Abstract
Scab, caused by Venturia nashicola, is the most important disease of Asian pears. In Japan, the most popular and widely grown pear cultivar (cv.) Kousui is resistant to black spot, caused by the Japanese pear pathotype of Alternaria alternata, but highly susceptible to scab. Recently, a new interspecific pear cv. Yutaka carrying high fruit quality was registered officially after a cross between the Chinese pear cv. Hongli and the Japanese pear cv. Housui. Accordingly, tests were conducted to assess resistance of cv. Yutaka to scab, black spot and anthracnose. When conidial suspensions of V. nashicola were spray inoculated onto potted trees, leaves of cv. Yutaka showed no disease symptoms although severe scab development was recorded on the susceptible reference cv. Kousui. Furthermore, neither black spot symptoms nor necrosis formation were observed when leaves of cv. Yutaka were inoculated with conidial suspensions of the A. alternata Japanese pear pathotype or treated with a culture filtrate containing the host-specific AK-toxin of this pathogen, respectively. These results strongly indicate that cv. Yutaka is highly resistant to scab and black spot. Inoculation tests also suggested the potential high levels of resistance of cv. Yutaka to anthracnose caused by Colletotrichum gloeosporioides sensu lato. The introduction of this new pear cultivar will reduce fungicide applications in pear orchards and thus lower the risk of fungicide resistance development in these pathogens.
References
Abe, K., & Kotobuki, K. (1998a). Inheritance of high resistance to Venturia nashicola Tanaka et Yamamoto in Japanese pear (Pyrus pyrifolia Nakai) and Chinese pear (P. ussuriensis Maxim.). Journal of the Japanese Society for Horticultural Science, 67, 677–680.
Abe, K., & Kotobuki, K. (1998b). Polygenic inheritance of necrotic reaction to pear scab (Venturia nashicola Tanaka et Yamamoto) in Japanese pear (Pyrus pyrifolia Nakai) and Chinese pear (P. ussuriensis Maxim.). Journal of the Japanese Society for Horticultural Science, 67, 839–842.
Abe, K., & Kurihara, A. (1993). Species and varietal differences in scab resistance of pear. Journal of the Japanese Society for Horticultural Science, 61, 789–794 (in Japanese with English summary).
Adachi, Y., Shoda, M., Yamamoto, T., Kotobuki, K., & Imada, J. (2004). Pathogenicity of physiological races of Venturia nashicola, causal agent of pear scab to Japanese and Chinese white pear cultivars. Japanese Journal of Phytopathology, 70, 205 (Japanese abstract).
Akagi, Y., Akamatsu, H., Otani, H., & Kodama, M. (2009). Horizontal chromosome transfer, a mechanism for the evolution and differentiation of a plant-pathogenic fungus. Eukaryotic Cell, 8, 1732–1738.
Australian Quarantine & Inspection Service (1998). Final import risk analysis of the importation of fruit of Ya pear (Pyrus bretschneideri Redh.) from the People’s Republic of China (Hebei and Shandong Provinces). http://www.agriculture.gov.au/SiteCollectionDocuments/ba/plant/ungroupeddocs/yapearfira.pdf#search='pear+scab%2C+quarantine+disease'.
Bragança, C. A. D., Damm, U., Baroncelli, R., Massola, J. N. S., & Crous, P. W. (2016). Species of the Colletotrichum acutatum complex associated with anthracnose diseases of fruit in Brazil. Fungal Biology, 120, 547–561.
Caffier, V., Le Cam, B., Expert, P., Tellier, M., Devaux, M., Giraud, M., et al. (2012). A new scab-like disease on apple caused by the formerly saprotrophic fungus Venturia asperata. Plant Pathology, 61, 915–924.
Cannon, P. F., Damm, U., Johnston, P. R., & Weir, B. S. (2012). Colletotrichum - current status and future directions. Studies in Mycology, 73, 181–213.
Chen, S. N., Luo, C. X., Hu, M. J., & Schnabel, G. (2016). Sensitivity of Colletotrichum species, including C. fioriniae and C. nymphaeae, from peach to demethylation inhibitor fungicides. Plant Disease, 100, 2434–2441.
Chung, W. H., Ishii, H., Nishimura, K., Fukaya, M., Yano, K., & Kajitani, Y. (2006). Fungicide sensitivity and phylogenetic relationship of anthracnose fungi isolated from various fruit crops in Japan. Plant Disease, 90, 506–512.
Damm, U., Cannon, P. F., Woundenberg, J. H., & Crous, P. W. (2012). The Colletotrichum acutatum species complex. Studies in Mycology, 15, 37–113.
Fukaya, M. (2004). First report of Japanese pear anthracnose disease caused by Colletotrichum acutatum and its chemical control. Japanese Journal of Phytopathology, 70, 184–189 (In Japanese with English abstract).
Guérin, F., & Le Cam, B. (2004). Breakdown of the scab resistance gene Vf in apple leads to a founder effect in populations of the fungal pathogen Venturia inaequalis. Phytopathology, 94, 364–369.
Ishii, H. (2012). Resistance in Venturia nashicola to benzimidazoles and sterol demethylation inhibitors. In T. S. Thind (Ed.), Fungicide Resistance in Crop Protection. Wallingford (pp. 21–31). CAB International.
Ishii, H., Udagawa, H., Nishimoto, S., Tsuda, T., & Nakashima, H. (1992a). Scab resistance in pear species and cultivars. Acta Phytopathologica et Entomologica Hungarica, 27, 293–298.
Ishii, H., van Raak, M., Inoue, I., & Tomikawa, A. (1992b). Limitations in the exploitation of N-phenylcarbamates and N-phenylformamidoximes to control benzimidazole-resistant Venturia nashicola on Japanese pear. Plant Pathology, 41, 543–553.
Ishii, H., & Yanase, H. (2000). Venturia nashicola, the scab fungus of Japanese and Chinese pears: A species distinct from V. pirina. Mycological Research, 104, 755–759.
Ishii, H., Watanabe, H., & Tanabe, K. (2002). Venturia nashicola: Pathological specialization on pears and control trial with resistance inducers. Acta Horticulturae, (587), 613–621.
Koh, H. S., Sohn, S. H., Lee, Y. S., Koh, Y. J., Song, J. H., & Jung, J. S. (2013). Specific and sensitive detection of Venturia nashicola, the scab fungus of Asian pears, by nested PCR. The Plant Pathology Journal, 29, 357–363.
Kozaki, I. (1973). Black spot disease resistance in Japanese pear. I Heredity of the disease resistance. Bulletin of the Horticultural Research Station (Ministry of Agriculture & Forestry) Series A (Hiratsuka), 12, 17–27 (in Japanese with English summary).
Le Cam, B., Devaux, M., & Parisi, L. (2001). Specific polymerase chain reaction identification of Venturia inaequalis using internally transcribed spacer region in the ribosomal DNA. Phytopathology, 91, 900–904.
Nishimura, S., & Kohmoto, K. (1983). Host-specific toxins and chemical structures from Alternaria species. Annual Review of Phytopathology, 21, 87–116.
Otani, H. (2000). Host recognition by plant pathogens and role of host-specific toxins. Journal of General Plant Pathology, 66, 278–280.
Parisi, L., Lespinasse, Y., Guillaumes, J., & Krüger, J. (1993). A new race of Venturia inaequalis virulent to apples with resistance due to the gene Vf. Phytopathology, 83, 533–537.
Pierantoni, L., Dondini, L., Cho, K. H., Shin, I.-S., Gennari, F., Chiodini, R., et al. (2007). Pear scab resistance QTLs via a European pear (Pyrus communis) linkage map. Tree Genetics & Genomes, 3, 311–317.
Saito, T. (2016). Advances in Japanese pear breeding in Japan. Breeding Science, 66, 46–59.
Tashiro, N., Manabe, K., & Ide, Y. (2012). Emergence and frequency of highly benzimidazole-resistant Colletotrichum gloeosporioides, pathogen of Japanese pear anthracnose, after discontinued use of benzimidazole. Journal of General Plant Pathology, 78, 221–226.
Tsuge, T., Harimoto, Y., Hanada, K., Akagi, Y., Kodama, M., Akimitsu, K., et al. (2016). Evolution of pathogenicity controlled by small, dispensable chromosomes in Alternaria alternata pathogens. Physiological and Molecular Plant Pathology, 95, 27–31.
Weir, B. S., Johnston, P. R., & Damm, U. (2012). The Colletotrichum gloeosporioides species complex. Studies in Mycology, 73, 115–180.
Zhang, H. E., Yue, W. Q., Wu, Y. Q., Yi, W., Han, Z. H., & Zhang, X. Z. (2012). Selection and evaluation of interspecific hybrids of pear highly resistant to Venturia nashicola. Journal of Phytopathology, 160, 346–352.
Zhang, P. F., Zhai, L. F., Zhang, X. K., Huang, X. Z., Hong, N., Xu, W. X., et al. (2015). Characterization of Colletotrichum fructicola, a new causal agent of leaf black spot disease of sandy pear (Pyrus pyrifolia). European Journal of Plant Pathology, 143, 651–662.
Acknowledgments
The authors are grateful to Yoshihiko Sato and his colleagues at NARO, National Institute of Fruit Tree Science, Tsukuba, Japan for kindly preparing grafted young trees of cv. Yutaka and for confirming parental cultivars of cv. Yutaka using SSR molecular markers. We also thank Derek W Hollomon, Orchard House, Bristol, UK, for his critical reading of the manuscript of this paper.
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Ishii, H., Kimura, Y. A new interspecific pear cultivar Yutaka: highly resistant to the two major diseases scab and black spot on Asian pears. Eur J Plant Pathol 152, 507–514 (2018). https://doi.org/10.1007/s10658-018-1457-0
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DOI: https://doi.org/10.1007/s10658-018-1457-0