Floral biological investigations of apple cultivars in relation to fire blight

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dc.creatorOrosz-Kovács, Zs.
dc.creatorFarkas, A.
dc.creatorBubán, T.
dc.creatorBukovics, P.
dc.creatorNagy Tóth, E.
dc.creatorDéri, H.
dc.date2004-05-10
dc.date.accessioned2021-06-28T09:58:52Z
dc.date.available2021-06-28T09:58:52Z
dc.descriptionFloral activity was studied in two apple cultivars: an Erwinia-tolerant (Treedorn') and a sensitive one (`Sampion'). Since more types of protogyny occur in apples, the period of stigma activity is different. Papillae of the exposed stigma in flowers of 'Freedom' function longer (usually more than a week) than in the delayed homogamous `Sampion'. Despite of this, cv. 'Freedom' is tolerant to Erwinia amylovora (Burr.) Winslow et al., suggesting no relationship between the floral biological type (including the exposure and longevity of stigma) and the infection by E. amylovora. According to SEM micrographs, nectary stomata in `Freedom' are already open in the flower bud, where nectar secretion starts and continues until the senescence of the stigma. However, the long period of nectar secretion does not create optimal conditions for bacterial growth, since nectar production is scant in the flowers of 'Freedom'. The surface of the nectary, its nectar-retaining capacity, and the amount and concentration of nectar may influence the susceptibility of apple cultivars. It is manifested well by the smooth nectary surface with nectary stomata rising slightly above the epidermis in flowers of cv. 'Freedom', contrasting the wrinkled, striate nectary surface with slightly sunken stomata in the flowers of 'Sampion'.
dc.formatapplication/pdf
dc.identifierhttps://ojs.lib.unideb.hu/IJHS/article/view/454
dc.identifier10.31421/IJHS/10/2/454
dc.identifier.urihttp://hdl.handle.net/2437/314243
dc.languageeng
dc.publisherUniversity of Debrecen
dc.relationhttps://ojs.lib.unideb.hu/IJHS/article/view/454/453
dc.rightsCopyright (c) 2018 International Journal of Horticultural Science
dc.sourceInternational Journal of Horticultural Science; Vol. 10 No. 2 (2004); 9-14.
dc.source2676-931X
dc.source1585-0404
dc.source10.31421/IJHS/10/2
dc.subjectapple
dc.subjectErwinia amylovora
dc.subjectfloral biology
dc.subjectnectary
dc.subjectnectar
dc.subjectnectary stomata
dc.subjectstigma
dc.titleFloral biological investigations of apple cultivars in relation to fire blight
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
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International Journal of Horticultural Science