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Scientists reveal the catabolism mechanism of plant hormone strigolactone |
On November 12, the team of Hu Yuxin, a researcher at the Institute of Botany , Chinese Academy of Sciences, published the latest research results in Nature-Plants.
They found that AtCXE15, a member of the Arabidopsis carboxylesterase family, and its orthologous protein are a kind of stratophyte.
The key enzyme of ester catabolism
.
Strigolactone is a type of plant hormone derived from carotenoids, which plays an important role in regulating plant branching, promoting symbiosis between plants and arbuscular mycorrhizal fungi, and inducing root parasitic plant seed germination
.
The metabolism of strigolactone and its mechanism of action is one of the important research fields in plant developmental biology in recent years
The researchers found that the expression of AtCXE15 in root and stem explants showed completely opposite response patterns to auxin
.
Overexpression of AtCXE15 gene in Arabidopsis can significantly increase the number of branches, and this increase in the number of branches is caused by the lack of strigolactone in the body
Through further research, they found that AtCXE15 can bind to and efficiently hydrolyze different types of strigolactone molecules in vivo and in vitro.
In addition, AtCXE15 has the same direct effects in dicotyledonous plants such as alfalfa and soybean, monocotyledonous rice and gymnosperm gemini.
The function of the source protein is highly conserved
.
Interestingly, different from strigolactone synthesis and signal genes, AtCXE15 transcription level is regulated by strigolactone and a variety of external environmental signals, which suggests that CXE15-mediated strigolactone homeostasis may be a plant A mechanism that integrates environmental signals and branch development
.
This study reveals a new mechanism of plant strigolactone catabolism and homeostasis regulation, and provides a new strategy for optimizing crop and ornamental plant types by manipulating the distribution of strigolactone in the body through time and space
.
Xu Enjun, an assistant researcher at the Institute of Botany, Chinese Academy of Sciences, is the first author of the paper, and Hu Yuxin is the corresponding author
.
This research was funded by the Strategic Pilot Project of the Chinese Academy of Sciences and the National Natural Science Foundation of China
Chinese Academy of Sciences Chinese Academy of Sciences Chinese Academy of Sciences
Related paper information: https://doi.
https://doi.
org/10.
1038/s41477-021-01011-y