ENVIRONMENTAL-INFLUENCES ON CARBON RECYCLING IN A TERRESTRIAL CAM BROMELIAD, BROMELIA-HUMILIS JACQ
ENVIRONMENTAL-INFLUENCES ON CARBON RECYCLING IN A TERRESTRIAL CAM BROMELIAD, BROMELIA-HUMILIS JACQ
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DOI：
10.1093/jxb/42.1.25
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发表时间：
1991-01-01
影响因子：
6.9
通讯作者：
LUTTGE, U
中科院分区：
文献类型：
--
作者：
FETENE, M;LUTTGE, U
研究了夜间温度、叶-气水汽压差和水分胁迫对矮凤梨CO2循环的影响。研究了在两种光照和氮制度下生长的。在夜间温度高于30摄氏度，综合净暗CO2吸收严重减少，苹果酸合成的CO2主要来自暗呼吸。在35 ℃时，高达84%的暗呼吸释放的二氧化碳被重新固定为苹果酸。低于30摄氏度，只有氮缺乏的植物表现出显着的再循环。在高光照和低光照下生长的植物在CO2再循环方面没有观察到显著差异。叶-空气VPD从7.46 Pa kPa-1到15.49 Pa kPa-1的加倍导致叶电导率降低2- 20倍，综合暗CO2吸收减少约50 - 65%。然而，约两倍的CO2在较高的VPD下的回收率较低。10天的水分胁迫导致80%至100%的呼吸CO2再循环。在高VPD和水分胁迫处理下，通过CO2再循环潜在节省的水量达到实际蒸腾量的2- 6倍。在一般情况下，氮缺乏的植物有较高的百分比呼吸CO2的再循环，以应对夜间高温，增加VPD或水分胁迫。这些结果强调了CAM植物中碳循环的生态相关性。
The effects of night-time temperature, leaf-to-air vapour pressure deficit (VPD) and water stress on CO2 recycling in Bromelia humilis Jacq. grown under two light and nitrogen regimes were investigated. At night-time temperatures above 30-degrees-C, integrated net dark CO2 uptake was severely reduced and CO2 for malate synthesis was mainly derived from dark respiration. At 35-degrees-C, up to 84% of the CO2 liberated by dark respiration was refixed into malic acid. Below 30-degrees-C only nitrogen deficient plants showed significant recycling. No significant differences were observed between high and low light grown plants in CO2 recycling. A doubling of leaf-to-air VPD from 7.46 Pa kPa-1 to 15.49 Pa kPa-1 resulted in a 2- to 20-fold decrease in leaf conductance and about 50 to 65% reduction in integrated dark CO2 uptake. However, about twice as much CO2 was recycled at the higher VPD as in the lower. Ten days of water stress resulted in 80 to 100% recycling of respiratory CO2. Under high VPD and water stress treatments, the amount of water potentially saved through recycling of CO2 reached 2- to 6-fold of the actual transpiration. In general, nitrogen deficient plants had higher per cent recycling of respiratory CO2 in response to high night-time temperature, increased VPD or water stress. The results emphasize the ecological relevance of carbon recycling in CAM plants.