高等植物UV-B效应研究进展

Recent Advances of UVB Effects on Higher Plants

本文概述了植物 Ｕ Ｖ Ｂ效应近年来的研究进展。 Ｕ Ｖ Ｂ对植物生理过程的影响表现为抑制细胞伸长、降低光合作用、引起植物细胞内活性氧代谢的紊乱，膜脂过氧化作用增强。植物种间、种内都存在 Ｕ Ｖ Ｂ 敏感性差异。 Ｕ Ｖ Ｂ对植物 Ｄ Ｎ Ａ 的损伤主要是形成嘧啶二聚体。 Ｕ Ｖ Ｂ可诱导紫外吸收化合物的合成、积累，并对植物基因表达有重要调节作用。

Recent advances of UVB effects on higher plants were summarized in the present paper. Responses of higher plants to UVB radiation including growth inhibition, decrease of photosynthesis, disorder of the activated oxygen metabolism, and eventually leading to membrane lipid peroxidation. There were interspecific and intraspecific variation in sensitivity to UVB radiation. The main form of the DNA damage induced by UVB radiation was the formation of pyrimidine dimer. Accumulation of UVabsorbing compounds in plant tissue was induced by UVB radiation. Several plant genes expression regulated by UVB had been confirmed recently.