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Dissection of closely linked QTLs controlling stigma exsertion rate in rice by substitution mapping
Saturday, 2021/04/03 | 06:32:27

Quanya TanChengshu WangXin LuanLingjie ZhengYuerong NiWeifeng YangZifeng YangHaitao ZhuRuizhen ZengGuifu LiuShaokui Wang & Guiquan Zhang

Theoretical and Applied Genetics April 2021; vol. 134:1253–1262.

Key message

Through substitution mapping strategy, two pairs of closely linked QTLs controlling stigma exsertion rate were dissected from chromosomes 2 and 3 and the four QTLs were fine mapped.


Stigma exsertion rate (SER) is an important trait affecting the outcrossing ability of male sterility lines in hybrid rice. This complex trait was controlled by multiple QTLs and affected by environment condition. Here, we dissected, respectively, two pairs of tightly linked QTLs for SER on chromosomes 2 and 3 by substitution mapping. On chromosome 2, two linkage QTLs, qSER-2a and qSER-2b, were located in the region of 1288.0 kb, and were, respectively, delimited to the intervals of 234.9 kb and 214.3 kb. On chromosome 3, two QTLs, qSER-3a and qSER-3b, were detected in the region of 3575.5 kb and were narrowed down to 319.1 kb and 637.3 kb, respectively. The additive effects of four QTLs ranged from 7.9 to 9.0%. The epistatic effect produced by the interaction of qSER-2a and qSER-2b was much greater than that of qSER-3a and qSER-3b. The open reading frames were identified within the maximum intervals of qSER-2aqSER-2b and qSER-3a, respectively. These results revealed that there are potential QTL clusters for SER in the two regions of chromosome 2 and chromosome 3. Fine mapping of the QTLs laid a foundation for cloning of the genes of SER.


See: https://link.springer.com/article/10.1007/s00122-021-03771-9


Figure 2: Substitution mapping of QTLs for SER on chromosome 2. a The substitution segment of SSSL-A42 on chromosome 2. Physical distance (Mb) was shown under the chromosome. b Plant type of SSSL-A42 and HJX74, scale bar, 15 cm. c Substitution mapping based on the substitution segments of six SSSLs. d Secondary substitution mapping of QTLs based on the substitution segment of SSSL-A42. SER stigma exsertion rate. SER (%) was a mean ± S.E. in nine cropping seasons (c) and two cropping seasons (d). Different alphabet letters denote differences at 0.01 level of significance in Duncan test. White and black blocks on chromosomes represent genotypes of HJX74 and donor, respectively.

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