| Chlorophyll fluorescence characteristics of Robinia pseudoacacia and Pinus tabulaeformis under drought stress and rehydration in Beijing area |
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| DOI：10.7606/j.issn.1000-7601.2023.02.04 |
| Key Words: chlorophyll fluorescence characteristics drought stress rehydration Robinia pseudoacacia Pinus tabulaeformis potted experiment |
| Author Name | Affiliation | | ZHAO Na | Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100093, China | | ZHAO Xu | College of Forestry, Shenyang Agricultural University, Shenyang, Liaoning 110866,China | | LI Shaoning | Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100093, China
College of Forestry, Shenyang Agricultural University, Shenyang, Liaoning 110866,China | | XU Xiaotian | Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100093, China | | SUN Zhiyu | College of Forestry, Shenyang Agricultural University, Shenyang, Liaoning 110866,China | | LU Shaowei | Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100093, China
College of Forestry, Shenyang Agricultural University, Shenyang, Liaoning 110866,China |
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| Abstract: |
| Three\|year\|old potted saplings trees of typical deciduous broad leaved tree species Robinia pseudoacacia and evergreen coniferous tree species Pinus tabulaeformis in Beijing were taken as research objects. The chlorophyll fluorescence characteristics of typical tree species in the region in response to drought stress and restoration after drought were analyzed through artificial water control to simulate natural drought in the early growing season and rehydration events after drought. The results showed that: (1) The rapid chlorophyll fluorescence induction kinetics curve (OJIP) of R. pseudoacacia changed obviously under drought stress. Compared with the control treatment, the minimal fluorescence intensity (Fo), the relative variable fluorescence intensity at the J step (VJ) and at the I step (VI) of R. pseudoacacia were significantly increased by 12.95% (P<0.05) under drought stress, and the maximal fluorescence intensity (Fm) of P. tabulaeformis significantly decreased by 24.66%. (2) The photochemical performances and reaction center activities in photosynthetic system II (PSII) and the ratios of capture energy allocation of R. pseudoacacia decreased significantly under drought stress (36.01%~61.73%, P<0.05), whereas those were not found in P. tabulaeformis under drought stress. The effects of water stress on OJIP curve, PSII receptor side and its performance parameters of potted R. pseudoacacia saplings were significantly greater than those of P. tabulaiformis (P<0.01). (3) The quantum yield of dissipatea (φDo) of R. pseudoacacia significantly increased by 20.25% at the beginning of drought, and the transport quantum yield for electron transport (φEo) decreased by 43.88% (P<0.05), while the energy in electron transport chain of P. tabulaeformis was fully utilized at the end of drought while decreasing the trapped energy flux per excited cross section. The reduction of end acceptors at PSI electron acceptor side per excited cross section (REo/CSo) significantly decreased by 29.99% (P<0.05). (4) Chlorophyll fluorescence parameters of the two kinds of potted saplings was restored to the control level in the rehydration stage, and some parameters showed overcompensation effect. In conclusion, the 8.40%±2.03% of soil moisture was the mutation node of chlorophyll fluorescence parameters of R. pseudoacacia saplings, and the photosynthetic capacity of R. pseudoacacia saplings were more affected by soil moisture variation than that of P. tabulaeformis. |
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