Photosynthetic gas-exchange and PSII photochemical acclimation to drought in a native and non-native xerophytic species (Artemisia ordosica and Salix psammophila)
Photosynthetic gas-exchange and PSII photochemical acclimation to drought in a native and non-native xerophytic species (Artemisia ordosica and Salix psammophila)
复制标题
本地和非本地旱生植物（油蒿和沙柳）的光合气体交换和 PSII 光化学适应干旱
DOI：
10.1016/j.ecolind.2018.06.040
复制
发表时间：
2018-11
影响因子：
6.9
通讯作者：
Ma JY
中科院分区：
文献类型：
--
作者：
Wu YJ;Zha TS;Ren C;Tian Y;Liu P;Bai YJ;Ma JY
植物光合适应干旱的机制尚不完全。我们通过植物光系统荧光响应来研究光合性能，以长期的，异常的夏季干旱（即，持续61 d，土壤含水量<0.1 m3·m−3）和干旱后的恢复。研究的关键指标是通过同时、连续原位测量气体交换和叶绿素荧光来估算植物的气孔导度（gs）、蒸腾速率（Tr）、水分利用效率（WUE）、最大和实际光化学效率（Fv/FmandPSII）、非光化学猝灭（NPQ）和叶片光合作用（PN）。叶绿素荧光相关指标“Fv/Fm”的两个物种下调响应土壤水分含量（SWC）的赤字，与差异SWC阈值为0.07和0.08 m3 m − 3为A。鄂尔多斯和S. psammophila。结果表明，两种植物均通过降低光合速率和水分利用效率的气孔调节机制和耗散过量光能的PSII NPQ机制来适应夏季干旱，表明两种植物在适应干旱时均采取了一种节水策略。与非本地物种相比，本地物种一般有更大的光合性能在水分亏缺条件下表现出更高的蒸腾作用，净CO2同化，和更大的PSII光化学效率。较低的WUE和更大的抗旱性和弹性，结合PSII光化学效率的微小变化是一致的一个明确的节水响应由A. ordosica。结果支持了这样的假设：由于更强的抵抗力和从长期干旱中更快的整体恢复，本土沙漠灌木物种可能会优于非本土灌木物种。因此，随着未来气候变化，干旱程度和持续时间的增加，建议在荒漠化防治和生态恢复中使用本地灌木物种，以实现可持续的生态系统管理。
The mechanisms of plant photosynthetic acclimation to drought remains incomplete. We examined the photosynthetic performance through plant photosystem-fluorescence response to a long-lasting, anomalous summer drought (i.e., lasting for 61 days, with soil water content <0.1 m3·m−3) and subsequent post-drought recovery of a native and a non-native desert shrub species (Artemisia ordosicaandSalix psammophila, respectively) growing in northwest China. Key indicators to the examination are derived estimates of plant stomatal conductance (gs), transpiration (Tr), water use efficiency (WUE), maximum and actual photochemical efficiency (Fv/Fmand ФPSII), non-photochemical quenching (NPQ), and leaf photosynthesis (PN) from simultaneous, continuousin situmeasurements of gas exchange and chlorophyll fluorescence. Chlorophyll fluorescence-associated indicator “Fv/Fm” for both species was down regulated in response to deficits in soil water content (SWC), with differential SWC thresholds of 0.07 and 0.08 m3m−3forA. ordosicaandS. psammophila, respectively. The results revealed that both species acclimate to summer drought by a stomatal-regulation mechanism of reducinggsand WUE and by a PSII NPQ mechanism of dissipating the excessive light energy, indicative of a water-conservation strategy in the acclimation to drought. In comparison with the non-native species, the native species generally had greater photosynthetic performance under water-deficit conditions demonstrating higher transpiration, net CO2assimilation, and greater PSII photochemical efficiency. Lower WUE and greater drought resistance and resilience, combined with minor changes in PSII photochemical efficiency are consistent with a well-defined water-conservation response byA.ordosica. The results support the hypothesis that native desert-shrub species can potentially outperform non-native shrub species, due to stronger resistance and faster overall recovery from long-lasting drought. Therefore, with increased drought severity and duration anticipated with future climate change, the native shrub species is suggested to be used in desertification control and ecological restoration for sustainable ecosystem management.
登录
查看更多内容
沙漠灌木油蒿树液流对生物物理因素响应的土壤湿度控制
影响因子：
4.9
作者：
Zha Tianshan;Qian Duo;Jia Xin;Bai Yujie;Tian Yun;Bourque Charles P-A;Ma Jingyong;Feng Wei;Wu Bin;Peltola Heli
通讯作者：
Peltola Heli
影响因子：
4.3
作者：
T. Quaas;Silvia Berteotti;M. Ballottari;Kerstin Flieger;R. Bassi;C. Wilhelm;R. Goss
通讯作者：
T. Quaas;Silvia Berteotti;M. Ballottari;Kerstin Flieger;R. Bassi;C. Wilhelm;R. Goss
沙漠灌木（Artemisia ordosica Krasch.）不同物候期光合能量利用的季节变化
影响因子：
2.9
作者：
Ren Cai;Wu Yajuan;Zha Tianshan;Jia Xin;Tian Yun;Bai Yujie;Bourque Charles P-A;Ma Jingyong;Feng Wei
通讯作者：
Feng Wei
影响因子：
3.7
作者：
Park SR;Kim S;Kim YK;Kang CK;Lee KS
通讯作者：
Lee KS
DOI：
--
发表时间：
1998
期刊：
--
影响因子：
--
作者：
Ben Wang;T. Zha;Xin Jia;Bin Wu;Yuqing Zhang;Shu-gao Qin
通讯作者：
Ben Wang;T. Zha;Xin Jia;Bin Wu;Yuqing Zhang;Shu-gao Qin