Affiliation:
1. Institute of Vegetable and Flower of Shandong Academy of Agricultural Sciences, Jinan 250100, China
2. Shandong Institute of Pomology, Taian 271000, China
Abstract
Cherry leaf spot (CLS), caused by Passalora circumscissa, is a
fungal disease that can cause decreased fruit quality and yield via inconsistent
ripening or premature defoliation. Germplasm resource screening is the most
reliable approach to disease control for economically important crops. However,
information is limited in China about the resistance of cherry cultivars to leaf
spot caused by P. circumscissa. The aim of this study was to
identify the resistance levels of cherry cultivars. Fifty-two cherry cultivars,
including 40 Prunus avium, four Prunus
pseudocerasus, and eight Prunus cerasus cultivars
were collected for resistance level characterization. These specimens were then
used to screen for P. circumscissa resistance through both
detached leaf assays and natural field infection. Significant differences in the
disease index (DI) value among test cultivars, ranging from 5.7 (resistant) to
53.7 (highly susceptible) and 6.5 (resistant) to 53.2 (highly susceptible), were
observed under the controlled and field conditions respectively. Correlation
coefficients between DI in pairs of years were highly significant
(0.77–0.86). Although resistance rankings for cherry cultivars between
screening methods were variable, the resistance levels of 52 cultivars evaluated
under controlled and field condition were comparable with a correlation
coefficient of 0.70 (P < 0.01). The results indicated
that, across cherry cultivars, responses to CLS in the detached leaf assay
corresponded well to responses under field conditions. A detached leaf assay was
developed as a complementary method to facilitate the screening of cherry
cultivars for resistance to leaf spot caused by P.
circumscissa. Our study provides a theoretical basis for cherry disease
resistance breeding and rational cultivar utilization.
Publisher
American Society for Horticultural Science
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