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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (10): 2271-2287.doi: 10.16420/j.issn.0513-353x.2022-0835

• Plant Protection • Previous Articles     Next Articles

Screening and Identification of E3 Ubiquitin Ligase Genes Relate to Bacterial Wilt Resistance in Eggplant

WANG Yixi, YAN Shuangshuang, YU Bingwei, GAN Yuwei, QIU Zhengkun, ZHU Zhangsheng, CHEN Changming, CAO Bihao*()   

  1. Key Laboratory of Biology & Genetic Improvement of Horticultural Crops,Ministry of Agriculture and Rural Affairs,Guangdong Vegetable Engineering & Technology Research Center,College of Horticulture,South China Agricultural University,Guangzhou 510642,China
  • Received:2023-04-28 Revised:2023-05-09 Online:2023-10-25 Published:2023-10-31

Abstract:

Eggplant is vulnerable to bacterial wilt in production. In order to investigate eggplant bacterial wilt resistance genes,previously,the transcriptome of highly resistant inbred line and susceptible inbred line were performed and analyzed. Four E3 ubiquitin ligase genes related to bacterial wilt resistance,including SmSP1SmSPL2SmDDA1a1,and SmDDA1a2 were obtained. Sequence analysis showed that the domains of four E3 ligase proteins were conservative among seven species. SmSP1 and SmSPL2 belonged to RING type E3 ligase,SmDDA1a1 and SmDDA1a2 belonged to CRLDDB type E3 substrate receptor. The subcellular localization results indicated that SmDDA1a2 was localized in the nucleus,and SmSP1,SmSPL2 and SmDDA1a1 were localized in the nucleus and other cell sites. The four genes were expressed in the roots,stems and leaves of eggplant,and the highest expression was found in the leaves. The expression of four genes were induced by Ralstonia solanacearum and exogenous hormones,and higher in resistant materials than in susceptible materials. SmSP1 was induced by salicylic acid,SmSPL2SmDDA1a1 and SmDDA1a2 were induced by methyl jasmonate,and all four genes were induced by ethephon. Function identification by VIGS demonstrated that silencing of SmSP1 and SmDDA1a2 in resistant materials led to the decline of plant resistance to bacterial wilt,and silencing of SmSPL2 and SmDDA1a1 in resistant materials did not affect the plant resistance to bacterial wilt. These results suggested that SmSP1 and SmDDA1a2 may be involved in the regulation of eggplant bacterial wilt resistance.

Key words: eggplant, bacterial wilt, E3 ubiquitin ligase, expression analysis, functional identification