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《Plant Protection》 2014-03
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Histological observation of watermelon root and stem infected by Fusarium oxysporum f.sp.niveum

Wei Junge;Sun Haiyan;Li Wei;Deng Yuanyu;Zhang Aixiang;Chen Huaigu;College of Plant Protection,Nanjing Agricultural University;Institute of Plant Protection,Jiangsu Academy of Agricultural Sciences;  
In order to observe the infection process of Fusarium oxysporumf.sp.niveum(FON)in watermelon root and stem,the strain FO1022with high virulence was selected and the green fluorescent protein was transformed into this pathogen to observe the infection process.The results showed that in the susceptible cultivar‘Sumi No.1' two days after inoculation,conidia of FO1022-GFP were found to attach the watermelon root epidermis and germinated;the preferential colonization sites on the root surface were the grooves along the junctions of adjacent epidermal cells.At day 5after inoculation,massive hyphae and macroconidia of the fungal pathogen were observed in xylem vessels of the watermelon root,and massive chlamydospores were observed in the root epidermis,while only a few hyphae were observed in xylem vessels of the watermelon stem;at this stage,48.6% of the seedlings appeared to wilt.At day 9after inoculation,all xylem vessels of the watermelon stem were clogged by massive hyphae,and 91.7% of the seedlings appeared to exsiccate.Compared to the infection process in susceptible cultivar,this pathogen infected more slowly in the moderately-resistant or resistant cultivar.The infection process of FO1022-GFP in watermelon root and stem was observed and analyzed by histopathological observation,which provides a reference for exploring the pathogenic mechanism of this pathogen.
【Fund】: 江苏省农业科技自主创新项目(CX(11)4014)
【CateGory Index】: S436.5
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