Improving plant stress tolerance and yield production : is the tonoplast aquaporin SlTIP2;2 a key to isohydric to anisohydric conversion?

Anisohydric plants are thought to be more drought tolerant than isohydric plants. However, the molecular mechanism determining whether the plant water potential during the day remains constant or not regardless of the evaporative demand (isohydric vs anisohydric plant) is not known. Here, it was hyp...

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Veröffentlicht in:The New phytologist. - 1990. - 181(2009), 3 vom: 01., Seite 651-61
1. Verfasser: Sade, Nir (VerfasserIn)
Weitere Verfasser: Vinocur, Basia J, Diber, Alex, Shatil, Arava, Ronen, Gil, Nissan, Hagit, Wallach, Rony, Karchi, Hagai, Moshelion, Menachem
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2009
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Membrane Proteins Plant Proteins Recombinant Fusion Proteins tonoplast intrinsic protein, plant Water 059QF0KO0R Green Fluorescent Proteins 147336-22-9 mehr... Sodium Chloride 451W47IQ8X
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520 |a Anisohydric plants are thought to be more drought tolerant than isohydric plants. However, the molecular mechanism determining whether the plant water potential during the day remains constant or not regardless of the evaporative demand (isohydric vs anisohydric plant) is not known. Here, it was hypothesized that aquaporins take part in this molecular mechanism determining the plant isohydric threshold. Using computational mining a key tonoplast aquaporin, tonoplast intrinsic protein 2;2 (SlTIP2;2), was selected within the large multifunctional gene family of tomato (Solanum lycopersicum) aquaporins based on its induction in response to abiotic stresses. SlTIP2;2-transformed plants (TOM-SlTIP2;2) were compared with controls in physiological assays at cellular and whole-plant levels. Constitutive expression of SlTIP2;2 increased the osmotic water permeability of the cell and whole-plant transpiration. Under drought, these plants transpired more and for longer periods than control plants, reaching a lower relative water content, a behavior characterizing anisohydric plants. In 3-yr consecutive commercial glasshouse trials, TOM-SlTIP2;2 showed significant increases in fruit yield, harvest index and plant mass relative to the control under both normal and water-stress conditions. In conclusion, it is proposed that the regulation mechanism controlling tonoplast water permeability might have a role in determining the whole-plant ishohydric threshold, and thus its abiotic stress tolerance 
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650 4 |a Research Support, Non-U.S. Gov't 
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650 7 |a Recombinant Fusion Proteins  |2 NLM 
650 7 |a tonoplast intrinsic protein, plant  |2 NLM 
650 7 |a Water  |2 NLM 
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700 1 |a Vinocur, Basia J  |e verfasserin  |4 aut 
700 1 |a Diber, Alex  |e verfasserin  |4 aut 
700 1 |a Shatil, Arava  |e verfasserin  |4 aut 
700 1 |a Ronen, Gil  |e verfasserin  |4 aut 
700 1 |a Nissan, Hagit  |e verfasserin  |4 aut 
700 1 |a Wallach, Rony  |e verfasserin  |4 aut 
700 1 |a Karchi, Hagai  |e verfasserin  |4 aut 
700 1 |a Moshelion, Menachem  |e verfasserin  |4 aut 
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