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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (9): 203-213.DOI: 10.11686/cyxb2020345

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Diurnal change in chlorophyll fluorescence parameters in three desert plants

Lu-yao WU1(), Jian-guo ZHANG1(), Wen-qian CHANG1, Shao-lei ZHANG1, Qing CHANG2   

  1. 1.College of Natural Resources and Environment,Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China,Ministry of Agriculture and Rural Affairs,Northwest A&F University,Yangling 712100,China
    2.Xinjiang Institute of Ecology and Geography,Chinese Academy of Science,Urumqi 830011,China
  • Received:2020-07-20 Revised:2020-09-21 Online:2021-08-30 Published:2021-08-30
  • Contact: Jian-guo ZHANG

Abstract:

This research evaluated the relationship between chlorophyll fluorescence parameters and environmental factors in three common species of shelterbelt plants (Calligonum caput-medusaeTamarix ramosissima, and Haloxylon ammodendron) found in the hinterland of Taklimakan Desert in order to elucidate the adaptation strategies of the three species in an extreme environment, and to provide theoretical data to assist with the management and protection of the highway shelterbelt. Diurnal changes in chlorophyll fluorescence were measured using a Photosynq MultiseQ multi-function plant-measuring instrument. There were four main conclusions. 1) All three soils were alkaline, and electrical conductivity (EC) values of the 0-30 cm soil layer were significantly higher than in soil below 30 cm depth. The water content in the upper 1 m of the soil profile ranked: H. ammodendron>T. ramosissima>C. caput-medusae. 2) The diurnal variation in photosynthetically active radiation (PAR), atmospheric temperature, leaf temperature, and linear electron flux (LEF) increased through the morning to peak values at approximately 14:00 h and then declined, while values for atmospheric humidity and actual photochemical efficiency Y(II) showed a ‘V’ shape. 3) For all the three plant species, PAR data had significant positive correlations with LEF, non-photochemical quenching coefficient (NPQ), adjusting energy dissipation quantum yield [Y(NPQ)], and non-adjusting energy dissipation quantum yield [Y(NO)], however, they showed a significant negative correlation with actual photochemical efficiency [Y (II)]. In addition, Y(II) had an extremely significant negative correlation with Y(NPQ) and Y(NO). 4) Among the chlorophyll fluorescence parameters of the three plant species, LEF, NPQ, and Y(II) of both H. ammodendron and C. caput-medusae were higher than those of T. ramosissima, while Y(NO) of T. ramosissima was significantly higher than that of C. caput-medusae and H. ammodendron. Therefore, high temperature and high light intensity exerted different effects on the three species, and the stress resistance of the three species indicated by principal component analysis ranked H. ammodendron>C. caput-medusae>T. ramosissima.

Key words: Calligon caput-medusae, Haloxylon ammodendron, Tamarix ramosissima, chlorophyll fluorescence parameters, Taklimakan Desert hinterland, high temperature, high light stress