Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (10): 2966-2971.DOI: 10.3969/j.issn.1000-2561.2021.10.029

• Plant Protection & Bio-safety • Previous Articles     Next Articles

Paracoccus marginatus Infestation Influences the Content of Secondary Metabolites in Different Cassava Cultivars

WU Yan1,2, CHEN Qing2,*(), LIANG Xiao2, WU Chunling2, LIU Ying2, DOU Hongshuang2, FAN Dongzhe2, GENG Mengting1, CHEN Yinhua1   

  1. 1. School of Life and Pharmaceutical Sciences, Hainan University, Haikou, Hainan 570228, China
    2. Environment and Plant Protection Institute, China Academy of Tropical Agricultural Sciences / Key Laboratory of Pests Comprehensive Governance for Tropical Crops, Ministry of Agriculture and rural affairs / Hainan Engineering Research Center for Biological Control of Tropical Crops Diseases and Insect Pests / Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou, Hainan 571101, China
  • Received:2020-12-15 Revised:2021-02-08 Online:2021-10-25 Published:2021-11-25
  • Contact: CHEN Qing


Secondary metabolites play an important role in plant defense against phytophagous pests, however, to the best of our knowledge, there is lack of studies about the relationship between secondary metabolites and insect resistance of cassava. In this study, the contents of total phenol, malondialdehyde (MDA) and tannin in leaves of different cassava cultivars before and after being damaged by Paracoccus marginatus were analyzed. The results showed that there was no significant difference in the contents of total phenols and MDA in the leaves of the susceptible cassava cultivars such as ‘BRA900’ ‘bread’ cassava, ‘SC205’ and ‘Swiss T7’ after 1 d, 4 d and 8 d infestation, while the tannin content was significantly decreased over time. However, the content of total phenol and tannin in the leaves of the resistant cassava cultivars like ‘Myanmar’ and ‘C1115’ increased significantly, while the content of MDA decreased significantly. In addition, the content of total phenols in the insect-resistant cassava cultivars was significantly lower than those in susceptible ones before damaged by P. marginatus, while it was significantly higher than that of the susceptible cultivars as being damaged over time. There was no significant difference in MDA content between the insect-resistant and insect-susceptible cassava cultivars before damaged, while it was significantly lower than those in the susceptible ones after damaged for 1 d, 4 d and 8 d. Furthermore, the tannin content of the insect-resistant cassava cultivars was significantly higher than those of the susceptible ones before and after damaged by P. marginatus. The correlation analysis showed that the cassava resistance to P. marginatus was positively correlated with total phenol and tannin content, and negatively correlated with MDA content. This study preliminarily elucidated the mechanism of cassava resistance to P. marginatus based on secondary metabolites such as total phenols, MDA and tannin.

Key words: Paracoccus marginatus, cassava cultivars, total phenol, malondialdehyde, tannin

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