Читать книгу Horticultural Reviews, Volume 49 - Группа авторов - Страница 22

Breeding for root rot resistance should be a priority in H. quercifolia, considering the disease is often lethal. No resistance genes have been reported to date, but by screening diverse, wild germplasm, the possibility exists to find tolerant material. Opportunities for high throughput screening for resistance to Phytophthora has been demonstrated in crops such as Nicotiana, Solanum, and Lycopersicon using culture filtrates incorporated into a tissue culture medium (Behnke 1979; van den Bulk 1991). Although promising, more information about the host–pathogen interaction is needed in order to implement such procedures in H. quercifolia. Because Phytophthora is a vascular disease and may not use a chemical toxin as a pathogenic mechanism, screening with culture filtrates may not be a viable option. Instead, it may be necessary to screen seedlings by inoculating with the pathogen itself to identify variation in tolerance. Screening for Armillaria root rot is also a possibility, as high‐throughput procedures for field inoculations have been published (Beckman and Pusey 2001). Selecting for tolerance to foliar pathogens is also highly desirable, as foliar pathogens have an ability to induce an unsightly appearance to plants in production as well as in the landscape.