Soybean GmPHD-Type Transcription Regulators Improve Stress Tolerance in Transgenic Arabidopsis Plants

Abstract

BACKGROUND Soybean [Glycine max (L.) Merr.] is one of the most important crops for oil and protein resource. Improvement of stress tolerance will be beneficial for soybean seed production. PRINCIPAL FINDINGS Six GmPHD genes encoding Alfin1-type PHD finger protein were identified and their expressions differentially responded to drought, salt, cold and ABA treatments. The six GmPHDs were nuclear proteins and showed ability to bind the cis-element "GTGGAG". The N-terminal domain of GmPHD played a major role in DNA binding. Using a protoplast assay system, we find that GmPHD1 to GmPHD5 had transcriptional suppression activity whereas GmPHD6 did not have. In yeast assay, the GmPHD6 can form homodimer and heterodimer with the other GmPHDs except GmPHD2. The N-terminal plus the variable regions but not the PHD-finger is required for the dimerization. Transgenic Arabidopsis plants overexpressing the GmPHD2 showed salt tolerance when compared with the wild type plants. This tolerance was likely achieved by diminishing the oxidative stress through regulation of downstream genes. SIGNIFICANCE These results provide important clues for soybean stress tolerance through manipulation of PHD-type transcription regulator.

DOI: 10.1371/journal.pone.0007209

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@inproceedings{Wei2009SoybeanGT, title={Soybean GmPHD-Type Transcription Regulators Improve Stress Tolerance in Transgenic Arabidopsis Plants}, author={Wei Wei and Jian Huang and Yu-Jun Hao and Hong-Feng Zou and Hui-wen Wang and Jing-Yun Zhao and Xue-yi Liu and Wan-Ke Zhang and Biao Ma and Jin-Song Zhang and Shou-yi Chen}, booktitle={PloS one}, year={2009} }