Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (6): 211-220.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0993

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Influence on Expression of Jasmonic Acid Signaling Pathway Gene in Tetranychus urticae Fed on Mite-resistant and Mite-susceptible Cassava Cultivars

HAN Zhi-ling1,2,3(), CHEN Qing2,3(), LIANG Xiao2,3, WU Chun-ling2,3, LIU Ying2,3, WU Mu-feng2,3, XU Xue-lian2   

  1. 1. College of Plant Protection of Hainan University,Haikou 570228
    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,Haikou 571101
    3. Sanya Institute,China Academy of Tropical Agricultural Sciences/Hainan Key Laboratory for Biosafety Monitoring and Molecular Breeding in Off-Season Reproduction Regions,Sanya 572000
  • Received:2021-08-06 Online:2022-06-26 Published:2022-07-11
  • Contact: CHEN Qing E-mail:hb18831321679@126.com;chqingztq@163.com

Abstract:

This study aims to clarify how the mite density and feeding time affect gene expressions of jasmonic acid signaling pathway when Tetranychus urticae fed on mite-resistant and mite-susceptible cassava cultivars,which can not only provide a theoretical basis for elucidating the important role of jasmonic acid signal pathway in cassava resistance to insect,but also can offer references for identifying and evaluating mite resistant germplasm resources. Here,mites with different densities(15,25,35,45,50 and 55 mites/leaf)were inoculated on the leaves of mite-resistant cassava cultivar C1115 and mite-susceptible cassava cultivar Mianbao,respectively. And then the expressions of jasmonic acid signaling pathway genes(DAD1,LOX2,OPR3 and JAR1)were analyzed at 1,2,4 and 8 d post-infestation,respectively. The results showed that the expressions of LOX2,OPR3 and JAR1 in 2 d post-infestation either mite-resistant cassava C1115 and mite-susceptible cassava Mianbao significantly increased compared with those before infested,in addition,the expressions of those three genes were significantly higher in C1115 than Mianbao(P<0.05),while the expressions of DAD1 showed great fluctuation as the mite density and infestation time increased. This study revealed that under the conditions of relative high mite density and short mite infestation period,the expressions of jasmonic acid signaling pathway genes like LOX2,OPR3 and JAR1 were significantly higher in mite-resistant cassava cultivars compared with the susceptible ones. Those genes might probably correlate with cassava resistance to mite,which needs further investigation.

Key words: Tetranychus urticae, mite-resistant and mite-susceptible cassava cultivars, mite density, mite infestation time, jasmonic acid signaling pathway, gene expression