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Cloning of an H+-PPase gene from Thellungiella halophila and its heterologous expression to improve tobacco salt tolerance.

Abstract：

:An H(+)-pyrophosphatase (PPase) gene named TsVP involved in basic biochemical and physiological mechanisms was cloned from Thellungiella halophila. The deduced translation product has similar characteristics to H(+)-PPases from other species, such as Arabidopsis and rice, in terms of bioinformation. The heterologous expression of TsVP in the yeast mutant ena1 suppressed Na(+) hypersensitivity and demonstrated the function of TsVP as an H(+)-PPase. Transgenic tobacco overexpressing TsVP had 60% greater dry weight than wild-type tobacco at 300 mM NaCl and higher viability of mesophyll protoplasts under salt shock stress conditions. TsVP and AVP1, another H(+)-PPase from Arabidopsis, were heterologously expressed separately in both the yeast mutant ena1 and tobacco. The salt tolerance of TsVP or AVP1 yeast transformants and transgenic tobacco were improved to almost the same level. The TsVP transgenic tobacco lines TL3 and TL5 with the highest H(+)-PPase hydrolytic activity were studied further. These transgenic tobacco plants accumulated 25% more solutes than wild-type plants without NaCl stress and 20-32% more Na(+) under salt stress conditions. Although transgenic tobacco lines TL3 and TL5 accumulated more Na(+) in leaf tissues, the malondialdehyde content and cell membrane damage were less than those of the wild type under salt stress conditions. Presumably, compartmentalization of Na(+) in vacuoles reduces its toxic effects on plant cells. This result supports the hypothesis that overexpression of H(+)-PPase causes the accumulation of Na(+) in vacuoles instead of in the cytoplasm and avoids the toxicity of excessive Na(+) in plant cells.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Gao F,Gao Q,Duan X,Yue G,Yang A,Zhang J

doi

10.1093/jxb/erl090

subject

Has Abstract

pub_date

2006-01-01 00:00:00

pages

3259-70

issue

12

eissn

0022-0957

issn

1460-2431

pii

erl090

journal_volume

57

pub_type

杂志文章

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