Wheat wounding-responsive HD-Zip IV transcription factor GL7 is predominantly expressed in grain and activates genes encoding defensins

Plant Molecular Biology - Tập 101 - Trang 41-61 - 2019
Nataliya Kovalchuk1, Wei Wu1,2, Natalia Bazanova1,3, Nicolas Reid1, Rohan Singh1, Neil Shirley1, Omid Eini4, Alexander A. T. Johnson5, Peter Langridge1, Maria Hrmova1,6, Sergiy Lopato1
1School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, Australia
2Agronomy College, Sichuan Agricultural University, Ya’an, China
3Commonwealth Scientific and Industrial Research Organisation, Glen Osmond, Australia
4Department of Plant Protection, School of Agriculture, University of Zanjan, Zanjan, Iran
5School of BioSciences, The University of Melbourne, Melbourne, Australia
6School of Life Sciences, Huaiyin Normal University, Huai’an, China

Tóm tắt

Several classes of transcription factors are involved in the activation of defensins. A new type of the transcription factor responsible for the regulation of wheat grain specific defensins was characterised in this work. HD-Zip class IV transcription factors constitute a family of multidomain proteins. A full-length cDNA of HD-Zip IV, designated TaGL7 was isolated from the developing grain of bread wheat, using a specific DNA sequence as bait in the Y1H screen. 3D models of TaGL7 HD complexed with DNA cis-elements rationalised differences that underlined accommodations of binding and non-binding DNA, while the START-like domain model predicted binding of lipidic molecules inside a concave hydrophobic cavity. The 3′-untranslated region of TaGL7 was used as a probe to isolate the genomic clone of TdGL7 from a BAC library prepared from durum wheat. The spatial and temporal activity of the TdGL7 promoter was tested in transgenic wheat, barley and rice. TdGL7 was expressed mostly in ovary at fertilisation and its promoter was active in a liquid endosperm during cellularisation and later in the endosperm transfer cells, aleurone, and starchy endosperm. The pattern of TdGL7 expression resembled that of genes that encode grain-specific lipid transfer proteins, particularly defensins. In addition, GL7 expression was upregulated by mechanical wounding, similarly to defensin genes. Co-bombardment of cultured wheat cells with TdGL7 driven by constitutive promoter and seven grain or root specific defensin promoters fused to GUS gene, revealed activation of four promoters. The data confirmed the previously proposed role of HD-Zip IV transcription factors in the regulation of genes that encode lipid transfer proteins involved in lipid transport and defence. The TdGL7 promoter could be used to engineer cereal grains with enhanced resistance to insects and fungal infections.

Tài liệu tham khảo

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