Summary
Several types of resistance to fungal pathogens of cane fruits have been identified by controlled infection procedures and incorporated into the UKRubus breeding programme. These are reviewed with a description of the biology of the pathogens involved. Some of them take the form of a mechanical barrier associated with the position and rate of development of suberised periderms. For example, damage to the deep-seated cane polyderm occurs whenLeptosphaeria coniothyrium (cane blight) infects the phloem and xylem, but forms of resistance which restrict the expansion of these vascular lesions have been found.
Wound periderms, which form rapidly around natural splits in the primary cortex, play an important role in resistance of some genotypes to midge blight (Resseliella theobaldi and its associated fungal pathogens). However, they are less effective againstElsinoe veneta (cane spot) which attacks canes early in cane differentiation before functional periderms have arisen. Other resistances are associated with distinctive morphological traits, most notably cane pubescence. This character is controlled by geneH and is associated with useful resistance toBotrytis cinerea (cane botrytis) andDidymella applanata (spur blight), but has the disadvantage that it is associated with increased susceptibility toE. veneta, Sphaerotheca macularis (powdery mildew) andPhragmidium rubi-idaei (raspberry yellow rust). These associations present a dilemma for breeders, but other sources of resistance to these pathogens have been identified that are strong enough to overcome this disadvantage.
From studies of inheritance it is concluded that a major gene determines one form of resistance toPhragmidium rubi-idaei and that three major genes determine resistance toS. macularis. Minor genes acting additively determine all the other resistances, though major genes may be involved in cane resistance toBotrytis cinerea and resistance toElsinoe veneta, which were inherited without diminution over several generations. In two instances a common resistance to two diseases was discovered.
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Williamson, B., Jennings, D.L. Resistance to cane and foliar diseases in red raspberry (Rubus idaeus) and related species. Euphytica 63, 59–70 (1992). https://doi.org/10.1007/BF00023912
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DOI: https://doi.org/10.1007/BF00023912