[1]ZHANG Yuyu,WANG Jinxin,MA Xu,et al.Effects of Drought and Rewatering on Chlorophyll Fluorescence Parameters of Platycladus orientalis[J].Research of Soil and Water Conservation,2021,28(02):242-247+255.
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Effects of Drought and Rewatering on Chlorophyll Fluorescence Parameters of Platycladus orientalis
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 02
Page number:
242-247+255
Column:
Public date:
2021-02-06
- Title:
- Effects of Drought and Rewatering on Chlorophyll Fluorescence Parameters of Platycladus orientalis
- CLC:
- Q945.78
- DOI:
- -
- Abstract:
- To study the effects of different degrees of soil drought stress and rehydration on chlorophyll fluorescence parameters of Platycladus orientalis seedlings,one-year-old Platycladus orientalis seedlings were used as experimental materials, and four water gradients [relative soil water content(RSWC): 40%, 52.16%, 70%, 87.84%] were set, 100% RSWC(with adequate water supply)was kept as control. Drought stress was imposed for 60 days and then the plants were rewatered up to 100% RSWC. The chlorophyll fluorescence parameters were measured before rewatering and after 2, 24, 48 and 72 hours of rewatering. The maximum photochemical quantum yield(Fv/Fm), relative photosynthetic electron transfer rate(ETR)and actual photochemical quantum yield(Yield)of Platycladus orientalis PSⅡ showed the downward trend with the increasing water stress, while the non-photochemical quenching coefficient(NPQ)showed an upward trend. In case of 40% RSWC, Fv/Fm, ETR and Yield decreased by 1.1%, 4.5% and 4.9%, respectively, whereas NPQ increased by 22.6% compared with the control. After rewatering, chlorophyll fluorescence parameters of Platycladus orientalis were restored in all the treatments to varying extent, Fv/Fm reached the maximum in the treatments(except 70% RSWC)after 24 hours of rewatering, and in 40% RSWC, Fv/Fm increased 3.1% compared with that of the control. In contrast, Yield and ETR reached the maximum in all the treatments after 48 hours of rewatering, and in 40% RSWC, Yield and ETR increased by 1.0% and 1.2%, respectively, compared to the control. Drought stress, especially severe stress(40% RSWC)had a certain damaging effect to PSⅡ of Platycladus orientalis and a certain degree of influence on photosynthesis, but after rewatering, the indicators could be restored correspondingly.
- References:
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Last Update:
2021-02-10