期刊
JOURNAL OF PLANT GROWTH REGULATION
卷 40, 期 5, 页码 1853-1868出版社
SPRINGER
DOI: 10.1007/s00344-020-10235-9
关键词
Antioxidant; Local rice varieties; Proline; Reactive oxygen species; Salinity
资金
- Ministry of Science and Technology, Bangladesh
- [APVV-18-0465]
- [EPPN2020-OPVaI-VA-ITMS313011T813]
Genetic diversity is a valuable resource for crop improvement, as demonstrated in a study focusing on identifying potential salt-tolerant rice genotypes. Through screening and analysis, it was found that certain landraces exhibited high salt tolerance, clustered together in growth parameter analysis, and displayed advantages in principle component analysis.
Genetic diversity is a useful resource for crop improvement. In this study, a total of 28 rice genotypes were screened to isolate potential salt-tolerant genotypes at the seedling stage using hydroponic system. Different morpho-physiological indicators were used to classify tolerant and susceptible genotypes and biochemical determinants were dissected to clarify the underlying tolerance mechanism. Rice seedling were treated with two salinity levels (EC-1.1 dSm(-1)(control) and EC-7 dSm(-1)) for 18 days. Salt stress resulted in significant decrease of growth and physiological traits in all genotypes; however, the lowest reduction was observed in some salt-tolerant genotypes namelyGhunsi, Nonabokra, Hogla, Holdegotal, Vusieri,andKanchon. Cluster analysis considering percent reduction of growth parameters categorized the genotypes into four main sub-clusters and importantly, the salt-tolerant landraces were placed in the same cluster (cluster-II) with salt-tolerant check genotypes. The results of principle component analyses also demonstrated highly salt-tolerant genotypes wereVusieri > Nonabokra > Ghunsi > Hogla > Holdegotal > Kanchon. To explore the potential biochemical basis of salt stress tolerance, three tolerant genotypes were further characterized along with a salt-sensitive genotype. The higher K+/Na(+)ratios noted for all salt-tolerant landraces thus indicating that the K+/Na(+)ratio serves as a reliable indicator of salt tolerance in rice. The higher increment of proline content, catalase, ascorbate peroxidase activities, and comparatively lower accumulation of H(2)O(2)and MDA were reported in salt-tolerant landraces as compared with salt-sensitive genotype. Therefore, these landraces could be utilized as promising genotypes as a source of salt-tolerant parents in the hybridization program for the development of high-yielding salt-tolerant rice variety as well as in isolating salt-tolerant genes.
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