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Identification and validation of a novel tiller inhibition locus (tin7) on chromosome 2BL in wheat

文献类型： 外文期刊

作者： Hou, Shuai 1 ; Mou, Yuzhou 1 ; Li, Haojie 1 ; Li, Caixia 1 ; Wang, Zhiqiang 3 ; Lin, Yu 1 ; Liu, Yueyue 4 ; Liu, Yaxi 1 ;

作者机构： 1.State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu 611130, Peoples R China

2.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Peoples R China

3.Chengdu Agr Coll, Chengdu 611130, Peoples R China

4.Sichuan Acad Agr Sci, Chengdu 610066, Peoples R China

关键词： Wheat; Tiller Inhibition gene; BSR-Seq; Wheat 55 K single nucleotide polymorphism array

期刊名称：MOLECULAR BREEDING （ 影响因子：3.0； 五年影响因子：3.0 ）

ISSN： 1380-3743

年卷期： 2025 年 45 卷 5 期

页码：

收录情况： SCI

摘要： Tiller number is a key determinant of the number of spikes per plant, significantly influencing yield. Here, we identify and characterize a novel tiller inhibition line, N2496. Using an F2 segregating population derived from crossing N2496 and CN16, we mapped this locus. The F1 line demonstrated a high number of tillers, while the F2 population exhibited segregated ratios of 3:1 in tiller number. BSR-Seq analysis indicated that only one locus controls tiller number, located on chromosome 2B (Chr. 2B). This genetic analysis confirmed the presence of a single recessive locus controlling the tiller inhibition trait within this population. Subsequently, we constructed a genetic map on Chr. 2B using a wheat 55 K single nucleotide polymorphism array. By combining recombinant analysis with the genotype and phenotype of the F2-3 family, we identified and named a major and novel locus, tiller inhibition gene (tin7), mapped within a 2.43 cM interval. The influence of tin7 was verified across six different background populations all sharing N2496 as a common parent. Using new recombinant lines from these six populations, we further narrowed down the interval of tin7 to a genetic interval of 2.08 cM. Analysis of thousand grain weight and grain-related traits suggests that by regulating tiller number, tin7 holds the potential to increase yield in wheat. Our research provides access to a novel tiller number locus and available markers for regulating tiller number, which could be used in developing new cultivars with an optimal number of tillers.

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