scholarly journals “Floral Primordia Necrosis” Incidence in Mixed Buds of Japanese Pear (Pyrus pyrifolia (Burm.) Nakai var. culta) ‘Housui’ Grown under Mild Winter Conditions and the Possible Relation with Water Dynamics

2010 ◽  
Vol 79 (3) ◽  
pp. 246-257 ◽  
Author(s):  
Robson Ryu Yamamoto ◽  
Akemi Katsumi-Horigane ◽  
Mitsuru Yoshida ◽  
Yoshihiko Sekozawa ◽  
Sumiko Sugaya ◽  
...  
Keyword(s):  
Water Dynamics ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Mild Winter ◽  
Winter Conditions ◽  
Floral Primordia

scholarly journals Cloning of the S8-RNase (S8-allele) of Japanese Pear (Pyrus pyrifolia Nakai).

2002 ◽  
Vol 19 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Carlos CASTILLO ◽  
Takeshi TAKASAKI ◽  
Toshihiro SAITO ◽  
Shigemi NORIOKA ◽  
Tetsu NAKANISHI
Keyword(s):  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Pyrus Pyrifolia Nakai

Botryosphaeria berengeriana f.sp. piricola. [Distribution map].

1996 ◽  
Author(s):  
Keyword(s):  
Geographical Distribution ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Malus Pumila ◽  
Distribution Map ◽  
European Pear ◽  
New Distribution

Abstract A new distribution map is provided for Botryosphaeria berengeriana f.sp. piricola (Nose) Koganezawa & Sakuma. Hosts: Japanese pear (Pyrus pyrifolia), also European pear (P. communis) and apple (Malus pumila). Information is given on the geographical distribution in China, Anhui, Fujian, Guangxi, Hebei, Henan, Hubei, Jiangsu, Jiangxi, Jilin, Liaoning, Shandong, Shanxi, Sichuan, Zhejiang, Japan, Honshu, Shikoku, Korea Dem. People's Republic, Korea Republic, Taiwan.

Pathogenic Specialization of Venturia nashicola, Causal Agent of Asian Pear Scab, and Resistance of Pear Cultivars Kinchaku and Xiangli

2020 ◽  
Author(s):  
Hideo Ishii ◽  
Kumiko Nishimura ◽  
Kenji Tanabe ◽  
Yuichi Yamaoka
Keyword(s):  
Resistance Breeding ◽  
Scab Resistance ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Asian Pear ◽  
Sexual Recombination ◽  
Venturia Nashicola ◽  
Race 1 ◽  
New Races ◽  
Race 2

Scab, caused by Venturia nashicola is one of the most serious diseases of Asian pears including Japanese pear (Pyrus pyrifolia var. culta) and Chinese pears (P. bretschneideri and P. ussuriensis). Breeding of scab-resistant pear cultivars is essential to minimize the use of fungicides and the risk of fungicide resistance developing in the pathogen. A survey of pathogenic specialization in V. nashicola is needed to ensure durable scab resistance in cultivated pears. Race 1, 2, and 3 isolates of V. nashicola, each differing in pathogenicity to Japanese pear cv. Kousui and Asian pear strain Mamenashi 12, have been reported from Japan. In the present study, isolates collected from scabbed pears in China and Taiwan were classified as V. nashicola based on conidial size and mating ability. However, various isolates were found to have pathogenicity distinct from races 1, 2, and 3 in tests on seven differential host genotypes: Kousui; Mamenashi 12; Chinese pear cvs. Jingbaili, Yali, Linyuli, Nanguoli; and Taiwanese pear cv. Hengshanli. The new races were designated as races 4 to 7. Progenies characteristic of race 3 isolates were produced in a cross between race 1 and race 2 isolates, suggesting the possible role of sexual recombination in the emergence of novel races. Japanese pear cv. Kinchaku and cv. Xiangli of P. sinkiangensis (Korla fragrant pear grown in China) didn’t show visible symptoms after inoculation with any of the seven races. The broad scab resistance in Kinchaku and Xiangli makes them a promising genetic resource for resistance breeding programs.

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