Low Ca2+/Na+ ratio and efficiency of mobilization of Ca2+ from shoot tissues to Kernel determine salinity tolerance in groundnut (Arachis hypogaea L.)

Azad, M.A.K. and Alam, M.S. and Hamid, M.A. and Hossain, M.A. (2013) Low Ca2+/Na+ ratio and efficiency of mobilization of Ca2+ from shoot tissues to Kernel determine salinity tolerance in groundnut (Arachis hypogaea L.). Legume Research, 36 (5). pp. 396-405.

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Abstract

Variety, salinity level and growth stage showed highly significant (P≤ 0.01) differences for most of the yield attributes and uptake of nutrient elements except sheling percentage for variety and Na+, K+ and Na+/K+ for growth stage. The interaction of variety, salinity level and growth stage, the most important part of this study, also showed similar significant differences as in the main terms for most of the characters studied. It appeared that tolerance based on economic yield of the variety differed with stage of salinity imposition. Binachinabadam-3 appeared tolerant across all salinity levels at vegetative, and at 5dS/m across all growth stages, Dacca-1 and Zhingabadam across 3, 7 and 9dS/m salinities at flowering and pod filling stages, respectively, despite having lower K+/Na+ ratios. of the stages, tolerance could be classified in order of vegetative> pod filling> flowering stage. The tolerance of a variety based on economic yield was conferred by its low Ca2+/Na+ ratio in the shoot tissues. Moreover, the variety that could mobilize Ca2+ more at flowering stage from shoot tissues to reproductive organs particularly kernel under salinity stress attained more tolerance. The excess Na+ in shoot tissues of salinity stressed groundnut does not move to flower rather a portion to the kernel. In contrast, K+ and Ca2+ move from shoot tissues to all reproductive organs including flower with being the highest to the kernel

Item Type: Article
Uncontrolled Keywords: Ca2+/Na+ ratio, Economic yield, Groundnut, K+/Na+ ratio, Salinity tolerance
Author Affiliation: Bangladesh Agricultural University Campus, Mymensingh-2202, Bangladesh
Subjects: Crop Improvement
Divisions: Groundnut
Depositing User: Mr B Krishnamurthy
Date Deposited: 30 Mar 2014 09:32
Last Modified: 30 Mar 2014 09:32
Official URL: http://www.indianjournals.com/ijor.aspx?target=ijo...
URI: http://eprints.icrisat.ac.in/id/eprint/12726

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