STUDIES ON THE CAUSES OF FLORAL BUD ABORTION OF JAPANESE PEAR (PYRUS PYRIFOLIA) IN SOUTHERN BRAZIL

2002 ◽  
pp. 375-380 ◽  
Author(s):  
J.L. Petri ◽  
G.B. Leite ◽  
Y. Yasunobu
Keyword(s):  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Southern Brazil ◽  
Floral Bud

scholarly journals (280) Temporal and Spatial Expression of LEAFY and TERMINAL FLOWER 1 Homologues in Floral Bud of Japanese Pear and Quince

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1052B-1052 ◽  
Author(s):  
Tomoya Esumi ◽  
Ryutaro Tao ◽  
Keizo Yonemori
Keyword(s):  
Apical Meristem ◽  
Floral Meristem ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Rt Pcr ◽  
Inflorescence Development ◽  
Terminal Flower ◽  
Terminal Flower 1 ◽  
Floral Differentiation ◽  
Floral Bud

Japanese pear (Pyrus pyrifolia) and quince (Cydonia oblonga), both classified in the subfamily Maloideae, show differences in inflorescence architectures despite of the fact that they are genetically closely related. We previously isolated flowering related genes, LEAFY (LFY) and TERMINAL FLOWER 1 (TFL1) homologues, from these species and showed that they had two types of homologues for each gene. In this study, we examined the expression pattern of LFY and TFL1 homologues in these species by in situ hybridization and RT-PCR. The floral bud was dissected to small pieces under stereomicroscope; apical meristem, scales/bracts, pith, floral meristem, and inflorescence; and then used for RT-PCR. The LFY homologues were expressed in apical meristem and scales/bracts before the floral differentiation in both Japanese pear and quince. After floral differentiation, the expression was observed in floral meristem, scales/bracts and pith in both the species. The TFL1 homologues were strongly expressed in the apical meristem, but their expression was drastically decreased just before floral differentiation. It is considered that the decrease of expression of TFL1 homologues is a sign of floral initiation. The expression of TFL1 homologues was transiently increased at the beginning of floral differentiation in both species. Moreover, one of TFL1 homologues in Japanese pear was continuously expressed in the inflorescence part in the floral primordia, whereas expression of TFL1 homologues in quince almost completely disappeared after a solitary floral meristem was initiated. It was suggested that TFL1 homologues may also be involved in the inflorescence development of Japanese pear.

scholarly journals ‘SCS421 CAROLINA’, FIRST JAPANESE PEAR CULTIVAR DEVELOPED IN BRAZIL

2017 ◽  
Vol 39 (spe) ◽  
Author(s):  
IVAN DAGOBERTO FAORO
Keyword(s):  
Cold Storage ◽  
Japanese Pear ◽  
Pyrus Pyrifolia ◽  
Southern Brazil ◽  
Pear Cultivar ◽  
Preliminary Results ◽  
Experimental Station ◽  
Asian Pear ◽  
Fruit Skin

ABSTRACT The new SCS421 Carolina cultivar, belonging to the Pyrus pyrifolia var. culta species, is classified as an Asian pear type or more specifically Japanese pear type. It was obtained from the Kousui x Osanijisseiki crossing made at Epagri / Caçador Experimental Station. Its flowering occurs from the second half of September to mid-October, similarly to Housui cultivar. According to preliminary results, ‘Yali’ and ‘Housui’ may be used as pollinators. The harvest takes place in the first half of February and production is above 20 t / ha. Plants produce more rounded and symmetrical fruits compared to Housui cultivar. The fruit skin is golden, the pulp is crispy, soft, sweet, very juicy and slightly aromatic. Fruits can be stored for up to four months in conventional cold storage. The incidence of scabies and dry branch diseases in the field has not been recorded. It is recommended for cultivation at colder regions of southern Brazil.

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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