Rosa-Valentín, Giseiry M.

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    Tres potyvirus que afectan las cucubitáceas en Puerto Rico: resistencia genética y comportamiento biolóco
    (2012) Rosa-Valentín, Giseiry M.; Wessel-Beaver, Linda; College of Agricultural Sciences; Verle Rodríguez, Jose Carlos; Estévez de Jensen, Consuelo; Van Bloem, Skip; Department of Crops and Agro-Environmental Sciences; Vélez Díaz, Ana
    Tropical pumpkin (Cucurbita moschata) and watermelon (Citrullus lanatus) are the most important cucurbit crops in Puerto Rico (PR). Potyviridae is an important family of viruses that severely affects these crops in PR. Among these viruses are: Squash vein yellowing virus (SqVYV), Papaya ringspot virus (PRSV) and Zucchini yellow mosaic virus (ZYMV). An experiment was conducted with each of these viruses. In Experiment 1, USDA accessions not in the watermelon core collection were tested for SqVYV resistance. Accessions were inoculated, and disease severity and absorbance (ELISA) were evaluated in the field. In Experiment 2, the biological behavior of a collection of PRSV strains from PR were tested in susceptible and resistant lines of tropical pumpkin and in susceptible lines of watermelon. Plants were inoculated and severity of symptoms and absorbance were measured. In Experiment 3, accessions of C.lanatus and C. citroides previously identified as resistant to ZYMV were inoculated with the local ZYMV strain. Severity of ZYMV and absorbance were observed to determine if these accessions are also resistant to this strain. No watermelon accessions evaluated for SqVYV showed complete resistance (defined as symptom free and negative ELISA), but some demonstrated moderate levels of resistance, particularly PI277997 and PI526237. Strains 874 and 903 of PRSV caused more severe symptoms on pumpkin and watermelon than the standard strain 231. These strains were also able to infect Cucurbita moschata cv. Nigerian Local, a cultivar that has previously been always resistant to PRSV. Subsequently, tissues of these plants of Nigerian Local were able to infect susceptible genotypes of C. moschata cv. Waltham and Citrullus lanatus cv. Sugar Baby and Crimson Sweet. C. citroides PI537277 was highly resistance to the local strain of ZYMV, while C. lanatus accessions PIs 485580, 494528, 494529, 595200, 595201, and 595203 were moderately resistant to ZYMV.