8/15/2023 0 Comments Isolator fitness high protein riceHigh mobility group proteins (HMG) play a key role in regulating these steps. Transcription control is one of the most important steps during plant drought stress response.Ĭhromatin/DNA structure rearrangement and transcription initiation are vital steps of gene expression regulation ( Agresti and Bianchi, 2003). Plants sense and respond to drought stress rapidly by transducing signals to cells, which activate the expression of several genes to resist stress ( Hirayama and Shinozaki, 2010). To enhance efficient water absorption and withstand drought stress, plants have adopted various strategies like osmotic adjustment, accumulating antioxidants, inducing stomatal closure (to reduce water loss), and developing a deep root system ( Dorothea and Ramanjulu, 2005 Muhammad et al., 2009). Elucidating the molecular mechanism underlying the drought tolerance in rice and deploying water-saving and drought-resistant rice varieties are effective methods for reducing crop production loss brought by frequent water shortages and drought stress. However, rice production requires more water input than most major crops like wheat and maize ( Luo, 2010). Rice is one of the most important crops globally in terms of production and consumption, alongside wheat and maize. In summary, OsHMGB707 encodes a stress-responsive high mobility group protein and regulates rice drought tolerance by promoting the expression of stress-related genes.ĭrought and water defects are key abiotic stresses that adversely affect agricultural production ( Torres and Henry, 2007). Some of the genes encode stress-related proteins (e.g., DREB transcription factors, heat shock protein 20, and heat shock protein DnaJ). Several genes were up-regulated in OsHMGB707-overexpression (OE) rice lines compared to the wild-type rice varieties. Notably, OsHMGB707-GFP is localized in the cell nucleus, and OsHMGB707 is protein-bound to the synthetic four-way junction DNA. Its overexpression significantly enhanced drought tolerance in transgenic rice plants, whereas its knockdown through RNA interference (RNAi) did not affect the drought tolerance of the transgenic rice plants. The expression of OsHMGB707 was up-regulated by dehydration and high salt treatment. In this study, we isolated a novel HMG gene, OsHMGB707, one of the candidate genes localized in the quantitative trait loci (QTL) interval of rice drought tolerance, and examined its function on rice stress tolerance. They play a crucial role in gene transcriptional regulation by modulating the chromatin/DNA structure. High mobility group (HMG) proteins are the second most abundant family of chromosomal proteins. In response, plants have evolved several strategies in which numerous genes are induced to counter stress. 2College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Chinaĭrought stress adversely affects crop growth and productivity worldwide.1Shanghai Agrobiological Gene Center, Shanghai, China.Kai Xu 1, Shoujun Chen 1,2, Tianfei Li 1, Shunwu Yu 1, Hui Zhao 1,2, Hongyan Liu 1* and Lijun Luo 1,2*
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