Hongmei Zhang¹ , Haijun Jin¹ , Lijun Bu² , Xiaotao Ding¹ , Lizhong He¹ , Jiawei Cui¹ , Jijun Hu³ , Jizhu Yu¹

1 Horticultural Research Institute, Shanghai Academy of Agricultural Sciences; Shanghai Key Lab of Protected Horticultural Technology, Shanghai, 201106, China
2 Shanghai Sunqiao Yijia Agricultural Technology Co. Ltd, Shanghai, 201210, China
3 Shanghai Funong Seed Industry Co. Ltd, Shanghai, 201209, China
Author    Correspondence author
International Journal of Horticulture, 2022, Vol. 12, No. 3   doi: 10.5376/ijh.2022.12.0003
Received: 12 Sep., 2022    Accepted: 19 Sep., 2022    Published: 30 Sep., 2022

This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Zhang H.M., Jin H.J., Bu L.J., Ding X.T., He L.Z., Cui J.W., Hu J.J., and Yu J.Z., 2022, Physiological response of different cucumber hybrid combinations to inoculation of powdery mildew, International Journal of Horticulture, 12(3): 1-7 (doi: 10.5376/ijh.2022.12.0003)

In order to study the physiological changes of different cucumber combinations in South China to powdery mildew, on the 0, 1, 3, 6 and 9 days after inoculation of powdery mildew, the changes of disease index, chlorophyll content, defense enzyme activity and osmoregulation substance content of 5 South China hybrid combinations were studied, and relationship between the changes of physiological indexes and the resistance of cucumber powdery mildew was analyzed. The results showed that, according to the disease index, the resistance of 5 cucumber combinations was graded, 18C-3 was disease resistance, 18C-2 and 18C-4 were medium resistance, 18C-1 and 18C-5 were susceptible; after inoculation of 5 cucumber combinations with powdery mildew, the content of chlorophyll decreased, and the content of chlorophyll in 18C-3 was higher than that in other combinations; The activity of superoxide dismutase (SOD), peroxidation(POD) and phenylalanine ammonia lyase (PAL) of most combinations decreased first, and then increased. the activity of polyphenol oxidase (PPO) was up – down – up again. The activity of defense enzyme of resistant combination 18C-3 was significantly higher than that of other combinations, and maintained high proline (PRO) content and low malondialdehyde (MDA) content all the time, indicating that the resistant combination had stronger defense ability and resistance to membrane lipid peroxidation than the susceptible combinations. By analyzing the changes of physiological indexes and the relationship with resistance to powdery mildew of cucumber, the resistant combination of South China type was selected, which provided more theoretical basis for resistance identification and genetic breeding of cucumber powdery mildew.

Cucumber; Hybrid combination; Powdery mildew; Physiological response