Sources of Bacterial Spot Resistance in Japanese-Type Plum Cultivars
DOI:
https://doi.org/10.71318/apom.1990.44.1.32Keywords:
Xanthomonas campestrispv. pruni, plum breeding, PrunusspeciesAbstract
This review compares the species composition of 18 bacterial spot ( Xanthomonas campestrispv. pruni) resistant Japanese-type plum cultivars ( Prunus salicinaand hybrids) to that of 8 susceptible plum cultivars. P. salicinaaccounted for about 58% of the species in both the resistant and susceptible groups. P. cerasifera(22%), P. angustifolia(6%) and P. munsoniana(3%) were present only in the resistant cultivars. P. americanaand P. simoniiwere in both groups but more commonly in the susceptible cultivars. Resistant cultivar releases from breeding programs at Alabama, Georgia, South Africa and Australia were compared for species composition. The level of P. salicinavaried from 50-63%. P. cerasiferawas most common in cultivars from Australia (31%) and Alabama (28%) and P. angustifoliawas present only in cultivars from Georgia (13%) and Alabama (5%). Combination of germplasm from the 4 programs would capitalize on the different parent cultivars and species involved in each. P. cerasifera, P. angustifoliaand possibly P. salicinaare considered major sources of resistance to bacterial spot.
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