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Identification of GT Factors in Response to Stresses and Leaf Senescence in Gossypium hirsutum L.

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Abstract

GT factors, also called trihelix transcription factors (TFs), belong to a small family of TFs and were first discovered because of their unique binding to GT elements. Recent studies have demonstrated the functions of GT factors in plant development and stress. Cotton is a major source of fiber and oilseed. However, studies about the GT factors in cotton are limited, especially with regard to their function and evolution. Therefore, it is important to study the GT factors in cotton. This study was based on three genome databases of cotton (A, D, and AD) and the GT factors in Arabidopsis. We retrieved 39 putative GhGT genes in Gossypium hirsutum, 14 GaGT in G. arboreum, and 14 GrGT in G. raimondii. For 39 GhGT genes, we characterized their motif features, domain sequence alignments, and phylogenetic relationship with other species. To understand the functions of GT factors in the senescent cotton leaves, we isolated eight GhGT genes from yellow leaves. In addition, we detected the expression patterns of these eight genes in that particular tissue as well as their effects on fiber development and responses to stresses and plant hormones, especially in leaf development, using real-time quantitative PCR. In addition, we also studied the function of GhGT31 in Arabidopsis. The results not only laid the foundation for an understanding of the functions of the GT factors in cotton but also provided significant information about the effects of GT factors on cotton development and on the responses to various stresses.

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Acknowledgments

We thank The National High Technology Research and Development Program of China (Grant No. 2013AA102601) for the financial support provided to this project.

Author's contributions

SXY, SLF, CYP, and MZS designed the experiments. HLW collected all the sequences, YNG performed the experiments and wrote the manuscript, and LLD helped in analyzing the data. CYP and OE revised the language. All the authors read and approved the final manuscript.

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Correspondence to Shuxun Yu.

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The authors declare that they have no conflict of interest.

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Supplementary Fig. 1 Conserved domains multiple alignments of 39 GhGT factors through DNAMAN software

Supplementary Fig. 2 MDA content of cotyledons of CCRI10 and Liao4086 during leaf senescence

Supplementary Fig. 3 Chlorophyll content of cotyledon and true leaf during aging

Supplementary Fig. 4 Soluble protein content of CCRI10 and Liao4086 during leaf senescence

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Guo, Y., Dou, L., Evans, O. et al. Identification of GT Factors in Response to Stresses and Leaf Senescence in Gossypium hirsutum L.. J Plant Growth Regul 36, 22–42 (2017). https://doi.org/10.1007/s00344-016-9619-9

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  • DOI: https://doi.org/10.1007/s00344-016-9619-9

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