Do temperate rainforest trees have a greater ability to acclimate to changing temperatures than tropical rainforest trees?
Do temperate rainforest trees have a greater ability to acclimate to changing temperatures than tropical rainforest trees?
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DOI：
10.1046/j.1469-8137.2003.00652.x
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发表时间：
2003-01-01
期刊：
影响因子：
9.4
通讯作者：
Read, J
中科院分区：
文献类型：
--
作者：
Cunningham, SC;Read, J
研究了8种澳大利亚雨林树种幼苗的光合作用对驯化温度的响应。澳大利亚热带雨林的纬度超过33度，为比较温带和热带物种的温度响应提供了机会。净光合作用是在恒定(22摄氏度：14摄氏度)或波动(17摄氏度：9摄氏度-27摄氏度)昼夜温度条件下发育的树叶的净光合作用。然后将这些叶片置于一系列恒温制度下，并在每种新制度驯化14d后测量净光合作用。驯化潜力不受不同温度制度的影响。温带树种在比热带树种更大的驯化温度范围内，表现出至少80%的最大净光合作用。温带树种缺乏对驯化潜力的影响，这可能反映了温带树种不需要调整，因为它已经对温度有广泛的光合作用反应，热带树种没有能力进行调整，或者总体来说，树种对平均温度机制而不是对机制的波动做出反应。温带物种表现出较高的驯化潜力，与热带气候相比，温带气候的季节变化和日变化较大是一致的。
Photosynthetic responses to acclimation temperature were investigated in seedlings of eight Australian rainforest tree species. Australian rainforests extend over 33degrees of latitude, providing an opportunity to compare temperature responses of temperate and tropical species.Net photosynthesis was measured in leaves developed under a constant (22degreesC : 14degreesC) or fluctuating (17degreesC : 9degreesC-27degreesC : 19degreesC) day/night temperature regime. These leaves were then subjected to a series of constant temperature regimes and net photosynthesis was measured 14 d after acclimation to each new regime.Acclimation potential was not affected by the contrasting temperature regimes. The temperate species showed at least 80% of maximum net photosynthesis over a larger span of acclimation temperature than the tropical species.The lack of an effect of the contrasting temperature regimes on acclimation potential may reflect either that adjustments were unnecessary for temperate species, which already have broad photosynthetic responses to temperature, and tropical species were incapable of adjustments, or that in general species respond to the mean temperature regime and not to the amount of fluctuation in the regime. The higher acclimation potential shown by the temperate species is consistent with the larger seasonal and day-to-day variation in temperature of the temperate climate compared with the tropical climate.