Elymus elymoides 和 Pseudoroegneria spicata 幼苗在急性水胁迫下的光合恢复能力

IF 2.4 3区 环境科学与生态学 Q2 ECOLOGY Rangeland Ecology & Management Pub Date : 2024-04-13 DOI:10.1016/j.rama.2024.03.012
Rory C. O'Connor, Victoria G. Fox , Erik P. Hamerlynck
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引用次数: 0

摘要

人口统计研究表明,北美寒冷荒漠牧场中新出现的束草幼苗的死亡率限制了恢复的成功率,但幼苗对生态生理压力的恢复能力的变化如何导致这一情况的发生尚不清楚。我们测量了两种本地多年生束草(Elymus elymoides 和 Pseudoroegneria spicata)幼苗在急性水胁迫(6% 土壤湿度)期间和恢复过程中的光饱和光合速率(Asat)、表观 CO2 同化量子产率(ΦCO2)和光适应 PSII 产率(ΦPSII)。两个物种的所有幼苗都经受住了 14 天的干枯和恢复期,在干枯期的第 3 天,Asat 和 ΦCO2 都减少了 95%,但从急性水分胁迫中恢复的情况各不相同。E.elymoides只用了一天时间就将Asat和ΦCO2恢复到预应力水平,而P.spicata则用了6天时间才从急性水分胁迫中恢复50%。尤其值得注意的是,在干燥的第 7 天,ΦPSII 下降后,E. elymoides 在 1 天内就恢复到了与干燥前相比较低的ΦPSII 水平,而 P. spicata 的ΦPSII 恢复则要再滞后 1 天。这些结果表明,E. elymoides(土耳其湖种质)幼苗比 P. spicata(Anatone 种质)对急性水胁迫的生理恢复能力更强,这对恢复规划和本地植物育种具有重要意义。
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Photosynthetic Resilience of Elymus elymoides and Pseudoroegneria spicata Seedlings Following Acute Water Stress

Demographic studies suggest that mortality of emerging bunchgrass seedlings limits restoration success across North American cold desert rangelands, but how variation in seedling resilience to ecophysiological stress contributes to this is unclear. We measured light-saturated photosynthetic rate (Asat), apparent CO2 assimilation quantum yield (ΦCO2), and light-adapted PSII yield (ΦPSII) of seedlings from two native perennial bunchgrasses (Elymus elymoides, Pseudoroegneria spicata) during and in recovery from acute water stress (6% soil moisture). All seedlings of both species survived the 14-d dry-down and recovery, and both had ∼95% reduction in Asat and ΦCO2 by day 3 of the dry-down but had divergent recoveries from the acute water stress. E. elymoides took a single day to recover Asat and ΦCO2 to prestress levels, while it took P. spicata 6 d to have 50% recovery from acute water stress. Especially notable is that after reduction in ΦPSII on d 7 of the dry-down, E. elymoides recovered within 1 d at a lower ΦPSII compared with pretreatment, while P. spicata had an additional 1-d lag in ΦPSII recovery. These results suggest that E. elymoides (Turkey Lake germplasm) seedlings are more physiologically resilient to acute water stress than P. spicata (Anatone germplasm), which has implications for restoration planning and native plant breeding.

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来源期刊
Rangeland Ecology & Management
Rangeland Ecology & Management 农林科学-环境科学
CiteScore
4.60
自引率
13.00%
发文量
87
审稿时长
12-24 weeks
期刊介绍: Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes. Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.
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