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Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa

In N. Ireland Diaporthe perniciosa March is a common inhabitant of the dead wood of Bramley's Seedling apple trees, and its pycnospores, extruded throughout the growing season, are responsible for fruit infections which result in stalk‐end rots during storage. Pycnidia were produced in culture...

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Main Authors: Ayub, A. Nawawi Hoji, Swinburne, Terence R.
Format: Article
Published: Wiley 1970
Subjects:
Q Science (General)
QH Natural history
Online Access:http://eprints.um.edu.my/24550/
https://doi.org/10.1111/j.1744-7348.1970.tb06431.x
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spelling my.um.eprints.245502021-03-22T04:01:41Z http://eprints.um.edu.my/24550/ Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa Ayub, A. Nawawi Hoji Swinburne, Terence R. Q Science (General) QH Natural history In N. Ireland Diaporthe perniciosa March is a common inhabitant of the dead wood of Bramley's Seedling apple trees, and its pycnospores, extruded throughout the growing season, are responsible for fruit infections which result in stalk‐end rots during storage. Pycnidia were produced in culture only after exposure to light, near‐UV radiation being particularly favourable. The carbon source in the medium influenced pycnidia production: high yields were obtained where mannitol was used. Only a‐spores germinated under the conditions tested, giving optimum germination at 25 d̀C. in a water film. No germination occurred at less than 98% R.H. Germ tubes and hyphae developed appressoria after germination on artificial surfaces but on apple skin most spores produced only a protuberance from which penetration hyphae developed directly. The cuticle and epidermal cells of apples of all ages were penetrated within a few days of inoculation. Intact surfaces and lenticels were penetrated equally. Susceptibility to further rotting increased with age of the fruit. Apples loaded with spores early in the season rotted later than similar apples loaded just before picking. Polygalacturonase was detected in sap expressed from rotted apples of various ages, the level of activity being correlated with the susceptibility of the fruit. Copyright © 1970, Wiley Blackwell. All rights reserved Wiley 1970 Article PeerReviewed Ayub, A. Nawawi Hoji and Swinburne, Terence R. (1970) Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa. Annals of Applied Biology, 66 (2). pp. 245-255. ISSN 0003-4746 https://doi.org/10.1111/j.1744-7348.1970.tb06431.x doi:10.1111/j.1744-7348.1970.tb06431.x
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
QH Natural history
spellingShingle Q Science (General)
QH Natural history
Ayub, A. Nawawi Hoji
Swinburne, Terence R.
Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
description In N. Ireland Diaporthe perniciosa March is a common inhabitant of the dead wood of Bramley's Seedling apple trees, and its pycnospores, extruded throughout the growing season, are responsible for fruit infections which result in stalk‐end rots during storage. Pycnidia were produced in culture only after exposure to light, near‐UV radiation being particularly favourable. The carbon source in the medium influenced pycnidia production: high yields were obtained where mannitol was used. Only a‐spores germinated under the conditions tested, giving optimum germination at 25 d̀C. in a water film. No germination occurred at less than 98% R.H. Germ tubes and hyphae developed appressoria after germination on artificial surfaces but on apple skin most spores produced only a protuberance from which penetration hyphae developed directly. The cuticle and epidermal cells of apples of all ages were penetrated within a few days of inoculation. Intact surfaces and lenticels were penetrated equally. Susceptibility to further rotting increased with age of the fruit. Apples loaded with spores early in the season rotted later than similar apples loaded just before picking. Polygalacturonase was detected in sap expressed from rotted apples of various ages, the level of activity being correlated with the susceptibility of the fruit. Copyright © 1970, Wiley Blackwell. All rights reserved
format Article
author Ayub, A. Nawawi Hoji
Swinburne, Terence R.
author_facet Ayub, A. Nawawi Hoji
Swinburne, Terence R.
author_sort Ayub, A. Nawawi Hoji
title Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
title_short Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
title_full Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
title_fullStr Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
title_full_unstemmed Observations on the infection and rotting of apples var. Bramley's Seedliong by Diaporthe perniciosa
title_sort observations on the infection and rotting of apples var. bramley's seedliong by diaporthe perniciosa
publisher Wiley
publishDate 1970
url http://eprints.um.edu.my/24550/
https://doi.org/10.1111/j.1744-7348.1970.tb06431.x
_version_ 1695531090279661568
score 13.211869

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