Close Dugald C, Beadle Chris L, Hovenden Mark J
Cooperative Research Centre for Sustainable Production Forestry, GPO Box 252-12, Hobart 7001, Australia.
Oecologia. 2003 Jan;134(1):32-6. doi: 10.1007/s00442-002-1097-z. Epub 2002 Nov 9.
Eucalyptus nitens is a species that is adapted to low temperature. This study examines xanthophyll-cycle engagement in E. nitens seedlings exposed to cold-induced photoinhibitory conditions under different levels of irradiance and nutrient status. Xanthophyll-cycle pool size indicated an increased requirement for light energy dissipation under high irradiance and low nutrient status. Greater sensitivity to photoinhibition of non-shaded seedlings indicated that sustained xanthophyll-cycle engagement may occur in response to damaged chlorophyll. Within irradiance treatments, fertilised seedlings had higher photochemical efficiency and faster recovery from photoinhibition than unfertilised seedlings. These results demonstrate that fertilised compared to unfertilised seedlings can utilise a greater proportion of incident light under cold temperature conditions
细叶桉是一种适应低温的物种。本研究考察了在不同光照强度和养分状况下，处于冷诱导光抑制条件的细叶桉幼苗中叶黄素循环的参与情况。叶黄素循环库大小表明，在高光照强度和低养分状况下，对光能耗散的需求增加。未遮荫幼苗对光抑制更敏感，这表明叶黄素循环持续参与可能是对受损叶绿素的响应。在光照处理中，施肥的幼苗比未施肥的幼苗具有更高的光化学效率，且从光抑制中恢复得更快。这些结果表明，与未施肥的幼苗相比，施肥的幼苗在低温条件下能够利用更大比例的入射光。
