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Physiological Response of oncidium hybridum‘Gower Ramsey’Infected by Erwinia carotovora

Plant Diseases and Pests 2020年第5期11卷 1-7,13页

作者： Lin Zhengchun Ni Shanshan Wu Qiuzhen Lai Zhongxiong College of Horticulture Fujian Agriculture and Forestry UniversityFuzhou 350002China Institute of Horticultural Biotechnology Fujian Agriculture and Forestry UniversityFuzhou 350002China

[Objective]The paper was to study the physiological mechanism of oncidium hybridum‘Gower Ramsey’infected by Erwinia carotovora ***.[Method]***‘Gower Ramsey’was inoculated with *** by needle-punching *** leaves inoculated with sterile water were used as control,and samples were collected at 12,24,36 and 48 h post inoculations to determine the physiological indexes,respectively.[Result]The contents of MDA,flavonoid,lignin,soluble protein and the activities of POD,SOD,CAT,PPO and PAL in *** leaves first increased then *** 12 h post inoculation,the activities of SOD and CAT increased significantly by 40.49%and 37.77%(P0.05,the same below),and increased significantly by 23.66%at 36 h;the content of soluble sugar content had no significant difference compared with the ***,the chlorophyll a and carotenoid contents tended to decrease dramatically,while chlorophyll b increased significantly by 95.33%at 24 h,then *** initial fluorescence parameter of Fm/Fv and Y(II)decreased significantly by 47.14%and 54.61%,respectively,while the Y(NO)increased significantly by 33.61%,compared with the control.[Conclusion]The contents of Pro,MDA,lignin,soluble protein and the activities of POD,SOD,CAT,PPO and PAL in *** leaves are closely related to the infection of ***,which provide new clues for revealing the infection mechanism of *** in ***.

关键词： oncidium hybridum Soft rot Infection Defense enzymes Chlorophyll fluorescence properties

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