Peiser G D, Yang S F
Department of Vegetable Crops, University of California, Davis, California 95616.
Plant Physiol. 1979 Jan;63(1):142-5. doi: 10.1104/pp.63.1.142.
After alfalfa (Medicago sativa) seedlings were exposed to approximately 0.7 microliter per liter SO(2) for 8 hours, elevated ethylene and ethane production was observed. Ethylene production peaked about 6 hours and returned to control levels by about 24 hours following the fumigation, while ethane production peaked about 36 hours and was still above control levels 48 hours after the fumigation. Light had an opposite effect upon the production of the two gases: ethane production rates were higher from plants held in light, whereas ethylene production rates were higher from those held in the dark. Peak ethylene and ethane production rates from SO(2)-treated plants were about 10 and 4 to 5 times greater, respectively, than those of the control plants. Ethylene appeared to be formed primarily from stressed yet viable leaves and ethane from visibly damaged leaves. The different time courses and light requirements for ethylene and ethane production suggest that these two gases were formed via different mechanisms. Light appears to have a dual role. It enhances SO(2)-induced cellular damage and plays a role for repairs.
苜蓿（紫花苜蓿）幼苗暴露于约0.7微升/升的二氧化硫中8小时后，观察到乙烯和乙烷的产量增加。熏蒸后约6小时乙烯产量达到峰值，约24小时后恢复到对照水平，而乙烷产量在约36小时达到峰值，熏蒸后48小时仍高于对照水平。光照对这两种气体的产生有相反的影响：光照下的植物乙烷产生速率较高，而黑暗中的植物乙烯产生速率较高。经二氧化硫处理的植物乙烯和乙烷的峰值产生速率分别比对照植物高约10倍和4至5倍。乙烯似乎主要由受胁迫但仍存活的叶片形成，乙烷则由明显受损的叶片形成。乙烯和乙烷产生的不同时间进程和光照需求表明这两种气体是通过不同机制形成的。光照似乎具有双重作用。它增强了二氧化硫诱导的细胞损伤并在修复中发挥作用。
