Tiller Number1 encodes an ankyrin repeat protein that controls tillering in bread wheat

Chunhao Dong, Lichao Zhang, Qiang Zhang, Yuxin Yang, Danping Li, Zhencheng Xie, Guoqing Cui, Yaoyu Chen, Lifen Wu, Zhan Li, Guoxiang Liu, Xueying Zhang, Cuimei Liu, Jinfang Chu, Guangyao Zhao, Chuan Xia, Jizeng Jia, Jiaqiang Sun (), Xiuying Kong () and Xu Liu ()
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Chunhao Dong: Chinese Academy of Agricultural Sciences
Lichao Zhang: Chinese Academy of Agricultural Sciences
Qiang Zhang: Chinese Academy of Agricultural Sciences
Yuxin Yang: Chinese Academy of Agricultural Sciences
Danping Li: Chinese Academy of Agricultural Sciences
Zhencheng Xie: Chinese Academy of Agricultural Sciences
Guoqing Cui: Chinese Academy of Agricultural Sciences
Yaoyu Chen: Chinese Academy of Agricultural Sciences
Lifen Wu: Chinese Academy of Agricultural Sciences
Zhan Li: Chinese Academy of Agricultural Sciences
Guoxiang Liu: Chinese Academy of Agricultural Sciences
Xueying Zhang: Chinese Academy of Agricultural Sciences
Cuimei Liu: Chinese Academy of Sciences
Jinfang Chu: Chinese Academy of Sciences
Guangyao Zhao: Chinese Academy of Agricultural Sciences
Chuan Xia: Chinese Academy of Agricultural Sciences
Jizeng Jia: Chinese Academy of Agricultural Sciences
Jiaqiang Sun: Chinese Academy of Agricultural Sciences
Xiuying Kong: Chinese Academy of Agricultural Sciences
Xu Liu: Chinese Academy of Agricultural Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Wheat (Triticum aestivum L.) is a major staple food for more than one-third of the world’s population. Tiller number is an important agronomic trait in wheat, but only few related genes have been cloned. Here, we isolate a wheat mutant, tiller number1 (tn1), with much fewer tillers. We clone the TN1 gene via map-based cloning: TN1 encodes an ankyrin repeat protein with a transmembrane domain (ANK-TM). We show that a single amino acid substitution in the third conserved ankyrin repeat domain causes the decreased tiller number of tn1 mutant plants. Resequencing and haplotype analysis indicate that TN1 is conserved in wheat landraces and modern cultivars. Further, we reveal that the expression level of the abscisic acid (ABA) biosynthetic gene TaNCED3 and ABA content are significantly increased in the shoot base and tiller bud of the tn1 mutants; TN1 but not tn1 could inhibit the binding of TaPYL to TaPP2C via direct interaction with TaPYL. Taken together, we clone a key wheat tiller number regulatory gene TN1, which promotes tiller bud outgrowth probably through inhibiting ABA biosynthesis and signaling.

Date: 2023
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DOI: 10.1038/s41467-023-36271-z

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