Potyvirus resistant cucurbit plants
The potyvirus group (named for its prototypical member, potato virus Y) is the largest of the 34 plant virus groups and families currently. This group contains at least 180 definitive and possible members (30% of all known plant viruses) which cause significant losses in agricultural, pastoral, horticultural and ornamental crops.
A major problem in squash cultivation is the occurrence of potyviruses damaging plants and fruits. There are at least four potyviruses which most frequently infect squash - Zucchini Yellow Mosaic Virus (ZYMV), Watermelon Mosaic Virus (WMV), Papaya Ringspot Virus (PRSV) and Moroccan watermelon mosaic virus (MWMV). The symptoms of potyvirus disease in squash include mosaicking, yellowing, shoestring leaves, stunting, and fruit and seed deformation.
This invention describes Potyvirus resistant plants that display a wide spectrum of resistance to viruses such as Zucchini Yellow Mosaic Virus (ZYMV), Watermelon Mosaic Virus (WMV), Papaya Ringspot Virus (PRSV) and Moroccan watermelon mosaic virus (MWMV). This resistance is conferred by at least 3 recessive genetic determinants that have been introduced into a squash plant by interspecific crossing and embryo rescue. The molecular markers used to introgress this native trait into commercial squash varieties are described and available.
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Access to trait know-how and molecular markers to increase the efficiency with which the trait can be introduced into the market will be negotiated as a lump-sum fee or an additional royalty rate.