Sodium Chloride-Induced Changes in Mineral Nutrients and Proline Accumulation in Indica Rice Cultivars Differing in Salt Tolerance

The effect of increasing sodium chloride (NaCl; 0 to 300 mM) stress was investigated on plant growth, mineral nutrients, and proline accumulation in two indica rice cultivars differing in salt tolerance. The shoots and roots of 'Karjat-3' (salt sensitive cv.) showed greater reduction in fr...

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Bibliographic Details
Published in:Journal of plant nutrition 2008-10, Vol.31 (10-12), p.1999-2017
Main Authors: Kumar, Vinay, Shriram, Varsha, Nikam, T.D, Jawali, Narendra, Shitole, M.G
Format: Article
Language:English
Subjects:
Brackish
calcium
chlorides
cultivars
Freshwater
genetic variation
indica rice
ion transport
mineral content
mineral nutrients
Oryza sativa
plant nutrition
potassium
proline
rice
roots
salt stress
salt tolerance
shoots
sodium
sodium chloride
sodium/calcium ratio
sodium/potassium ratio
translocation (plant physiology)
uptake mechanisms
water content
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Summary:The effect of increasing sodium chloride (NaCl; 0 to 300 mM) stress was investigated on plant growth, mineral nutrients, and proline accumulation in two indica rice cultivars differing in salt tolerance. The shoots and roots of 'Karjat-3' (salt sensitive cv.) showed greater reduction in fresh weight, dry weight, and water content under increasing salinity stress when compared to 'Panvel-3' (salt tolerant cv.). The magnitude of chloride (Cl) accumulation with increasing salinity varied between cultivars, with lesser accumulation in 'Panvel-3', whereas, calcium (Ca) content was more in 'Panvel-3' than 'Karjat-3' at all salinity levels. Increase in shoot-sodium (Na) did not show notable variation between cultivars under salinity stress; however, Na accumulation was notably lower in roots of 'Panvel-3' than 'Karjat-3'. Under increasing salinity stress, 'Panvel-3' maintained significantly lower sodium/potassium, sodium/calcium and sodium/nitrogen ratios than 'Karjat-3', both in shoots and roots, with more differential response in roots. Regardless of treatment, proline concentration was considerably higher in 'Panvel-3' than in 'Karjat-3'. The salt tolerance of cv. 'Panvel-3' was positively correlated with better growth, higher proline accumulation and enhanced uptakes of beneficial minerals such as potassium (K) and Ca.
ISSN:0190-4167
1532-4087
DOI:10.1080/01904160802403466