Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth.
Timing Effects of Heat-Stress on Plant Ecophysiological Characteristics and Growth.
复制标题
热应激对植物生态生理特性和生长的时间效应
DOI：
10.3389/fpls.2016.01629
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发表时间：
2016
影响因子：
5.6
通讯作者：
Tripathee R
中科院分区：
文献类型：
--
作者：
Wang D;Heckathorn SA;Mainali K;Tripathee R
由于全球气候变暖，预计未来将出现强度更高、频率更高、持续时间更长的热浪，这将对农业、经济和生态产生巨大影响。本研究探讨了植物在不同时间对热胁迫（HS）处理的反应。HS处理（在40.5°C下5天）被施加到12 1平方米的恢复草原植被占主导地位的暖季型C4草，Andropogon gerardii，和暖季型C3杂类，加拿大一枝黄花，在不同的生长阶段的地块。在每次热胁迫（HS）处理期间和之后，监测空气、冠层和土壤的温度;测量净CO2同化（Anet）、光系统II的量子产额（ΦPSII）、气孔导度（gs）、内部CO2水平（Ci）、比叶面积（SLA）和优势种的叶绿素含量。在最后一次HS处理后一周，收获所有样地，并测定两种优势种的地上组织生物量和花重。HS降低了两个物种的生理性能和生长，S。canadensis比A.结果表明，HS对S. gerardii的生理和生长反应均有负效应。canadensis。HS对两种植物的影响存在明显的时间效应，生长季后期施用HS对两种植物的净光合速率和生产力的影响较大。S. canadensis而不是A. gerardii可能通过增加A.在这片草原上。目前的实验表明，HS，虽然短暂的，可能会促进长期影响植物群落结构，植被动态，生物多样性和陆地生物群落的生态系统功能时，更频繁和严重的HS发生在未来。
Heat-waves with higher intensity and frequency and longer durations are expected in the future due to global warming, which could have dramatic impacts in agriculture, economy and ecology. This field study examined how plant responded to heat-stress (HS) treatment at different timing in naturally occurring vegetation. HS treatment (5 days at 40.5°C) were applied to 12 1 m2 plots in restored prairie vegetation dominated by a warm-season C4 grass, Andropogon gerardii, and a warm-season C3 forb, Solidago canadensis, at different growing stages. During and after each heat stress (HS) treatment, temperature were monitored for air, canopy, and soil; net CO2 assimilation (Anet), quantum yield of photosystem II (ΦPSII), stomatal conductance (gs), and internal CO2 level (Ci), specific leaf area (SLA), and chlorophyll content of the dominant species were measured. One week after the last HS treatment, all plots were harvested and the biomass of above-ground tissue and flower weight of the two dominant species were determined. HS decreased physiological performance and growth for both species, with S. canadensis being affected more than A. gerardii, indicated by negative HS effect on both physiological and growth responses for S. canadensis. There were significant timing effect of HS on the two species, with greater reductions in the net photosynthetic rate and productivity occurred when HS was applied at later-growing season. The reduction in aboveground productivity in S. canadensis but not A. gerardii could have important implications for plant community structure by increasing the competitive advantage of A. gerardii in this grassland. The present experiment showed that HS, though ephemeral, may promote long-term effects on plant community structure, vegetation dynamics, biodiversity, and ecosystem functioning of terrestrial biomes when more frequent and severe HS occur in the future.
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影响因子：
5.7
作者：
Bussotti, Filippo;Ferrini, Francesco;Fini, Alessio
通讯作者：
Fini, Alessio
DOI：
10.1073/pnas.95.25.14839
发表时间：
1998-12-08
影响因子：
11.1
作者：
Allen, CD;Breshears, DD
通讯作者：
Breshears, DD
影响因子：
4.8
作者：
COLEMAN, JS;BAZZAZ, FA
通讯作者：
BAZZAZ, FA
影响因子：
11.6
作者：
Gunderson, Carla A.;O'Hara, Keiran H.;Edwards, Nelson T.
通讯作者：
Edwards, Nelson T.
影响因子：
1.1
作者：
Henderson, KG;Muller, RA
通讯作者：
Muller, RA