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

作     者：Lin Zhengchun Ni Shanshan Wu Qiuzhen Lai Zhongxiong 

作者机构：College of HorticultureFujian Agriculture and Forestry UniversityFuzhou 350002China Institute of Horticultural BiotechnologyFujian Agriculture and Forestry UniversityFuzhou 350002China 

出 版 物：《Plant Diseases and Pests》 (植物病虫害研究（英文版）)

年 卷 期：2020年第11卷第5期

页      面：1-7,13页

学科分类：09[农学] 0904[农学-植物保护] 090401[农学-植物病理学] 090402[农学-农业昆虫与害虫防治] 

基　　金：Young and Middle-aged Teacher Educational Research Project of Fujian Province(KLA19009A)&Major Agricultural Science and Technology Project of Fujian Province(2015NZ0002-1)&Science and Technology Innovation Fund of Fujian Agriculture and Forestry University(KF2015108) 

主　　题：Oncidium hybridum Soft rot Infection Defense enzymes Chlorophyll fluorescence properties 

摘      要：[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 ***.