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Asian Journal of Crop Science
  Year: 2013 | Volume: 5 | Issue: 4 | Page No.: 405-415
DOI: 10.3923/ajcs.2013.405.415
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Alleviation of Adverse Effects of Salt Stress on Rice Seedlings by Exogenous Trehalose

P. Theerakulpisut and S. Phongngarm

Synthesis and accumulation of small organic osmolytes is a mechanism which protects plants from damaging effects of abiotic stresses including salinity. The effects of three different osmoprotectants; trehalose (Tre), proline (Pro), and sorbitol (Sor) on growth and physiology of rice seedlings subjected to salt stress were compared in this study. Four-day-old seedlings of rice cvs. Pokkali (PK; salt-tolerant) and Patumthani 60 (PT60; salt-sensitive) were treated with 5 mM and 10 mM Tre, Pro or Sor without and with 170 mM NaCl for 10 days. NaCl inhibited growth, caused a reduction in chlorophyll and K+ and increase Na+ and Na+: K+ ratio and the adverse effects of salt were more pronounced in PT60. Under salt stress, exogenous Tre was capable of alleviating the deleterious effects of NaCl by enhancing growth, maintaining chlorophyll content and reducing Na+: K+ ratio. In contrast, Pro exacerbated the effects of NaCl by further reducing plant height, fresh and dry weights, although, it did not have any effects on chlorophyll content and ion accumulation. Exogenous Sor neither alleviated nor exacerbated the effects of NaCl. These results indicated that Tre was the most effective osmoprotectant which offered protective roles for rice seedlings subjected to salt stress and presented a practical implication for rice cultivation in salt-affected soils.
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How to cite this article:

P. Theerakulpisut and S. Phongngarm, 2013. Alleviation of Adverse Effects of Salt Stress on Rice Seedlings by Exogenous Trehalose. Asian Journal of Crop Science, 5: 405-415.

DOI: 10.3923/ajcs.2013.405.415






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