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Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (2): 281-292.doi: 10.16420/j.issn.0513-353x.2021-0045

• Research Papers • Previous Articles     Next Articles

Cloning and Function Analysis of Mycorrhizal Signaling Receptor Protein Lysin Motif Receptor-like Kinases 2 Gene(LYK2)in Citrus

SONG Fang, LI Zixuan, WANG Ce, WANG Zhijing, HE Ligang, JIANG Yingchun, WU Liming(), BAI Fuxi()   

  1. Fruit and Tea Subcenter of Hubei Innovation Center of Agricultural Science and Technology,Institute of Fruit and Tea,Hubei Academy of Agricultural Sciences,Wuhan 430064,China
  • Received:2021-11-09 Revised:2022-01-07 Online:2022-02-25 Published:2022-02-28
  • Contact: WU Liming,BAI Fuxi E-mail:wuliming2005@126.com;baifx@webmail.hzau.edu.cn

Abstract:

Twelve CsLYK genes were annotated from Citrus sinensis genome,which were unevenly distributed on six chromosomes,including chr1,chr2,chr6,chr7,chr8 and chr9. The conserved domain analysis showed that seven conserved motifs were detected at 3′ terminator of CsLYKs,and the constructions of these seven motifs were highly conserved. However,only three conserved motifs were detected at 5′ terminator of CsLYKs,and the constructions of these three motifs were highly variable. Gene structure analysis showed that CsLYK2,CsLYK3,CsLYK6,CsLYK10 and CsLYK12 had no introns,while other seven CsLYK family members had one to nineteen introns. Phylogenetic analysis revealed that twelve CsLYKs could be divided into three groups and CsLYK2 was clustered together with PaNFP and SlLYK10 in a small brunch. The expression analysis revealed that all PtrLYK genes were expressed in the root,stem and leaf of P. trifoliata. In details,the expression of PtrLYK10 was more abundant in the roots than leaf and stem,and the expression of PtrLYK3,PtrLYK7,PtrLYK8,PtrLYK9 and PtrLYK12 were more abundant in the leaf. Additionally,the expression of PtrLYK2 was induced in the roots of poncirus during different mycorrhizal infection periods,and the highest expression level was observed at two weeks post inoculation. The subcellular localization vector,35S-PtrLYK2-CFP,was transiently expressed in the protoplast of Arabidopsis thaliana. The result of laser scanning Confocal microscope indicated that PtrLYK2 was expressed on the plasma membrane. The promoter expression vector,proPtrLYK2::GUS, was transiently expressed in M. truncatula hair root,and the positive roots were screened with Ds-Red report gene and inoculated with AM fungi. After GUS histochemical staining and WGA-488 mycorrhizal staining,the expression of proPtrLYK2 was observed in the cells around arbuscules and the root tip cells. Taken together,these results indicated that PtrLYK2 played a significant role in symbiotic signaling recognition at early stage between citrus and AM fungi.

Key words: Citrus, arbuscular mycorrhizal fungi, LysM receptor-like kinases, subcellular localization, promoter

CLC Number: