UV-Induced Cell Death in Plants

被引:176
|
作者
Nawkar, Ganesh M.
Maibam, Punyakishore
Park, Jung Hoon
Sahi, Vaidurya Pratap
Lee, Sang Yeol [1 ]
Kang, Chang Ho
机构
[1] Gyeongsang Natl Univ, Div Appl Life Sci, Program BK21, Jinju 660701, South Korea
基金
新加坡国家研究基金会;
关键词
UV radiation; reactive oxygen species (ROS); cell death; ULTRAVIOLET-B RADIATION; NUCLEOTIDE EXCISION-REPAIR; TRANSCRIPTION FACTOR HY5; MAP KINASE PHOSPHATASE; CASPASE-LIKE PROTEASES; GENE-EXPRESSION; INDUCED PHOTOMORPHOGENESIS; TERRESTRIAL ECOSYSTEMS; ARABIDOPSIS-THALIANA; SIGNAL-TRANSDUCTION;
D O I
10.3390/ijms14011608
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Plants are photosynthetic organisms that depend on sunlight for energy. Plants respond to light through different photoreceptors and show photomorphogenic development. Apart from Photosynthetically Active Radiation (PAR; 400-700 nm), plants are exposed to UV light, which is comprised of UV-C (below 280 nm), UV-B (280-320 nm) and UV-A (320-390 nm). The atmospheric ozone layer protects UV-C radiation from reaching earth while the UVR8 protein acts as a receptor for UV-B radiation. Low levels of UV-B exposure initiate signaling through UVR8 and induce secondary metabolite genes involved in protection against UV while higher dosages are very detrimental to plants. It has also been reported that genes involved in MAPK cascade help the plant in providing tolerance against UV radiation. The important targets of UV radiation in plant cells are DNA, lipids and proteins and also vital processes such as photosynthesis. Recent studies showed that, in response to UV radiation, mitochondria and chloroplasts produce a reactive oxygen species (ROS). Arabidopsis metacaspase-8 (AtMC8) is induced in response to oxidative stress caused by ROS, which acts downstream of the radical induced cell death (AtRCD1) gene making plants vulnerable to cell death. The studies on salicylic and jasmonic acid signaling mutants revealed that SA and JA regulate the ROS level and antagonize ROS mediated cell death. Recently, molecular studies have revealed genes involved in response to UV exposure, with respect to programmed cell death (PCD).
引用
收藏
页码:1608 / 1628
页数:21
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