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1 Acta Physiologiae Plantarum

1 2010

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Overexpression of suadea salsa S-adenosylmethionine synthetase gene promotes salt tolerance in transgenic tobacco

100%

Qi Y.-C. , Wang F.-F. , Zhang H. , Liu W.-Q.

Acta Physiologiae Plantarum

2010

tom 32

nr 2

The suadea salsa full-length S-adenosylmethionine synthetase (SsSAMS2) was introduced into tobacco (Nicotiana tabacum L.) by Agrobacterium tumefaciens-mediated transformation. The gene transformation and expression in tobacco were confirmed by PCR, RT-PCR and Northern blotting analysis. Several transgenic lines (ST lines) overexpressing SsSAMS2 gene under the control of cauliflower mosaic virus 35S promoter showed more seeds number and weight, and accumulated higher free total polyamines (PAs) than wild-type plants (WT lines) and transformants with blank vector (BT lines). Salt stress-induced damage was attenuated in these transgenic plants, in the symptom of maintaining higher photosynthetic rate and biomass. These results that the transgenic plants overexpressing suadea salsa SAMS2 are more tolerant to salt stress than wild-type plants suggest that PAs may play an important role in contributing salt tolerance to plants.