Evergreen leaf respiration acclimates to long-term nocturnal warming under field conditions
Evergreen leaf respiration acclimates to long-term nocturnal warming under field conditions
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DOI：
10.1111/j.1365-2486.2007.01351.x
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发表时间：
2007-06-01
影响因子：
11.6
通讯作者：
Ball, Marilyn C.
中科院分区：
文献类型：
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作者：
Bruhn, Dan;Egerton, John J. G.;Ball, Marilyn C.
植物呼吸速率（R）对气候变暖的适应变化很大，许多结果似乎相互矛盾。我们测试了最近提出的假设，即预先存在的，长寿的叶子应该表现出相对有限的能力R适应气候变暖，驯化将发生通过呼吸的短期温度敏感性的变化。亚高山万年青树种（少花桉）的幼苗在其自然分布范围内的自然波动条件下生长。我们使用红外陶瓷灯的自由空气温度增加（FATI）系统，将夜间叶温提高0.3 +/- 0.1，1.3 +/- 0.1和2.2 +/- 0.1摄氏度，持续1年。光饱和同化率和植物生长没有改变夜间FATI治疗。叶R在现行温度下测量没有不同的FATI治疗。在每个FATI治疗，夜间叶R是高度敏感的人工温度变化在几分钟内，也与自然夜间和季节性温度变化密切相关。R的Q（10）的相应值根据测量的时间尺度而变化，但在FATI治疗之间没有变化。相反，驯化的R夜间FATI发生通过呼吸的基础速率的变化。
Acclimation of plant respiration rates (R) to climate warming is highly variable and many results appear contradictory. We tested the recently suggested hypotheses that pre-existing, long-lived leaves should exhibit a relatively limited ability for R to acclimate to climate warming, and that acclimation would occur via changes in the short-term temperature sensitivity of respiration. Seedlings of a subalpine, evergreen tree species (Eucalyptus pauciflora) were grown under naturally fluctuating conditions within its natural distribution. We used a free air temperature increase (FATI) system of infra-red ceramic lamps to raise night-time leaf temperatures by 0.3 +/- 0.1, 1.3 +/- 0.1, and 2.2 +/- 0.1 degrees C above ambient for 1 year. Light-saturated assimilation rates and plant growth did not change with nocturnal FATI treatments. Leaf R measured at prevailing temperatures did not differ between FATI treatments. Within each FATI treatment, nocturnal leaf R was highly sensitive to artificial temperature changes within minutes, and also correlated strongly with natural nocturnal and seasonal temperature variation. The corresponding values of Q(10) of R varied according to time scale of measurements, but did not vary between FATI treatments. Instead, acclimation of R to nocturnal FATI occurred through changes in the base rate of respiration.