Recently, the team of Wang Jinfa and Wang Hongbin of the School of Life Sciences of Sun Yat-sen University have made new progress in the study of the physiological function of the chloroplast redox regulation system. The two research results were published online in The Plant Journal and Plant Physiology Both Liu Jun and Wang Peng are co-first authors, and Professor Wang Hongbin is the corresponding author.
Chloroplast is the place where plant cells carry out photosynthesis, and its normal development is the prerequisite for plants to carry out photosynthesis. Photosynthesis involves a series of redox reactions, in which Fd (ferredoxin), FTR (ferredoxin-thioredoxin reductase) and TRX (thioredoxin) at the end of the photosynthetic electron transport chain are combined A special Fd-FTR-TRX redox system unique to photosynthetic autotrophic organisms has been developed. This system can convert electrical signals generated by photosynthesis photosynthesis into biochemical energy to provide power for fixed carbon dioxide. However, the specific regulatory function of the Fd-FTR-TRX redox system in plant growth and development is still unclear.
The research group found that Fd2 (ferredoxin 2) and TRX m (m class thioredoxin) adapt to strong light stress in plants and PSII (photosynthetic system II) in plants through the study of Fd-FTR-TRX redox system. ) Play an important role in the biogenesis of complexes. Studies on Arabidopsis Fd2 deletion mutants have shown that under long-term strong light stress, plants can promote various photoprotective mechanisms in the chloroplast (including plastid redox signals and ring-shaped electron transfer, etc.) by down-regulating Fd2 expression levels. ), So as to achieve the adaptation of plants to adversity. The research results were published online in The Plant Journal (DOI: 10.1111 / tpj.12341) on October 7.
At the same time, the virus-induced gene silencing technology (VIGS technology) of the Arabidopsis TRX m gene family found that the family members TRX m1, TRX m2 and TRX m4 regulate the oligomerization of the PSII complex protein subunit through oxygen , And participate in the regulation of PSII complex biogenesis and chloroplast development. The research results were published online in Plant Physiology (DOI: 10.1104 / pp.113.228353) on October 22.
The above research not only helps to better understand the regulation function of oxygen mediated by photosynthetic electron transfer in chloroplast development, but also provides new ideas for exploring the practical application of improving the photosynthesis efficiency of crops. Related work was supported by the National Natural Science Foundation of China and the Guangdong Natural Science Foundation.
This is another important progress made by the research group in plant stress biology. In 2012, the research group discovered the dual natural immune receptors for rice to recognize fungi and bacteria. Related research results were published in The Plant Cell, an authoritative journal in the field of botany in August 2012, and the latest ESI database was published in September 2013 Among them, was selected as the global ESI hot papers in the last 2 years.
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