Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study
Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study
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沙漠和山地植物光合热耐受性和对短期温度胁迫的恢复：比较研究
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发表时间：
2014
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通讯作者：
David W. Gallagher
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作者：
David W. Gallagher
版权所有III委员会成员标题：沙漠和山地植物的光合热耐受性和对短期温度胁迫的恢复：比较研究作者：IV沙漠和山地植物的光合作用热耐性和对短期温度胁迫的恢复：比较研究·气候变化模型预测包括热浪在内的极端天气事件的频率和幅度增加。为了更好地预测植物组合的组成和分布如何对这些温度变化做出反应，了解物种目前如何对这些极端情况做出反应是很重要的。对27种植物的光合热耐性(T25)和光合作用恢复(RT25)进行了量化。研究了T25、RT25与单位面积叶质量(LMA)的关系。田间还进行了叶温监测。·本研究中使用的叶子来自代表沙漠和山地植物组合的两个不同环境。T25和RT25采用结合亚饱和光和短时热胁迫的叶绿素荧光方案进行测量。·平均T25和LMA在不同环境之间有显著差异。平均RT25在不同环境之间没有显著差异。在两种环境中，T25与LMA均呈正相关。·在夏季的几个月里，经历了截然不同的平均最高气温的两个生态圈，从热应激中恢复的能力并没有什么不同。LMA是一个预测叶片耐热性的性状。作者感谢博伊德深峡谷沙漠研究中心提供的场地接入、基础设施、植物标本馆和一个实验室，以及该中心主任艾伦·穆斯博士。我们还感谢金·布里奥内斯和特拉维斯·帕克在实地提供的援助以及马克·费舍尔提供的技术援助。此外，我们感谢Buford Crites和沙漠之友进入圣罗萨山小屋。
ALL RIGHTS RESERVED iii COMMITTEE MEMBERSHIP TITLE: Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study AUTHOR: iv ABSTRACT Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study • Climate change models predict an increase in frequency and amplitude of extreme weather events, including heat waves. To better predict how the composition and distribution of plant assemblages might respond to these changes in temperature, it is important to understand how species currently respond to these extremes. Photosynthetic thermal tolerance (T 25) and photosynthetic recovery (RT 25) were quantified in 27 species. We also studied the relationships between T 25 , RT 25 and leaf mass per area (LMA). Leaf temperature was also monitored in the field. • Leaves used in this study were collected from two distinct environments representing desert and montane plant assemblages. T 25 and RT 25 were measured using a chlorophyll fluorescence protocol incorporating sub-saturating light and short duration heat stress. • Mean T 25 and LMA were significantly different between environments. Mean RT 25 was not significantly different between environments. There was a positive relationship between T 25 and LMA in both environments. • The ability to recover from heat stress does not differ between two biomes that experience vastly different mean maximum temperatures during the summer months. LMA is a predictive leaf trait for thermal tolerance. v ACKNOWLEDGMENTS The author gratefully acknowledges Boyd Deep Canyon Desert Research Center for site access, infrastructure, herbarium, and a laboratory as well as its director, Dr. Allan Muth. We further thank Kim Briones and Travis Parker for assistance in the field and Mark Fisher for technical assistance. Also, we thank Buford Crites and Friends of the Desert Mountains for access to the Santa Rosa Mountain cabin.