期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/ijms21218120
关键词
leaf senescence; DNA damage; ATM; fertility; SATMF
资金
- National Natural Science Foundation of China [31970196, 31570286, 31900173]
- Chinese Postdoctoral Science Foundation [2019M650514, 2019M650516, 2020M670544]
- Shenzhen Science and Technology Program [KQTD20190929173906742]
- National Key Research and Development Program of China [2019YFA0903904]
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University
Leaf senescence is the final stage of leaf development. It is accompanied by the remobilization of nutrients from senescent leaves to developing organs. The occurrence of senescence is the consequence of integrating intrinsic and environmental signals. DNA damage triggered by stresses has been regarded as one of the reasons for senescence. To prevent DNA damage, cells have evolved elaborate DNA repair machinery. The ataxia telangiectasia mutated (ATM) functions as the chief transducer of the double-strand breaks (DSBs) signal. Our previous study suggests that ATM functions in lifespan regulation in Arabidopsis. However, ATM regulatory mechanism on plant longevity remains unclear. Here, we performed chemical mutagenesis to identify the components involved in ATM-mediated longevity and obtained three dominant mutants satmf1 similar to 3, suppressor of atm in fertility, displaying delayed senescence and restored fertility in comparison with atm mutant. Molecular cloning and functional analysis of SATMF (suppressor of atm in fertility) will help to understand the underlying regulatory mechanism of ATM in plants, and shed light on developing new treatments for the disease Ataxia-telangiectasia.
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