Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (2): 161-171.doi: 10.13560/j.cnki.biotech.bull.1985.2022-0500

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Study on the Expression Pattern of Genes in Lignin Biosynthesis Pathway of Cassava Resisting to Tetranychus urticae

YAO Xiao-wen1,2,3(), LIANG Xiao2,3, CHEN Qing2,3(), WU Chun-ling2,3, LIU Ying2,3, LIU Xiao-qiang2,3, SHUI Jun1,2,3, QIAO Yang1,2,3, MAO Yi-ming1, CHEN Yin-hua1, ZHANG Yin-dong1   

  1. 1. College of Tropical Crops, Hainan University, Haikou 571000
    2. Environment and Plant Protection Institute, China Academy of Tropical Agricultural Sciences, Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture and Rural Affairs, Hainan Engineering Research Center for Biological Control of Tropical Crops Diseases and Insect Pests, Haikou 571101
    3. Sanya Research Academy, Chinese Academy of Tropical Agriculture Science, Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions, Sanya 572000
  • Received:2022-04-22 Online:2023-02-26 Published:2023-03-07

Abstract:

Lignin is an important physicochemical barrier for crops to defend against pests, however, its mechanism of cassava resistance to insect remains unclear. In order to explore the role of lignin biosynthesis pathway genes in cassava resisting to Tetranychus urticae(two-spotted spider mite, TSSM), the mite-resistant cassava cultivar C1115, Myanmar, SC9 and mite-susceptible cassava cultivar SC205, Bread and BRA900 were applied during mite-cassava interaction. Furthermore, real-time quantitative PCR was used to analyze the expression pattern of lignin biosynthesis pathway genes(PAL, 4CL, C4H, HCT, CSE, COMT, CCoAOMT, F5H, CCR and CAD)among different cultivars infested by TSSM at different times of 0, 1, and 4 d. The results showed that the expressions of C4H, HCT, CSE, F5H and CAD in TSSM-infested mite-resistant and mite-susceptible cassava cultivars generally increased compared with those before infestation, but they did not always show significant differences, in addition, there was no significant difference in the expressions of these five genes among the mite-resistant and mite-susceptible cassava cultivars at the identical TSSM infested time. On the contrary, compared with those before infestation, the expressions of PAL, 4CL, CCoAOMT and CCR significantly increased in the TSSM infested mite-resistant cassava cultivars. However, the expressions of those four genes in mite-susceptible cultivars were either unchanged or significantly decreased, moreover, during the same mite-infested time, the expressions of these four genes in mite-resistant cassava cultivars were generally higher than those in mite-infested cassava cultivars, especially when the cassava plants were infested by TSSM at 4 d. Further correlation analysis found that the increase in the expressions of these four genes was significantly and positively correlated with the resistance of cassava to mite. To sum up, the above results speculated that the expressions of lignin biosynthesis pathway genes PAL, 4CL, CCoAOMT and CCR may be probably related to the resistance level of cassava cultivars.

Key words: cassava(Manihot esculenta Crantz), Tetranychus urticae, lignin biosynthesis pathway, gene expression, mite-resistant and mite-susceptible cassava cultivars, mite infestation time, correlation of resistance