Rory C. O'Connor, Victoria G. Fox , Erik P. Hamerlynck
{"title":"Elymus elymoides 和 Pseudoroegneria spicata 幼苗在急性水胁迫下的光合恢复能力","authors":"Rory C. O'Connor, Victoria G. Fox , Erik P. Hamerlynck","doi":"10.1016/j.rama.2024.03.012","DOIUrl":null,"url":null,"abstract":"<div><p>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 (A<sub>sat</sub>), apparent CO<sub>2</sub> assimilation quantum yield (ΦCO<sub>2</sub>), and light-adapted PSII yield (Φ<sub>PSII</sub>) of seedlings from two native perennial bunchgrasses <em>(Elymus elymoides, Pseudoroegneria spicata)</em> 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 A<sub>sat</sub> and ΦCO<sub>2</sub> by day 3 of the dry-down but had divergent recoveries from the acute water stress. <em>E. elymoides</em> took a single day to recover A<sub>sat</sub> and ΦCO<sub>2</sub> to prestress levels, while it took <em>P. spicata</em> 6 d to have 50% recovery from acute water stress. Especially notable is that after reduction in Φ<sub>PSII</sub> on d 7 of the dry-down, <em>E. elymoides</em> recovered within 1 d at a lower Φ<sub>PSII</sub> compared with pretreatment, while <em>P. spicata</em> had an additional 1-d lag in Φ<sub>PSII</sub> recovery. These results suggest that <em>E. elymoides</em> (Turkey Lake germplasm) seedlings are more physiologically resilient to acute water stress than <em>P. spicata</em> (Anatone germplasm), which has implications for restoration planning and native plant breeding.</p></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":null,"pages":null},"PeriodicalIF":2.4000,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1550742424000514/pdfft?md5=33ab1e7bf8a235f27308874bc7efa8dd&pid=1-s2.0-S1550742424000514-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Photosynthetic Resilience of Elymus elymoides and Pseudoroegneria spicata Seedlings Following Acute Water Stress\",\"authors\":\"Rory C. O'Connor, Victoria G. Fox , Erik P. Hamerlynck\",\"doi\":\"10.1016/j.rama.2024.03.012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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 (A<sub>sat</sub>), apparent CO<sub>2</sub> assimilation quantum yield (ΦCO<sub>2</sub>), and light-adapted PSII yield (Φ<sub>PSII</sub>) of seedlings from two native perennial bunchgrasses <em>(Elymus elymoides, Pseudoroegneria spicata)</em> 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 A<sub>sat</sub> and ΦCO<sub>2</sub> by day 3 of the dry-down but had divergent recoveries from the acute water stress. <em>E. elymoides</em> took a single day to recover A<sub>sat</sub> and ΦCO<sub>2</sub> to prestress levels, while it took <em>P. spicata</em> 6 d to have 50% recovery from acute water stress. Especially notable is that after reduction in Φ<sub>PSII</sub> on d 7 of the dry-down, <em>E. elymoides</em> recovered within 1 d at a lower Φ<sub>PSII</sub> compared with pretreatment, while <em>P. spicata</em> had an additional 1-d lag in Φ<sub>PSII</sub> recovery. These results suggest that <em>E. elymoides</em> (Turkey Lake germplasm) seedlings are more physiologically resilient to acute water stress than <em>P. spicata</em> (Anatone germplasm), which has implications for restoration planning and native plant breeding.</p></div>\",\"PeriodicalId\":49634,\"journal\":{\"name\":\"Rangeland Ecology & Management\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.4000,\"publicationDate\":\"2024-04-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S1550742424000514/pdfft?md5=33ab1e7bf8a235f27308874bc7efa8dd&pid=1-s2.0-S1550742424000514-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Rangeland Ecology & Management\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1550742424000514\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Rangeland Ecology & Management","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1550742424000514","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ECOLOGY","Score":null,"Total":0}
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.
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.