https://www.ahs.ac.cn/images/0513-353X/images/top-banner1.jpg|#|苹果
https://www.ahs.ac.cn/images/0513-353X/images/top-banner2.jpg|#|甘蓝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner3.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner4.jpg|#|灵芝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner5.jpg|#|桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner6.jpg|#|黄瓜
https://www.ahs.ac.cn/images/0513-353X/images/top-banner7.jpg|#|蝴蝶兰
https://www.ahs.ac.cn/images/0513-353X/images/top-banner8.jpg|#|樱桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner9.jpg|#|观赏荷花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner10.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner11.jpg|#|月季
https://www.ahs.ac.cn/images/0513-353X/images/top-banner12.jpg|#|菊花

Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (12): 2701-2712.doi: 10.16420/j.issn.0513-353x.2022-1208

• Plant Protection • Previous Articles     Next Articles

Studies on Function and Mechanism of CsNAC2 Transcription Factor in Resistance to Green Mold in Citrus

CHEN Qi1(), LI Ting1, CHEN Jialin1, CHEN Ou1, WANG Wenjun1,2, YAO Shixiang1,2, ZENG Kaifang1,2,3,*()   

  1. 1 College of Food Science,Southwest University,Chongqing 400715,China
    2 Research Center of Food Storage & Logistics,Southwest University,Chongqing 400715,China
    3 National Citrus Engineering Technology Research Center,Chongqing 400712,China
  • Received:2023-01-18 Revised:2023-05-08 Online:2023-12-25 Published:2023-12-29
  • Contact: ZENG Kaifang

Abstract:

In order to investigate the effect of citrus transcription factor CsNAC2 on resistance to green mold,the coding sequence of CsNAC2 was cloned using‘Jincheng 447'as study material. Bioinformatics analysis,yeast one-hybrid assay,RNA-Seq,EMSA and qRT-PCR were employed to explore the regulatory function of CsNAC2 on fruit green mold resistance. The results showed that the coding sequence of CsNAC2 is 909 bp,encoding 302 amino acids,and the molecular weight of the protein is 34.40 kD. CsNAC2 possesses the structural characteristics of the NAC family and contains conserved NAC domain in the N terminal. Transient overexpression of CsNAC2 on citrus fruit could effectively reduce the incidence of green mold in fruit,with a considerable decrease in incidence and spot diameter. Transcriptomic analysis showed that CsNAC2 can participate in several metabolic pathways related to disease resistance in fruits. Further studies on lignin synthesis pathway,amino acid and nucleotide sugar metabolism pathway showed that CsNAC2 can bind the CsLAC7 and CsEP3 gene promoters in these two pathways,respectively. Transient overexpression of CsNAC2 increased the expression of CsLAC7 and CsEP3 genes. The comprehensive results indicated that CsNAC2 may activates the expression of CsLAC7 and CsEP3 genes to enhance the resistance to green mold in citrus fruits.

Key words: citrus, green mold, transcription factor CsNAC2, disease resistance, molecular mechanism