Exploring diversity among rice germplasms based on their physiological traits responses to salinity
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J. Crop Sci. Biotech. 2017 (June) 20 (2) : 137 ~ 154 DOI No. 10.1007/s12892-017-0030-0 RESEARCH ARTICLE
Exploring Diversity among Rice Germplasms based on Their Physiological Traits Responses to Salinity Inja Naga Bheema Lingeswar Reddy1*, Suk-Young Lee1, Yong-Jin Park2, Taek-Ryoun Kwon1** 1
The National Institute of Agricultural Sciences, RDA, Jeonju-54874, South Korea The National Gongju University, Gongju, South Korea
2
Received: February 14, 2017 / Revised: May 24, 2017 / Accepted: May 28, 2017 Ⓒ Korean Society of Crop Science and Springer 2017
Abstract Salinity is one of the major abiotic stresses that severely effects rice production throughout the world. Previously, there have not been many studies which focused on studying diversity among rice germplasm based on specific physiological traits for salt tolerance. Our diversity study was based on physiological traits such as Na+ concentration, K+ concentration, K+/Na+ ratio, osmotic potential, and biomass which are major components determining salt tolerance. This study has systematically analyzed phenotypic data of 191 germplasms in two different salt concentrations apart from the control. The current study identified salt tolerant germplasms based on their response to a single physiological trait as well as a combination of different physiological traits. Some of the germplasm identified outperformed known salt tolerant cultivar Pokkali. This study identifies correlation among various physiological traits. The salt tolerant germplasms can be taken forward into developing better varieties by conventional breeding and exploring genes for salt tolerance. Key words : Rice, salt tolerance, physiological traits, diversity
Introduction Rice (Oryza sativa L.) is the main cereal crop in Asian counties representing 50-80% of people’s daily caloric intake (Khush et al. 2005). Salinity is one of the major abiotic stresses that is severely affecting crop production throughout the world (FAO 2014). According to a report nearly 6.5% of world’s total area and about 20% of the arable land is already affected by soil salinity (Hakim et al. 2014). Millions of hectares of land well suited for rice production in South and Southeast Asia are left uncultivated or grown with very low yields because of salinity (Knowledgebank.irri). Growth reduced by salinity can be distinguished by measuring effects immediately upon the addition of salt or measured after several days to weeks; short-term salinity affects stomatal closure which in turn causes an increase in leaf temperature and inhibition of shoot Inja Naga Bheema Lingeswar Reddy () Email: [email protected] Taek-Ryoun Kwon () Email: [email protected] Tel: +82-64-683-4661 Fax: +82-64-683-4654
The Korean Society of Crop Science
elongation which is termed as osmotic phase (Munns and Tester 2008; Roy et al. 2014) where as in response to extended salinity there is inhibition of growth over a period of time and premature senescence of older leaves which is termed as ionic phase (Munns and Tester 2008). Salt tolerance in ric
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