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Bulletin of Botanical Research ›› 2022, Vol. 42 ›› Issue (3): 483-491.doi: 10.7525/j.issn.1673-5102.2022.03.018

• Physiology and Ecology • Previous Articles     Next Articles

Effects of Flooding Stress on Photosynthetic Characteristics of Yulania stellata and Its Cultivars

Xiwu DU1,2, Jun QIN2,3, Kang YE2,3, Yonghong HU2,3, Yiwei TAO1, Yongzheng PENG1, Yanxiang SHEN1, Yan LIANG1, Li ZENG1()   

  1. 1.School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 200240
    2.Shanghai Chenshan Botanical Garden,Shanghai 201602
    3.Shanghai Engineering Research Center of Urban Tree Ecology and Applications,Shanghai 200020
  • Received:2020-12-17 Online:2022-05-20 Published:2022-05-20
  • Contact: Li ZENG E-mail:zljs@sjtu.edu.cn
  • About author:DU Xiwu(1994—),male,master,innovation of ornamental plant germplasm resources.
  • Supported by:
    Science and Technology Project of Shanghai Greening and Landscape(G212409);Project of Shanghai Agricultural Commission(1-8);Shanghai Science and Technology Commission Science and Technology Innovation Action Plan(19DZ1203500)


In order to clarify the response rules of photosynthetic and physiological characteristics of Yulania stellata to flooding stress, the double-pot method was used to Y. stellata and its 4 cultivars by flooding. The changes in chlorophyll content, specific leaf area, photosynthetic parameters and chlorophyll fluorescence parameters after different flooded days were measured respectively. The results showed that the changing trends of chlorophyll a, chlorophyll b and total chlorophyll were slightly different under flooding stress, and there were no significant changes in Y. ‘(Mag’s) Piroutte’ and Y.stellata ‘Chrysanthemiflora’, while Y.‘Bety’, Y.stellata and Y.‘Judy’ showed a downward trend respectively. The net photosynthetic rate(Pn) showed a downward trend, and the maximum net photosynthetic rate(Pnmax) and light saturation point(LCP) of the treatment groups were significantly lower than those of the control group respectively. The dark respiration rate(Rd) of Y. stellata ‘Chrysanthemiflora’ and Y. ‘(Mag’s)Piroutte’ of the treatment group was higher than that of the control group. The Rd of Y. ‘Bety’, Y. stellata and Y. ‘Judy’ were significantly reduced after flooding treatment to reduce the consumption of photosynthetic products respectively. The effective photochemical quantum yields(ΦPSⅡ) of Y. ‘(Mag’s)Piroutte’ and Y.‘Judy’ decreased by 8.4% and 24.7% under flooding stress; Y.stellata ‘Chrysanthemiflora’, Y.‘Bety’ and Y.stellata decreased significantly, respectively 76.7%, 85.7% and 64.6%. The maximum photochemical quantum yield(Fv/Fm) of each cultivar of Y.stellata. had a downward trend. The photosynthetic characteristics of Y.stellata andits cultivars were affected by flooding stress, but different cultivars had differences. Except for Y.‘Bety’, the Photosynthesis of the other 4 Y.stellata cultivars performed normally during the 7 d before treatment; Y. ‘(Mag’s)Piroutte’ had strong photosynthetic capacity and waterlogging adaptability. The results provid a theoretical basis for the selection of Y.stellata cultivars suitable for planting in wet and waterlogged areas in southern China.

Key words: Yulania stellata, flooding stress, photosynthesis, light response curve, chlorophyll fluorescence parameters

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