Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (36): 93-99.doi: 10.11924/j.issn.1000-6850.casb20191201004

Special Issue: 烟草种植与生产

Previous Articles     Next Articles

The Function of Defense Signaling Pathways: Tobacco Resistance to Myzus persicae Induced by Bemisia tabaci

Xu Yanan(), Sun Xia, Zhao Haipeng, Xue Ming()   

  1. College of Plant Protection, Shandong Agricultural University, Tai’an Shandong 271018
  • Received:2019-12-28 Revised:2020-01-29 Online:2020-12-25 Published:2020-12-23
  • Contact: Xue Ming E-mail:sdauzbxyn@163.com;xueming@sdau.edu.cn

Abstract:

Bemisia tabaci infection can induce the tobacco resistance to Myzus persicae. The study aims to investigate the relationship between the defense signaling of salicylic acid (SA) and jasmonic acid (JA) and the resistance to Myzus persicae induced by Bemisia tabaci. The effects of Bemisia tabaci nymphs feeding on SA and JA level and downstream defense genes expressing level were tested, and the effects of exogenous SA and JA on the growth and development of Myzus persicae were analyzed by biochemical analysis and real-time fluorescent quantitative PCR. The results showed that Myzus persicae infection obviously activated SA defense pathway. After feeding 15 d, the SA level was 1.40-fold higher than the control, and the levels of PR-1a and PR-2a were increased by 3.22 times and 0.74 times, respectively. JA level was not obviously affected, while the transcript levels of JA downstream defense genes PI-II and TPI were decreased by 73.91% and 56.73%, respectively. Biochemical analysis revealed that the application of exogenous SA was harmful to the survival and the relative average growth rate of M. persicae. Treating with 1 mmol/L SA, aphid survival and growth rate were decreased by 43.2% and 11.54%, respectively, compared with the control. Methyl jasmonate had no harmful effect on the growth and development of Myzus persicae. In conclusion, SA mediated defense response contributes to the tobacco resistance against M. persicae.

Key words: Bemisia tabaci, interspecific competition, jasmonic acid, Myzus persicae, salicylic acid, induced defense

CLC Number: