数字农科院2.0

Identification And Molecular Mapping Of I.ndica High-Tillering Dwarf Mutant H td4, A Mild Phenotype Allelic Mutant Of D14 In Rice (Oryza Sativa L.)

文献类型： 外文期刊

作者： Wang, YP; Tang, SQ; Chen, HZ; Wu, ZF; Zhang, H; Duan, EC; Shi, QH; Wu, ZM

作者机构：

关键词： D14; dwarf; fine mapping; high tillering; Oryza sativa; strigolactones (SLs)

期刊名称： PLANT BIOLOGY

ISSN： 1435-8603

年卷期： 2017 年 19 卷 6 期

页码：

收录情况： JCR（2021版）

摘要： Metabolism of strigolactones (SLs) can improve the efficiency of nutrient use by regulating the development of roots and shoots in crops, making them an important research focus for molecular breeding. However, as a very important plant hormone, the molecular mechanism of SL signal transduction still remains largely unknown. In this study, we isolated an indica high-tillering dwarf mutant 4 (htd4), a spontaneous mutant of rice, from the restorer line Gui99. Mapping and sequencing analysis showed that htd4 was a novel allelic mutant of D14, in which a single base substitution forms a premature termination codon. Quantitative RT-PCR analyses revealed that expression levels of the genes D10, D17, D27, D3 and D14 increased significantly, while expression of D53 decreased in htd4, compared with the wild type. A subcellular localisation assay showed that the mutant of D14 in htd4 did not disturb the normal localisation of D14 proteins. However, a BiFC assay suggested that the mutant-type D14 could not interact with D3. Additionally, compared with other D14 allelic mutants, htd4 was the first mutant of D14 discovered in indica, and the differences in many yield traits such as plant height, seed-setting rate and grain sizes between htd4 and the wild type were less than those between other D14 allelic mutants and the wild type. Therefore, htd4 is considered a mild phenotype allelic mutant of D14. We conclude that the absence of functional D14 caused the high-tillering dwarf phenotype of htd4. Our results may provide vital information for research on D14 function and the application of htd4 in molecular breeding.

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