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Cloning and differential expression analysis of defensin gene Cldef2.2 from watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai)

文献类型： 外文期刊

作者： Zhang, M. 1 ; Yang, X. P. 1 ; Xu, J. H. 1 ; Liu, G. 1 ; Yao, X. F. 1 ; Li, P. F. 1 ; Zhu, L. L. 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Nanjing, Jiangsu, Peoples R China

关键词： watermelon;plant defensin-like gene;gene cloning;expression analysis

期刊名称：XXIX INTERNATIONAL HORTICULTURAL CONGRESS ON HORTICULTURE: SUSTAINING LIVES, LIVELIHOODS AND LANDSCAPES (IHC2014): INTERNATIONAL SYMPOSIUM ON MOLECULAR BIOLOGY IN HORTICULTURE

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收录情况： SCI

摘要： Plant defensins (PDFs) are small cysteine rich peptides with potential antifungal activity. In this work, a defensin-like cDNA of 237 bp was cloned from watermelon and named CIdef2.2 (GenBank accession No. KC481268). The amino acid sequence deduced from the coding region comprised 78 amino acids with a predicted molecular mass of 8.65 KD and isoelectric point of 8,325. Sequence alignment showed that Cldef2.2 had high amino acid homology to known PDF proteins from other plant species and contained thehighly conserved eight cysteine motif. Phylogenetic analysis indicated that Cldef2.2 belongs to the Arabidopsis PDF2 cluster and is close to AtPDF2.5. Real-time PCR analysis revealed that CIdef2.2 was expressed in all the examined tissues, including leaves, roots, and stems. The highest expression level was observed in roots. We also investigated the differential expression profiles of Cldef2.2 gene in response to signalling molecules such as salicylic acid (SA), methyl jasmonate (MeJA) and ethylene orin response to Fusarium oxyporum f. sp. niveum (FON) challenge. For signalling molecules, Cldef2.2 was shown to be quickly induced by MeJA at 4 h after treatment (hat), while its response to ethylene and SA was relatively slow with the expression peaking at 48 hat. For FON challenge, Cldef2.2 showed highly responsive with niRNA accumulation peaking at 4 h after inoculation (hai).

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