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• Effects of Salinity Stress on the Growth, Physiology, and Yield of Soybean (Glycine max (L.) Merrill)

  Nguyen Thi Linh, Le Thi Tuyet Cham, Vu Ngoc Thang

  Received: Dec 08, 2020 / Published: Aug 10, 2021

   Abstract PDF

  This study was conducted to evaluate the salt tolerance ability of two soybean cultivars under salinity conditions using a selection of growth and physiological parameters. Three weeks after germination, plants began being treated with either a 100 mM concentration of NaCl in Hoagland solution or a non-salinity (0 mM NaCl) solution. The results showed that the plant height, number of leaves, leaf area index, and shoot and root biomasses were significantly reduced under salt conditions. A similar tendency was observed in several physiological parameters (SPAD, Fv/Fm). Since all the salt-treated plants of the D8 cultivar were dead after 40 days under the 100 mM NaCl treatment, the yield of D8 could not be obtained, while the treated plants of the D140 cultivar experienced a marked decrease in yield compared to the control plants. In this study, we identified that the D140 soybean cultivar had a better salt tolerance than the D8 soybean cultivar at a 100 mM NaCl concentration.

• Identification of QTLs by Genome-Wide Association Study in Rice for Salt Tolerance

  Thieu Thi Phong Thu, Takeo Yamakawa

  Received: Feb 17, 2025 / Accepted: Mar 27, 2025 / Published: Mar 31, 2025

   Abstract PDF

  A genome-wide association study (GWAS) was performed to identify potential QTLs associated with salt stress tolerance in rice. The correlation between the genotyping data set and the phenotypic expression of 213 diverse rice accessions for 11 biochemical and agronomic traits was assessed. GWAS was run using a mixed linear model and population parameters previously defined in Tassel 5.0 to predict genomic regions associated with traits for the Japonica and Indica subpopulations. GWAS resulted in the detection of numerous SNP markers scattered over the rice genome that were associated with various salt tolerance traits. A QTL region on chromosome 3 was found to contribute to the variation in salt tolerance in the Indica subpopulation and related to the two traits of sheath Ca and sheath Mg contents. Three QTL regions on chromosomes 2, 4, and 5 were found to contribute to the variation in salt tolerance in the Japonica subpopulation and related to the traits of sheath Na content, sheath Mg content, the sheath Na/K ratio, leaf Na content, and the leaf Na/K ratio.