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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-08-03

AUTHORS

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

ABSTRACT

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. More... »

PAGES

47-56

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00425-007-0593-0

DOI

http://dx.doi.org/10.1007/s00425-007-0593-0

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1027603571

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17674031


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72 leaf surface
73 leaf tissue
74 leaves
75 mRNA
76 mechanism
77 mercuric chloride
78 min
79 months
80 patterns
81 permeability
82 phosphorylation
83 physical collections
84 plants
85 protein
86 reinforcement
87 removal
88 stress
89 supply
90 surface
91 system
92 tissue
93 transport
94 treatment
95 trichomes
96 uptake
97 uptake capability
98 uptake system
99 water
100 water absorption
101 water channel activity
102 water channel aquaporins
103 water supply
104 water uptake
105 water uptake capability
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