Xuewu Wang¹ , Huifang Wang² , Kai Rui² , Tianqi Wang² , Miancai Chen^1,2

1 College of Plant Protection, Hainan University, Haikou, 570228, China
2 Key Laboratory of Plant Diseases and Pest Control of Hainan Province, Institute of Plant Protection, Hainan Academy of Agricultural Sciences, Haikou, 571100, China
Author    Correspondence author
Molecular Plant Breeding, 2022, Vol. 13, No. 24   doi: 10.5376/mpb.2022.13.0024
Received: 29 Aug., 2022    Accepted: 14 Oct., 2022    Published: 05 Nov., 2022

This article was first published in Molecular Plant Breeding in Chinese, and here was authorized to translate and publish the paper in English under the terms of Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Wang X.W., Wang H.F., Rui K., Wang T.Q., and Chen M.C., 2022, Cloning and expression characteristics analysis of HcNPR1 gene related to root-knot nematode in kenaf, Molecular Plant Breeding, 13(24): 1-10 (doi: 10.5376/mpb.2022.13.0024)

In order to excavate the related resistant genes in kenaf to root-knot nematodes and explore the molecular mechanism of the interaction between kenaf and root-knot nematodes, based on the obtained gene NPR1 related to root-knot nematode from kenaf by the transcriptome sequencing, the PCR and RACE technology were used to clone the full length of gene NPR1 in kenaf, and the gene was named as HcNPR1 in this study. The cDNA of resistant gene HcNPR1 to root-knot nematode has a full length of 2 058 bp, and its gene open reading frame (ORF) is 1 776 bp (Chr: 164-1939), which encodes a protein of 591 amino acids, with an isoelectric point of 6.02 and a molecular weight of 65.321 ku. This gene has 4 conserved domains of NPR1 gene shared by the plants. Real-time RT-PCR results showed that the expression of HcNPR1 gene changed significantly in kenaf after stress of 1 mmol/L jasmonic acid (JA), 1 mmol/L salicylic acid (SA) and 2 mmol/L ethylene (ET). The gene HcNPR1 expression induced by JA and ET was significantly stronger than that by SA. The expression of HcNPR1 gene reached the maximum when it was treated by SA for 12 hours, and the time for the strongest induction response of JA and ET was 6 hours. The induction trend of the three hormones increased rapidly first and then decreased. Therefore, it is speculated that the HcNPR1 gene in kenaf plays a role on the resistance to root-knot nematodes. The results of this study can provide a theoretical basis for the genetic improvement of kenaf varieties resistant to root-knot nematode and the prevention and control of kenaf root-knot nematode disease in the future.

Kenaf (Hibiscus cannabinus L.); Root-knot nematode; HcNPR1; Cloning and expression