Reactions of Thirty-N ine Accessions of Four Cucurbita Species from Different Origin TO Seven Viruses

Horváth, József (1993) Reactions of Thirty-N ine Accessions of Four Cucurbita Species from Different Origin TO Seven Viruses. ACTA PHYTOPATHOLOGICA ET ENTOMOLOGICA HUNGARICA, 28 (2-4). pp. 415-425. ISSN 0238-1249

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Abstract

In the course of examining the relation of 30 accessions of 3 Cucurbita species (C. moschata, C. ecuadorensis, C. texana) and 9 cultivars of Cucurbita pepo to 7 viruses we detected 249 host-virus relations of which 103 were resistant or immune and 146 susceptible. From the point of view of resistance remarkable was the Cucurbita moschata of which 24 accessions were immune to the cucumber green mottle mosaic Tobamovirus (CGMMV), 16 accessions to the cucumber mosaic Cucumovirus (CMV), 9 accessions to the cucumber fruit streak virus (CFSV), 3 accessions to the cucumber leaf spot Carmovirus (CLSV) and 2 accessions to the melon necrotic spot Carmovirus (MNSV) and 2 to the zucchini yellow mosaic Potyvirus (ZYMV). The susceptible accessions were: 23 to watermelon mosaic-2 Potyvirus (WMV-2), 20 to CLSV, 18 to MNSV, 13 to CFSV, 8 to CMV and 1 to CGMMV. Four accessions of Cucurbita ecuadorensis were immune to CGMMV, 2 accessions to ZYMV, while 1 accession of it to CLSV and again 1 to MNSV. The 285213 accession of Cucurbita texana was immune to CFSV, CGMMV and MNSV, and susceptible to CLSV, CMV, WMV-2 and ZYMV. Immunity to CFSV was shown by some Cucurbita pepo cultivars (Yellow Oval, Green Marrow, Salad Melon, Calabasa). All Cucurbita pepo cultivars were immune to CGMMV. Some cultivars (Little Gem, ovifera, Salad Melon, Super Squash, Calabasa) were found to be immune to CMV, and further cultivars (Yellow Oval, Green Marrow, Little Gem, Calabasa, Omaha Pumpkin) showed immunity to MNSV. All Cucurbita pepo cultivars were susceptible to CLSV, WMV-2 and ZYMV. To 6 of the 7 viruses the following species and accessions were susceptible: Cucurbita moschata (172344, 200822, 267754, 286421, 357918), C. ecuadorensis (432444, 432445). To 5 viruses susceptibility was shown by Cucurbita moschata (163288, 165033, 192942, 199014, 306125, 369346), C. ecuadorensis 432442, C. pepo cv. ovifera 196309 and C. pepo cv. Omaha Pumpkin 302418. Futher 18 accessions proved susceptible to four, 3 accessions to three and 2 accessions to two viruses.

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