Chlorophyll Retention and High Photosynthetic Performance Contribute to Salinity Tolerance in Rice Carrying Drought Tolerance Quantitative Trait Loci (QTLs)

Noppawan Nounjan, Wuttipong Mahakham, Jonaliza L. Siangliw, Theerayut Toojinda and Piyada Theerakulpisut
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Noppawan Nounjan: Salt-tolerant Rice Research Group, Department of Biology, Faculty of Science, Khon Kaen University, Nai Mueang, Mueang Khon Kaen, Khon Kaen 40002, Thailand
Wuttipong Mahakham: Salt-tolerant Rice Research Group, Department of Biology, Faculty of Science, Khon Kaen University, Nai Mueang, Mueang Khon Kaen, Khon Kaen 40002, Thailand
Jonaliza L. Siangliw: National Center for Genetic Engineering and Biotechnology, NSTDA, 113 Phahonyothin Rd. Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand
Theerayut Toojinda: National Center for Genetic Engineering and Biotechnology, NSTDA, 113 Phahonyothin Rd. Khlong Nueng, Khlong Luang, Pathum Thani 12120, Thailand
Piyada Theerakulpisut: Salt-tolerant Rice Research Group, Department of Biology, Faculty of Science, Khon Kaen University, Nai Mueang, Mueang Khon Kaen, Khon Kaen 40002, Thailand

Agriculture, 2020, vol. 10, issue 12, 1-18

Abstract: Jasmine rice ( Oryza sativa L.), or Khao Dawk Mali 105 (KDML105), is sensitive to drought and salt stresses. In this study, two improved drought-tolerant chromosome segment substitution lines (CSSLs) of KDML105 (CSSL8-103 and CSSL8-106), which carry drought tolerance quantitative trait loci (QTLs) on chromosome 8, were evaluated for salt tolerance and were compared with KDML105 and the QTL donor DH103, their parents and the salt-tolerant genotype Pokkali. After being subjected to salt stress for 6 days, 3-week-old seedlings of Pokkali showed the highest salt tolerance. Parameters related to photosynthesis were less inhibited in both CSSLs and the donor DH103, while these parameters were more severely damaged in the recurrent parent KDML105. Albeit a high ratio of Na + /K + , CSSLs and DH103 showed similar or higher contents of soluble sugar and activity of superoxide dismutase (SOD; EC1.15.1.1) compared with Pokkali, indicating possible mechanisms of either tissue or osmotic tolerance in these plants. The expression of a putative gene Os08g41990 (aminotransferase), which is located in DT-QTL and is involved in chlorophyll biosynthesis, significantly decreased under salt stress in KDML105 and CSSL8-103, while no obvious change in the expression of this gene was observed in Pokkali, DH103 and CSSL8-106. This gene might play a role in maintaining chlorophyll content under stress conditions. Taken together, the results of this study indicate that DT-QTL could contribute to the enhancement of photosynthetic performance in CSSL lines, leading to changes in their physiological ability to tolerate salinity stress.

Keywords: chlorophyll; chromosome segments substitution lines; drought tolerance quantitative trait loci (QTL); photosynthesis; salt stress; rice (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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