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Xiong Lizhong, a professor at Huazhong Agricultural University, published a research paper online in Molecular Plants, revealing that the new mechanism of histone mono-ubiquinin modification to finely regulate the drought response of rice is of great significance for exploring the molecular mechanism of plant drought resistance and the genetic improvement of drought resistance.
rice, as the main food crop and model plant of scientific research, is particularly important to improve its drought resistance to enhance the stable yield of grain production.
plant hormone ABA (shedding acid) plays an important role in plant adversity response, and ABA's signal transductivity is regulated by a variety of mechanisms. Previous studies by Xiong Lizhong's research show that OsbZIP46 is an important transcription factor involved in the transduction of rice ABA signal, and its function is significantly regulated by a key domain D, which can be interoperable with negative regulatory factor MODD and recruit related protein complexes, thereby inhibiting OsbZIP46 function.
study found that the E3 ubibin connective enzyme OsHUB2, which has the function of histone H2B monosulation, can be interoperated with OsbZIP46 and participate in ABA signal transduction and drought response as a positive regulator. The study also found that there was a dynamic change in H2B mono-ubibination modification during drought stress, which increased significantly after moderate drought stress and decreased in severe drought stress (relative to moderate stress). The reason for this dynamic change may be that MODD also has negative regulation over H2Bub1 modification: MODD can be modified by recruiting OsOTLD1 negative regulation of H2B single ubibination modification with histone H2B de-ubibinase activity.
this fine control mechanism has laid a good foundation for the follow-up in-depth study of rice anti-reverse molecular mechanism, and provided a new way of thinking for rice drought-resistant genetic improvement. (Source: Wang Fang, China Science Daily)
