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Journal of Integrative Agriculture
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Identification and cloning of the TdBa controlling black awn color in durum wheat (Triticum durum Desf.)

Junna Sun1, Wei Pan1, Yuqi Zhang1, Wenxin Wei1, Nannan Liu1, Zuhuan Yang1, Jiarui Zhang1, Boyuan Zhang1, Jinying Gou1, Weilong Guo1, Qixin Sun1, Chaojie Xie1#, Jun Ma1#

State Key Laboratory of High-Efficiency Production of Wheat-Maize Double Cropping, Frontiers Science Center for Molecular Design Breeding, Key Laboratory of Crop Heterosis and Utilization (MOE), Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China

 Highlights 

The dominant gene TdBa controls the black awn phenotype on durum wheat Chr. 1AS.

Transgenic assays confirmed TRITD1Av1G000090’s role in awn coloration.

Microcolinearity and sequence data links TdBa to ancestral wheat species.

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摘要  

黑色素是一类广泛分布于生物体内的色素。硬粒小麦 (Triticum turgidum L. var. durum Desf.) 品种 Ofanto (Oft) 抽穗后麦芒逐渐由绿色变为黑色。利用Oft与黄芒硬粒小麦 Langdon 构建 F2 群体进行遗传分析表明,Oft 黑芒性状由一个显性基因控制,将其命名为 TdBa利用集群分离分析法(BSA)和连锁分析,将该基因定位于染色体 1AS 端粒与标记 1AS4.38 之间,对应 Svevo RefSeq v1.0  4.38 Mb 物理区间。区间包含 34 个注释基因,其中与水稻黑壳基因 OsBh4 和大麦黑壳/果皮基因 HvBlp 的同源基因 TRITD1Av1G000090,以及与水稻 PPO 编码基因 OsPhr1 的同源基因 TRITD1Av1G000270可能的两个候选基因。qRT-PCR 分析表明TRITD1Av1G000090 蜡熟期的芒中表达量显著升高,而 TRITD1Av1G000270 乳熟期和蜡熟期表达量无显著差异。转基因实验进一步表明,TRITD1Av1G000090 蜡熟期黑芒形成的关键基因。系统进化分析表明 TdBa 可能起源于一粒小麦



Abstract  

Melanins are a class of dark pigments widely distributed among living organisms. In cereal crops, the black husk-pericarp trait arises from melanin accumulation. The durum wheat (Triticum turgidum L. var. durum Desf.) cultivar Ofanto (Oft) exhibits black awns beginning at the soft dough stage. To identify the genetic loci associated with awn color, we analyzed an F2 population derived from a cross between Oft (black awn) and Langdon (LDN, yellow awn). Genetic mapping revealed a single dominant black awn gene, TdBa, located within an approximately 4.38 Mb interval on the short arm of chromosome 1AS. Among the 34 annotated genes located within this interval, TRITD1Av1G000090, which encodes amino acid transporters homologous to the rice black hull gene OsBh4 and barley black husk/pericarp gene HvBlp, was identified as a candidate gene based on sequence, expression, and gene function prediction analyses. In contrast to its homologous genes OsBh4 and HvBlp, TdBa causes only black awn in wheat. The role of TRITD1Av1G000090 in awn coloration was subsequently confirmed through transgenic assays.

Keywords:  black awn       durum wheat       TdBa  
Online: 10 March 2026  
Fund: 

This research was supported by National Key Research and Development Program of China (2023YFD2301500).

About author:  Junna Sun, E-mail: sjn4740@163.com; #Correspondence Jun Ma, E-mail: junma@cau.edu.cn; Chaojie Xie, E-mail: xiecj127@126.com

Cite this article: 

Junna Sun, Wei Pan, Yuqi Zhang, Wenxin Wei, Nannan Liu, Zuhuan Yang, Jiarui Zhang, Boyuan Zhang, Jinying Gou, Weilong Guo, Qixin Sun, Chaojie Xie, Jun Ma. 2026. Identification and cloning of the TdBa controlling black awn color in durum wheat (Triticum durum Desf.). Journal of Integrative Agriculture, Doi:10.1016/j.jia.2026.03.021

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