一氧化氮参与调节UV-B诱导的豌豆幼苗生长抑制(英文)

Nitric oxide involved in ultraviolet-B induced growth inhibition of pea seedlings

对豌豆幼苗5天生长期内紫外线-B(UV-B)辐射对豌豆茎伸长生长和一氧化氮(NO)释放率的影响进行了研究.实验结果表明,UV-B辐射促进了豌豆茎中的NO释放,同时抑制豌豆茎伸长生长;外源NO供体根际处理豌豆幼苗,与UV-B辐射的上述效应相似;而用NO清除剂(PTIO)处理豌豆幼苗会产生和UV-B辐射相反的效应,即增加了茎的伸长.由此可推测,NO也许作为信号参与调节UV-B辐射诱导的生长抑制.

The effects of ultraviolet-B （UV-B） radiation on stem elongation growth and the rate of nitric oxide （NO） release were evaluated in stems of pea （Pisum sativum L.） seedlings during a period of 5 days growth. The results indicated that UV-B radiation promoted NO release and led to the inhibition of pea stems elongation. Similarly, exogenous NO donation to the rhizospheric zone of pea seedlings imitated the responses of stems to UV-B radiation. NO scavenger （PTIO） had the opposite responses to UV-B radiation, such as increased stems elongation. NO might be involved in growth inhibition of pea seedlings induced by UV-B radiation.