Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species

BAI Jingjing; WU Junwen; LI Jiyue; HE Qian; QIU Quan; PAN Xin

doi:10.7671/j.issn.1001-411X.2015.01.016

Journal of South China Agricultural University > 2015 > 36(1): 85-90. > DOI: 10.7671/j.issn.1001-411X.2015.01.016

BAI Jingjing, WU Junwen, LI Jiyue, HE Qian, QIU Quan, PAN Xin. Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species[J]. Journal of South China Agricultural University, 2015, 36(1): 85-90. DOI: 10.7671/j.issn.1001-411X.2015.01.016

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Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species

College of Forestry, South China Agricultural University, Guangzhou 510642, Guangdong, China

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Received Date: September 13, 2013
Available Online: May 17, 2023

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Abstract

Abstract

Objective
A comparison of drought resistance was made between two fast-growing species in South China, Eucalyptus urophylla×E. grandis (EE for abbr.) and bamboo willow (BW for abbr.).
Method
Effective quantum yield of PSⅡ photochemistry(Yield), apparent electron transport rate(ETR), the photochemical quenching (qP), the non-photochemical quenching (qN), minimal fluorescence(F₀), maximal fluorescence(F_m), potential photochemical efficiency of PSⅡ(F_v/F_m) in EE and BW were tested by OS5P pulse modulated chlorophyll fluorometer under drought stress.
Result and conclusion
Yield, ETR, qP, F_m and F_v/F_m all declined during the drought. At day 24 after treatment, ETR declined by 48.02% and 25.12% EE and BW, respectively. qN and F₀ in the 2 species increased. qN in BW rose by 217.59%, which was significantly higher than that in EE (146.40%, P < 0.05). The relative increment in F₀ in BW (49.11%) was smaller than that in EE (92.03%) at the end of the drought treatment. Correlation analyses were made concerning chlorophyll fluorescence characteristics and soil water content. In both species, ETR showed a significant positive correlation with soil water content (P < 0.01). F₀ in EE showed a significant negative correlation with soil water content (P < 0.01). F_m and F_v/F_m of BB and soil water content showed a significant positive correlation (P < 0.01). These results indicate that correlations existe among chlorophyll fluorescence characteristics in two species under drought. BW has greater drought resistance than EE as revealed by chlorophyll fluorescence characteristics.
- bamboo willow,
- Eucalyptus urophylla×E.grandis,
- drought stress,
- chlorophyll fluorescence

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References (37)

References

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Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species

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