandsia ionantha is capable of surviving drought stress for 6 months or more without any exogenous water supply via an as of yet to be determined mechanism. When plants were soaked in water for 3 h, leaves absorbed a remarkably large amount of water (30-40% on the basis of fresh weight), exhibiting a bimodal absorption pattern. Radiolabeled water was taken up by the leaves by capillary action of the epidermal trichomes within 1 min (phase 1) and then transported intracellularly to leaf tissues over 3 h (phase 2). The removal of epidermal trichome wings from leaves as well as rinsing leaves with water significantly lowered the extracellular accumulation of water on leaf surfaces. The intracellular transport of water was inhibited by mercuric chloride, implicating the involvement of a water channel aquaporin in second-phase water absorption. Four cDNA clones (TiPIP1a, TiPIP1b, TiPIP1c, and TiPIP2a) homologous to PIP family aquaporins were isolated from the leaves, and RT-PCR showed that soaking plants in water stimulated the expression of TiPIP2a mRNA, suggesting the reinforcement in ability to rapidly absorb a large amount of water. The expression of TiPIP2a complementary RNA in Xenopus oocytes enhanced permeability, and treatment with inhibitors suggested that the water channel activity of TiPIP2a protein was regulated by phosphorylation. Thus, the high water uptake capability of T. ionantha leaves surviving drought is attributable to a bimodal trichome- and aquaporin-aided water uptake system based on rapid physical collection of water and subsequent, sustained chemical absorption.

Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon. Publishing Authors By Initials

T Ohrui,H Nobira,Y Sakata,T Taji,C Yamamoto,K Nishida,T Yamakawa,Y Sasuga,Y Yaguchi,H Takenaga,S Tanaka,T Ohrui,H Nobira,Y Sakata,T Taji,C Yamamoto,K Nishida,T Yamakawa,Y Sasuga,Y Yaguchi,H Takenaga,S Tanaka,

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Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Planta

VOLUME: 227

Page Numbers: 47-56

Journal Abbreviation: Planta

ISSN: 0032-0935

DAY: 3

MONTH: 08

YEAR: 2007

Foliar trichome- and aquaporin-aided water uptake in a drought-resistant epiphyte Tillandsia ionantha Planchon. Information

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LANGUAGE: eng

NlmUniqueID: 1250576

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AFFILIATION: Faculty of Applied Bioscience, Tokyo University of Agriculture, Sakuragaoka, Tokyo, Japan.

Country: Germany

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