Inheritance and QTL Mapping of Salt Tolerance in Rice

摘要/Abstract

摘要：

An F₂ population derived from the cross between Jiucaiqing (japonica) and IR36 (indica) was used to analyze the inheritance of salt tolerance in rice by genetic model of major-genes plus polygenes, and to map the corresponding QTLs by SSR molecular markers. Rice plants of P₁, P₂, F₁ and F₂ at 5- to 6- leaf stage were treated under 140 mmol/LNaCl for 10 days. Three indices representing the ability of salt tolerance of rice seedlings were measured, including salt tolerance rating (STR), Na⁺/K⁺ ratioin roots and dry matter weight of shoots (DWS). STR, Na⁺/K⁺ and DWS were all controlled by two major genes with modification by polygenes. Heritability of these traits from major genes was 17.8, 53.3 and 52.3%, respectively. The linkage map constructed by 62 SSR molecular markers covered a total length of about 1 142 cM. There were three QTLs detected for STR located on chromosome 1, 5 and 9, two QTLs for DWS on chromosomes 8 and 9, and two QTLs for Na⁺/K⁺ on chromosomes 2 and 6, one on each chromosome respectively. Single QTL accounted for 6.7 to 19.3% of phenotypic variation. Identification method of salt tolerance in rice and breeding of rice varieties with salt tolerance based on molecular markers assisted selection had been discussed.

关键词: rice (Oryza sativa), salt tolerance, inheritance, quantitative trait locus, molecular marker

YAO Ming-zhe, WANG Jian-fei, CHEN Hong-you, ZHAI Hu-qu, ZHANG Hong-sheng . Inheritance and QTL Mapping of Salt Tolerance in Rice
[J]. RICE SCIENCE.

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