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

doi:10.3969/j.issn.1000-2561.2021.10.029

Abstract

Abstract:

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

CLC Number:

S435.33

WU Yan, CHEN Qing, LIANG Xiao, WU Chunling, LIU Ying, DOU Hongshuang, FAN Dongzhe, GENG Mengting, CHEN Yinhua. Paracoccus marginatus Infestation Influences the Content of Secondary Metabolites in Different Cassava Cultivars[J]. Chinese Journal of Tropical Crops, 2021, 42(10): 2966-2971.

Figures/Tables 3

Fig. 1 Total phenol content in leaves of resistant and susceptible cassava cultivars before and after damaged by P. marginatus Different uppercase letters indicate significant difference in the same cultivar at different time (P<0.05), and different lowercase letters indicate significant difference among different varieties at the same time (P<0.05).

Fig. 2 MAD content in leaves of resistant and susceptible cassava cultivars before and after damaged by P. marginatus Different uppercase letters indicate significant difference in the same cultivar at different time (P<0.05), and different lowercase letters indicate significant difference among different varieties at the same time (P<0.05).

Fig. 3 Tannin content in leaves of resistant and susceptible cassava cultivars before and after damaged by P. marginatus Different uppercase letters indicate significant difference in the same cultivar at different time (P<0.05), and different lowercase letters indicate significant difference among different varieties at the same time (P<0.05).

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