Experimental warming and drought treatments reduce physiological activities and increase mortality of Pinus koraiensis seedlings
- Authors
- Chang, Hanna; An, Jiae; Roh, Yujin; Son, Yowhan
- Issue Date
- 7월-2020
- Publisher
- SPRINGER
- Keywords
- Chlorophyll fluorescence; Drought; Gas exchange; Korean pine; Mortality; Warming
- Citation
- PLANT ECOLOGY, v.221, no.7, pp.515 - 527
- Indexed
- SCIE
SCOPUS
- Journal Title
- PLANT ECOLOGY
- Volume
- 221
- Number
- 7
- Start Page
- 515
- End Page
- 527
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54889
- DOI
- 10.1007/s11258-020-01030-3
- ISSN
- 1385-0237
- Abstract
- This study was conducted to investigate physiological responses and mortality of P. koraiensis seedlings under warming and drought treatments. In May 2016, 90 P. koraiensis seedlings (aged 2 years) were planted in each plot (n = 20), and exposed to a combination of + 3 degrees C warming and - 30% drought, with 5 replicates. Net photosynthetic rate (A), stomatal conductance (g(s)), transpiration (E), and maximal photochemical efficiency of photosystem II (F-v/F-m) were measured from April 2017 to December 2018. Seedling mortality was measured eight times during the study period at irregular intervals. A, g(s), and E decreased by - 21.99%, - 34.58%, and - 33.6% under the warming treatment, and by - 5.82%, - 11.03%, and - 8.56% under the drought treatment, respectively, in response to decreasing soil water content and increasing soil and leaf temperature. There was no significant difference in the overall F-v/F-m by the warming and drought treatments. The long-term reduction in photosynthesis by the warming treatment might cause carbon starvation, resulting in a 7.43-fold increase in seedling mortality. Moreover, under the drought treatment, seedling mortality was unaffected since its effects on A were occasional and small as compared to the warming treatment. Due to the unusually high temperature in summer of 2018, leaf temperature was 38.28 degrees C and seedlings were exposed to temperature above 45 degrees C for 10.7 h under the warming treatment. F-v/F-m in August 2018 decreased sharply by - 11.79% and seedling mortality increased by 15.31-fold during summer, under the warming treatment. Thus, leaf damage by severe heat stress may have triggered a rapid increase in seedling mortality.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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