Differences in the regulation of ion imbalance in response to high Na+ load hint at differential strategies for salt-tolerance in mungbean genotypes (Vigna radiata L.)

Talakayala, A and Jupally, Y and Asinti, S and Mekala, G K and Kirti, P B and Sharma, I (2024) Differences in the regulation of ion imbalance in response to high Na+ load hint at differential strategies for salt-tolerance in mungbean genotypes (Vigna radiata L.). Plant Growth Regulation, 105. pp. 89-109. ISSN 0167-6903

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Abstract

Development of high-yielding plant varieties resilient to environmental challenges is often hindered by the absence of genotype and growth-stage specific insights into the molecular mechanisms involved in plant survival under stress conditions. In the present study, we aimed to address this gap by analysing various physiological traits in three mungbean genotypes, viz., MGG 295, MGG 351 and LGG 460 subjected to NaCl stress (8 dS m−1 and 16 dS m−1) during early vegetative stage. MGG 295 and MGG 351 exhibited superior salt tolerance compared to LGG 460, as evidenced by their growth performance and physiological responses, including photosynthesis, transpiration rate, membrane integrity, and reactive oxygen species (ROS) production and scavenging. Interestingly, MGG 295 showed low-ionic discrimination and non-selective uptake of Na+ and K+ in roots for salt tolerance. Conversely, MGG 351 exhibited low leaf and root Na+ content, indicative of Na+ extrusion and sequestration, similar to the salt-sensitive LGG 460. Expression of different Na+ and K+ transporter genes suggested SOS1, SOS2-mediated ion exclusion in LGG 460 and NHX1- mediated ion sequestration in LGG 460 and MGG 351. Tolerant genotypes exhibited AKT1-mediated K+ uptake. Moreover, MGG 295 blocked the uptake of Cl− suggesting an ion-wise differential strategy adopted by the plant to survive ion toxicity. These preliminary findings provide some interesting insights into the alternate approaches to salinity tolerance that are potentially less energy intensive for stress survival.

Item Type:	Article
Divisions:	Global Research Program - Accelerated Crop Improvement
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Soil salinity, Mungbean, Ion imbalance, Growth, Photosynthesis, Oxidative stress
Subjects:	Others > Soil Others > Plant Nutrition Others > Genetics and Genomics Others > Plant Growth
Depositing User:	Mr Nagaraju T
Date Deposited:	02 Jun 2025 04:49
Last Modified:	02 Jun 2025 04:49
URI:	http://oar.icrisat.org/id/eprint/13089
Official URL:	https://link.springer.com/article/10.1007/s10725-0...
Projects:	UNSPECIFIED
Funders:	Government of India - Department of Biotechnology
Acknowledgement:	IS thanks Department of Biotechnology, Govt. of India for funding assistance in the form of Ramalingaswami Fellowship (Grant no. BT/RLF/Re-entry/48/2018). PBK is supported by the NASI-Platinum Jubilee Senior Scientist position.
Links:	Google Scholar

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