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Histological differences between watermelon grafted onto bottle gourd rootstock and self-rooted seedlings inoculated with Fusarium oxysporum f. sp niveum

文献类型： 外文期刊

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

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vegetable Crops, Nanjing 210014, Peoples R China

关键词： Anatomy;Fusarium oxysporum f. sp niveum;grafting;tyloses;watermelon

期刊名称：CUCURBITACEAE 2012: PROCEEDINGS OF THE XTH EUCARPIA MEETING ON GENETICS AND BREEDING OF CUCURBITACEAE

ISSN：

年卷期： 2012 年

页码：

收录情况： SCI

摘要： Effects of grafting on disease control and fruit quality of watermelon have been widely documented, while little work has been done on the histological response of the grafted plants to the pathogen. In this work, susceptible watermelon cultivar, 'Sumi No. 1', was grafted onto fusarium wilt resistant bottle gourd (Lagenaria siceraria) 'Chaofeng', the grafted and self-rooted plants were inoculated with Fusarium oxysporum f. sp. niveum race 1 (FON 1) and the histological response of roots and hypocotyls was examined. In roots of self-rooted plants, infected xylem vessels were usually plugged with gums or tyloses, few occluded vessels were shed from the roots. Parenchyma cell surrounding the vascular cylinder were observed with cell wall thickened, cell disintegration and eventually formed cavities. In roots of grafted plants, only gums and tyloses in infected xylem vessels, together with the thickening of xylem parenchyma cell wall were observed. Moreover, we found that FON 1 caused a quick defense response in grafted plants compared with that in self-rooted plants, suggesting the earlier formation of barrier to fungal invasion. Hypocotyls of most self-rooted plants were colonized. Plenty of hyphae were seen in vascular tissues, the diseased vascular bundle finally became hollow and plants developed wilt symptoms, while most grafted plants' shoots did not colonized by pathogen and the plants became healthy. This work provides anatomical basis for fusarium wilt control in watermelon by grafting.

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