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Precise tiller angle control by manipulating TAC1 expression in rice

文献类型： 外文期刊

作者： Yin, Tao 1 ; Tai, Yuxin 1 ; Sun, Yao 1 ; Cheng, Zixiang 1 ; Wu, Chuanyin 1 ; Sui, Yi 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, State Key Lab Crop Gene Resources & Breeding, Beijing 100081, Peoples R China

2.Shandong Acad Agr Sci, Inst Wetland Agr & Ecol, Shandong Rice Engn Technol Res Ctr, Jinan 250100, Peoples R China

关键词： genome editing; plant architecture; rice; TAC1; tiller angle

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.3； 五年影响因子：10.8 ）

ISSN： 1672-9072

年卷期： 2025 年 67 卷 6 期

页码：

收录情况： SCI

摘要： Tiller angle shapes plant architecture, and is one of the top traits in plant breeding. A compact plant type reduces shading between plants, especially at high planting density, but also creates a humid microenvironment often associated with a higher incidence of pathogen and pest attacks, especially under highly humid climates. However, how to precisely manipulate the tiller angle to achieve a desirable plant type has been under-approached. Here we report the creation of gradient tiller angles in indica rice by fine tuning the expression of TILLER ANGLE CONTROL1 (TAC1), a domesticated gene in cultivated rice. We edited the regions upstream and downstream of the TAC1 coding sequence using multiplex CRISPR-Cas9 technology and developed homozygous allelic lines carrying deletions/inversions of various sizes at different positions. Those lines displayed smooth gradient changes in tiller angle that aligned well with TAC1 expression levels. Additionally, changes in the TAC1 expression level had no impact on other agronomic traits examined. TAC1 is well conserved across species, including perennial fruit trees in which mutation of TAC1 orthologs leads to a broomy plant type. Thus, our results provide a guide to creating tiller angles for selection according to climate zones in rice breeding programs, this approach can be extended to diverse species for improving plant architecture.

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