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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (4): 861-867.doi: 10.16420/j.issn.0513-353x.2021-0391

• Research Notes • Previous Articles     Next Articles

Effects of Citrus Yellow Vein Clearing Virus on Photosynthetic Characteristics and Chloroplast Ultrastructure of Lemon

WANG Ying1, QIN Yangyang1, ZENG Ting1, LIAO Ping1, ZHANG Wei2, ZHOU Yan1,*(), ZHOU Changyong1,*()   

  1. 1. National Citrus Engineering Research Center,Citrus Research Institute,Southwest University,Chongqing 400712,China
    2. Plant Protection Station,Department of Agriculture and Rural Affairs of Sichuan Province,Chengdu 610041,China
  • Received:2021-06-15 Revised:2021-09-07 Online:2022-04-25 Published:2022-04-24
  • Contact: ZHOU Yan,ZHOU Changyong E-mail:zhouyan@cric.cn;zhoucy@cric.cn

Abstract:

Three-year-old Eureka lemon seedlings citrus yellow vein clearing virus(CYVCV)infection were used as test materials. After the seedlings showed typical symptoms such as yellowing and vein clearing,the following parameters as chlorophyll content,chlorophyll fluorescence,photosynthetic parameters and enzyme activities of lemon leaves etc.,were measured or monitored,respectively. The results showed that chlorophyll content,net photosynthetic rate(Pn),stomatal conductance(Gs),potential photochemical efficiency(Fv/Fo)and maximum photochemical efficiency(Fv/Fm)in CYVCV infected lemon had been significantly reduced,whereas the initial fluorescence(Fo),catalase activity(CAT)and malondialdehyde(MDA)content had been significantly increased. There was no significant changes in the activities of peroxidase(POD)and superoxide(SOD)dismutase. After infection it was found that,the chloroplasts swelled and deformed due to the increase of starch grains,the stroma and grana lamellas were loose by using transmission electron microscope(TEM),and a large number of osmophilic granules were observed. The results indicated that CYVCV infection destroyed the chloroplast structure and reduced the photosynthesis in lemon leaf.

Key words: Citrus, Citrus yellow vein clearing virus, lemon, photosynthesis, chloroplast ultrastructure

CLC Number: