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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Processo infeccioso de Ramularia areola em algodoeiro / Infectious process of Ramularia areola on cotton

Curvêlo, Carmen Rosa da Silva 17 February 2009 (has links)
Made available in DSpace on 2015-03-26T13:39:29Z (GMT). No. of bitstreams: 1 texto completo.pdf: 355166 bytes, checksum: fca33886e7049d30889ecd53a351d550 (MD5) Previous issue date: 2009-02-17 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / The infectious process of Ramularia areola, the causal agent of ramularia leaf spot, on leaves of cotton, Gossypium hirsutum L. (Malvaceae), was studied by using the scanning electron microscope. Conidia started to germinate at 12 hours after inoculation (hai) and no appressoria were observed at this time. In most cases, conidia germinated and produced two germ tubes that grew towards the stomata where the penetration occurred. Fungus sporulation occurred at both adaxial and abaxial leaf epidermis through the stomata. Fungal hyphae suscefully colonized the mesophyll cells both inter and intra cellularly. Disease symptoms appeared at 12 dai with severity level of 1%, but reached 32% at 22 dai. / O processo infeccioso de Ramularia areola, o agente causal da mancha da ramulária, em folhas de algodoeiro, Gossypium hirsutum L. (Malvaceae), foi estudado utilizando a microscopia eletrônica de varredura. Os conídios iniciaram a germinação 12 horas após a inoculação (hai) e nenhum apressório foi observado nesse período. Na maioria dos casos, os conídios germinaram e produziram dois tubos germinativos que cresceram através dos estômatos onde a penetração ocorreu. A esporulação do fungo ocorreu em ambas as faces adaxial e abaxial da epiderme foliar através dos estômatos. As hifas do fungo colonizaram com sucesso as células do mesófilo inter e intra celularmente. Os sintomas da doença apareceram em 12 dai com um nível de severidade de 1%, porém alcançaram 32% em 22 dai.

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