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TaABI19 positively regulates grain development in wheat

作者：

Liu Yun-chuan;Wang Xiao-lu;Hao Chen-yang;Ahsan, Irshad;Li Tian;Liu Hong-xia;Hou Jian;Zhang Xue-yong

单位：

Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Inst Crop Sci, Natl Ctr Space Mutagenesis Crop Improvement, Beijing 100081, Peoples R China;Chinese Acad Agr Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Key Lab Biol & Genet Improvement Triticeae Crops, Minist Agr,Inst Crop Sci, Beijing 100081, Peoples R China;China Agr Univ, Coll Biol Sci, State Key Lab Plant Physiol & Biochem, Beijing 100193, Peoples R China;Chinese Acad Agr Sci, Inst Cotton Res, Anyang 455000, Peoples R China

关键词：

common wheat;transcription factor;haplotype;thousand-grain weight

摘要：

Starch is the most important component in the endosperm, and its synthesis is regulated by multiple transcription factors (TFs) in cereals. However, whether the functions of these TFs are conserved among cereals remains unclear. In this study, we cloned a B3 family TF in wheat, named TaABI19, based on its orthologous sequence in maize (Zea mays L.). Alignment of the DNA and protein sequences showed that ABI19 is conserved in maize and wheat (Triticum aestivum L.). We found that TaABI19 is highly expressed in young spikes and developing grains, and encodes a nucleus-localized transcriptional activator in wheat. The taabi19-b1 null mutants obtained by EMS exhibited a down-regulation of starch synthesis, shorter grain length and lower thousand-grain weight (TGW). Furthermore, we proved that TaABI19 could bind to the promoters of TaPBF homologous genes and enhance their expression. Haplotype association showed that TaABI19-B1 is significantly associated with TGW. We found that Hap2 and Hap3 were favored and had undergone positive selection in China's wheat breeding programs. Less than 50% of the modern cultivars convey the favored haplotypes, indicating that TaABI19 still can be considered as a target locus for marker-assisted selection breeding to increase TGW in China.

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TaABI19 positively regulates grain development in wheat

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