ACTA HORTICULTURAE SINICA ›› 2016, Vol. 43 ›› Issue (6): 1044-1056.doi: 10.16420/j.issn.0513-353x.2015-0728

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Effects of High Temperatures on Leaf Structures and Physiological Metabolism of North Highbush Blueberry

HUANG Lei1,SUN Yao-qing2,HAO Li-hua3,DANG Cheng-hua3,ZHU Yu4,WANG He-xin4,CHENG Dong-juan3,ZHANG Yun-xin3,and ZHENG Yun-pu3,5,*   

  1. (1School of Environment and Resources,Dalian Nationality University,Dalian,Liaoning 116600,China;2School of Forestry,Xinyang Agriculture and Forestry University,Xinyang,Henan 464000,China;3School of Water Conservancy and Hydropower,Hebei University of Engineering,Handan,Hebei 056038,China;4Institute of Modern Agricultural Research,Dalian University,Dalian,Liaoning 116622,China;5Research Center of Water Ecological Civilization and Social Management,Handan,Hebei 056038,China)
  • Online:2016-06-25 Published:2016-06-25


The effects of high temperatures on leaf traits,chloroplast ultra-structures,gas exchange,chlorophyll fluorescence parameters,antioxidant enzyme activity,pigment contents,and electrolyte leakage of three north highbush blueberry cultivars(‘Bluecrop’,‘DukeandBrigitta’)were examined with four growth chambers by controlling growth temperatures at 253035 and 40 . The results showed that temperature barely changed the activity of superoxide dismutaseSODof the three cultivarsbut significantly affected the activity of peroxidasePODand catalaseCAT. Meanwhilethe chloroplast ultrastructure was seriously damaged at the growing temperature of 40 except forBrigitta. Moreoverboth the chlorophyll and carotenoid pigments of the three north highbush blueberry cultivars were decreased with the increase of temperature. The net photosynthetic ratesPn),transpiration ratesTr),and water use efficiencyWUEalso featured a similar trend. Moreoverthe measurements on the electrolyte leakage and Fv/Fm indirectly supported the above conclusions and suggested that 30 and 35 had little effects on the leaf structure and function of the three blueberry cultivarsbut 40 resulted in severe damages on the cellular membrane structure. These results suggested that three north highbush blueberry cultivars had different ability in resisting heat stress withBrigitta>Bluecrop>Duke.

Key words: Vaccinium corymbosum, heat stress, gas exchange, pigments content, chlorophyll fluorescence, antioxidant enzyme activity

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