期刊论文详细信息
Horticultura Brasileira
Reaction of melon genotypes to the gummy stem blight and the downy mildew
Gil R Dos Santos2  Manoel D De Castro Neto2  Leandro N Ramos1  Adalberto C Café-filho1  Ailton Reis1  Valéria G Momenté2  Joenes M Pelúzio2  Maíra Ignácio2 
[1] ,Universidade Federal do TocantinsGurupi TO
关键词: Cucumis melo;    Didymella bryoniae;    Pseudoperonospora cubensis;    genetic resistance;    Cucumis melo;    Didymella bryoniae;    Pseudoperonospora cubensis;    resistência genética;   
DOI  :  10.1590/S0102-05362009000200007
来源: SciELO
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【 摘 要 】

The gummy stem blight (Didymella bryoniae) and the downy mildew (Pseudoperonospora cubensis) are two foremost melon (Cucumis melo) diseases, considering their effects on yield and fruit quality. Despite the importance of such diseases, relatively few studies have been done so far on the identification of resistance sources to D. bryoniae and P. cubensis in Brazil. This work aimed at evaluating the resistance of commercial melon genotypes to the gummy stem blight and the downy mildew. Firstly, the most aggressive and representative D. bryoniae isolate was selected. Subsequently, the resistance of 86 melon genotypes to stem infection was studied upon greenhouse conditions by inoculating with the previously selected isolate. Afterwards, the resistance to mildew and leaf infection by D. bryoniae of 28 melon genotypes was evaluated in the field, under natural infection. In the greenhouse, all 86 melon genotypes were infected and showed stem infection symptoms caused by D. bryoniae four days after inoculation. Nevertheless, a significant variation on the resistance levels of the melon genotypes was found. Under field conditions and natural inoculation, genotypes Taslaki and Sary Juliabi were the most susceptible to leaf infection by D. bryoniae, significantly differing from the other genotypes. The lowest levels of susceptibility were identified in genotypes Perlita Busle S1, Valenciano Elíptico, Glaver, MR1, and 2526. All genotypes were susceptible to the downy mildew, albeit differing in susceptibility levels.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License

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