Genetic Analysis of Salt Tolerance Related Traits in Sorghum Recombinant Inbred Lines

doi:10.7668/hbnxb.2018.04.016

Abstract

Abstract: Salt tolerance is an important agronomic trait of sorghum. Salt tolerance genetic analysis is important for sorghum breeding. In order to select new varieties of salt-tolerant sorghum and study the genetic rules of salt tolerance, 482 F₅ recombinant inbred lines were obtained from the salt-tolerant cultivar Sanchisan and salt-sensitive cultivars Tx622B, and the germination rate, seedling height, fresh weight and dry weight were used to identify salt tolerance at seedling stage. Genetic analysis was carried out by single-generation combined quantitative trait analysis. The results showed that the sal-tolerance traits of the Sanchisan and salt-sensitive cultivars Tx622B were significantly different. The relative mean values of germination rate, seedling height, fresh weight and dry weight of the F₅ generation group were all different among parents, and the tolerance to salt tolerance was different in different degree. The germination rate, seedling height, fresh weight and dry weight were analyzed. There were significant positive correlations between the two traits. The relative germination rate, relative seedling height, relative fresh weight and relative (B-5)genetic model of two pairs of major genes were found by genetic model analysis. Through genetic model analysis, it was found that salt tolerance of F₅ population of recombinant inbred lines of sorghum was dominant to salt, and inheritance of salt-tolerance trait of sorghum was in line with complete dominant (B-5)genetic model of two major genes. The heritability of the major gene of germination rate was 40.94%. The heritability of major gene of seedling height was 31.22%. The heritability of major gene of fresh weight was 39.19%. The heritability of main gene of dry weight was 63.98%.The germination rate, seedling height, fresh weight and dry weight have high heritability as the main characters of salt tolerance evaluation, and have far-reaching significance for the selection and cultivation of sorghum salt-tolerant varieties.

Key words: Sorghum, Salt tolerance, Quantitative trait, Genetic model

CLC Number:

S514.03

LÜ Jianpeng, LI Jinwang, DUAN Xiafei, LI Yanling, LI Oujing, PEI Zhongyou. Genetic Analysis of Salt Tolerance Related Traits in Sorghum Recombinant Inbred Lines[J]. Acta Agriculturae Boreali-Sinica, 2018, 33(4): 112-119. doi: 10.7668/hbnxb.2018.04.016.

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