国立研究開発法人 国際農林水産業研究センター | JIRCAS

Gamma-Ray-Induced Mutation Breeding in Fruit Trees : Breeding of Mutant Cultivars Resistant to Black Spot Disease in Japanese Pear

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

Black spot disease, caused by Alternaria alternata Japanese pear pathotype, is the most important and serious disease of the susceptible cultivars of Japanese pear. The fungus produces a host-specific toxin (AK-toxin) which is highly toxic to the susceptible cultivars. Susceptibility to this disease is controlled by a single dominant gene, and all the susceptible cultivars are heterozygous. Mutants resistant to black spot disease were induced by irradiation of susceptible cultivars with gamma-rays. Nine resistant mutants were selected from chronically irradiated ‘Nijisseiki’. One of these mutants was registered as ‘Gold Nijisseiki’. A resistant mutant derived from acutely irradiated dormant scions of ‘Shinsui’ was registered as ‘Kotobuki Shinsui’. One resistant mutant, which was induced from acutely irradiated dormant scions of ‘Osanijisseiki’, displayed unfavorable characteristics. Four resistant mutants were selected from chronically irradiated ‘Osanijisseiki’. One of them was registered as ‘Osa Gold’. A list of these resistant mutants is shown in Table 4. It was confirmed that all of the mutants showed an intermediate resistance to black spot disease and conferred various levels of resistance. Moreover, mutations with a higher level of resistance than that of ‘Gold Nijisseiki’ were induced from ‘Gold Nijisseiki’ by acute and chronic gamma-ray irradiation. The reason why various levels of resistance were induced could not be elucidated.

刊行年月1999-10-01
作成者Toji YOSHIOKA Tetsuo MASUDA Kazuo KOTOBUKI Tetsuro SANADA Yuji ITO
データ作成日1999-10-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
33
4
開始ページ227
終了ページ234
言語eng