首页|Effects of drought stress on the photosynthetic physiological parameters of Populus × euramericana“Neva”
Effects of drought stress on the photosynthetic physiological parameters of Populus × euramericana“Neva”
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Populus × euramericana ''Neva'' is the main poplar species in China, where drought stress is becoming extremely urgent. We carried out this research to study the effects of drought stress on the photosynthesis of Popu-lus × euramericana ''Neva''. Drought stress was induced by 58–62％ (light), 48–52％ (moderate), and 38–42％(severe) relative soil moisture content (RSMC). The effects of drought stress on photosynthetic rate, chlorophyll fluo-rescence parameters, and other related physiological parameters were investigated during treatment. Net pho-tosynthetic rate (PN), and stomatal conductance decreased significantly and intercellular CO2 concentration initially increased and then declined, whereas the stomatal limitation factors showed opposite trends in the light under moderate drought stress. Photosystem II (PSII) maximum photochemical efficiency, actual photochemical efficiency, and photochemical quenching decreased gradually under drought stress, whereas nonphotochemical quenching ini-tially increased and then declined. Superoxide dismutase, peroxidase, and catalase activities initially increased and then decreased as RSMC was reduced, whereas malondi-aldehyde (MDA) content and relative electric conductivity (REC) increased gradually. These results suggest that stomatal factors accounted for the decline in PN under light and moderate drought stress, whereas leaf PN decreased mainly due to non-stomatal factors under severe drought stress. PSII was damaged; thus, photosynthetic electron transfer was restricted, indicating that heat dissipation is important for the light protection mechanism of plants. Antioxidant enzymes increased at the beginning of treat-ment, and the increased MDA and REC led to cell mem-brane damage. These results suggest that poplar seedlings stabilized their photosynthetic apparatus by reducing the light trapping ability under light and moderate drought stress conditions. This helped dissipate heat and enhance antioxidant enzyme activity. Stomatal factors accounted for the decline in PN, whereas damage to PSII and antioxidant enzymes under severe drought stress suggested that the decline in PN was caused by non-stomatal restrictive factors.
Guoting Liang、Jianwen Bu、Shuyong Zhang、Guo Jing、Guangcan Zhang、Xia Liu
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Shandong Provincial Key Laboratory of Soil Erosion and Ecological Restoration, Forestry College of Shandong Agricultural University, Taishan Forest Eco-station of State Forestry Administration, Tai'an 271018, Shandong, People's Republic of China
Department of Food Science and Engineering, Shandong Agriculture and Engineering University, Jinan 250100, Shandong, People's Republic of China
Forestry College of Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China
This study was financially supported by the National Public Welfare Industry Research Project of ChinaThis study was financially supported by the National Public Welfare Industry Research Project of ChinaNational Natural Science Foundation of China
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