缺乏环丁烷嘧啶二聚体修复能力的紫外线B敏感水稻品种
Ultraviolet B-Sensitive Rice Cultivar Deficient in Cyclobutyl Pyrimidine Dimer Repair.
作者信息
Hidema J., Kumagai T., Sutherland J. C., Sutherland B. M.
机构信息
Institute of Genetic Ecology, Tohoku University, Katahira, Aoba, Sendai 980, Japan (J.H., T.K.).
出版信息
Plant Physiol. 1997 Jan;113(1):39-44. doi: 10.1104/pp.113.1.39.
Abstract
Repair of cyclobutyl pyrimidine dimers (CPDs) in DNA is essential in most organisms to prevent biological damage by ultraviolet (UV) light. In higher plants tested thus far, UV-sensitive strains had higher initial damage levels or deficient repair of nondimer DNA lesions but normal CPD repair. This suggested that CPDs might not be important for biological lesions. The photosynthetic apparatus has also been proposed as a critical target. We have analyzed CPD induction and repair in the UV-sensitive rice (Oryza sativa L.) cultivar Norin 1 and its close relative UV-resistant Sasanishiki using alkaline agarose gel electrophoresis. Norin 1 is deficient in cyclobutyl pyrimidine dimer photoreactivation and excision; thus, UV sensitivity correlates with deficient dimer repair.
摘要
在大多数生物体中，修复DNA中的环丁基嘧啶二聚体（CPD）对于防止紫外线（UV）造成的生物损伤至关重要。在迄今为止测试的高等植物中，对紫外线敏感的菌株具有较高的初始损伤水平或非二聚体DNA损伤修复缺陷，但CPD修复正常。这表明CPD可能对生物损伤并不重要。光合机构也被认为是一个关键靶点。我们使用碱性琼脂糖凝胶电泳分析了对紫外线敏感的水稻（Oryza sativa L.）品种Norin 1及其亲缘关系较近的抗紫外线品种Sasanishiki中CPD的诱导和修复情况。Norin 1在环丁基嘧啶二聚体光复活和切除方面存在缺陷；因此，对紫外线的敏感性与二聚体修复缺陷相关。
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