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Open AccessArticle

Seasonal Changes in Photosynthetic Energy Utilization in a Desert Shrub (Artemisia ordosica Krasch.) during Its Different Phenophases

1
Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
2
Key Laboratory for Soil and Water Conservation, State Forestry Administration, Beijing Forestry University, Beijing 100083, China
3
Faculty of Forestry and Environmental Management, 28 Dineen Drive, P.O. Box 4400, University of New Brunswick, Fredericton, NB E3B5A3, Canada
*
Author to whom correspondence should be addressed.
Forests 2018, 9(4), 176; https://doi.org/10.3390/f9040176
Received: 26 February 2018 / Revised: 25 March 2018 / Accepted: 26 March 2018 / Published: 30 March 2018
(This article belongs to the Special Issue Afforestation and Reforestation: Drivers, Dynamics, and Impacts)
Our understanding of the mechanisms of plant response to environment fluctuations during plants’ phenological phases (phenophases) remains incomplete. Continuous chlorophyll fluorescence (ChlF) measurements were acquired from the field to quantify the responses in a desert shrub species (i.e., Artemesia ordosica Krasch. (A. ordosica)) to environmental factors by assessing variation in several ChlF-linked parameters and to understand plant acclimation to environmental stresses. Maximal quantum yield of PSII photochemistry (Fv/Fm) was shown to be reduced by environmental stressors and to be positively correlated to air temperature (Ta) during the early and late plant-growing stages, indicating a low temperature-induced inhibition during the leaf expansion and coloration phases. Effective quantum yield of PSII photochemistry (ΦPSII) was negatively correlated to incident photosynthetically active radiation (PAR) irrespective of phenophase, suggesting excessive radiation-induced inhibition at all phenophases. The main mechanism for acclimating to environmental stress was the regulatory thermal dissipation (ΦNPQ) and the long-term regulation of relative changes in Chl a to Chl b. The relative changes in photosynthetic energy utilization and dissipation in energy partitioning meant A. ordosica could acclimatize dynamically to environmental changes. This mechanism may enable plants in arid and semi-arid environments to acclimatize to increasingly extreme environmental conditions under future projected climate change. View Full-Text
Keywords: Artemisia ordosica; chlorophyll fluorescence; energy partitioning; phenophase; photoprotection Artemisia ordosica; chlorophyll fluorescence; energy partitioning; phenophase; photoprotection
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MDPI and ACS Style

Ren, C.; Wu, Y.; Zha, T.; Jia, X.; Tian, Y.; Bai, Y.; Bourque, C.P.-A.; Ma, J.; Feng, W. Seasonal Changes in Photosynthetic Energy Utilization in a Desert Shrub (Artemisia ordosica Krasch.) during Its Different Phenophases. Forests 2018, 9, 176.

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