Salinity-tolerance related indices for screening rice (Oryza sativa L.) cultivars
سال انتشار: 1401
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 90
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شناسه ملی سند علمی:
JR_IAR-40-2_006
تاریخ نمایه سازی: 20 تیر 1401
چکیده مقاله:
Rice (Oryza sativa L.) serves as the main food for more than half of the world's population. Salinity is one of the most important factors which limits rice yield. Eleven rice cultivars were evaluated in a randomized complete block design with three replications under salinity stress and normal conditions. The stress tolerance and sensitivity indices, including the mean productivity (MP), the geometric mean (GMP), the stress tolerance index (STI), the yield index, the yield stability index, the harmonic mean (HM), the stress susceptibility index, the tolerance index and yield loss rate, and principal component analysis were used to evaluate the variation and response of rice cultivars under salinity stress conditions, and to identify the tolerant cultivars. A significant variation was observed among the cultivars for grain yield and stress indices. Principal component analysis using grain yield and stress tolerance indices identified two components including “salinity tolerance component” and “salinity sensitivity index component” with eigenvalues greater than ۱, which described a cumulative explanation of ۹۹.۳۹ percent of the variance among the cultivars. MP, GMP, and STI were found to be considered as the most suitable indices for selecting rice cultivars tolerant to salinity. The cluster analysis and the distribution of the cultivars in the biplot diagram obtained based on grain yield, and stress tolerance indices introduced Lenjan Askari, Yasouj, and Kamfirouz as tolerant, and Loudab Champa, Gharib, and Mamassani Domsiah as sensitive cultivars. These tolerant cultivars can be used in breeding programs to improve the salinity tolerance of rice.
کلیدواژه ها:
نویسندگان
Ahmad Majidi Mehr
Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj I. R. Iran. and Present address: Department of Genetics and Plant Breeding, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan
Reza Amiri Fahliani
Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj I. R. Iran.
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