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Previous issue date: 2013 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O Ceratocystis fimbriata Ellis & Halsted ? um fitopat?geno vascular de ampla distribui??o geogr?fica e gama de hospedeiros. A murcha de Ceratocystis em Eucalyptus ? considerada de dif?cil controle devido ao seu car?ter sist?mico e a variabilidade gen?tica dos isolados. O plantio de material resistente ? a principal forma de controle desta doen?a. No entanto, a obten??o de material gen?tico resistente pode demandar longos per?odos em um programa de melhoramento. A identifica??o de gen?tipos resistentes dentre os clones utilizados comercialmente pode ajudar a abreviar o tempo necess?rio ao melhoramento. Assim, objetivou-se avaliar a resist?ncia de clones de eucalipto ? murcha de Ceratocystis, analisar as respostas ecofisiol?gicas desses clones sob infec??o e fornecer suporte ao processo de melhoramento gen?tico para tal caracter?stica. Foram avaliados 27 clones de resist?ncia desconhecida e 2 clones caracterizados como resistente e suscet?vel ? murcha de Ceratocystis, todos inoculados artificialmente com isolados de C. fimbriata. Os 27 clones apresentaram, aos 50 dias ap?s inocula??o, varia??o quanto ? resist?ncia ? doen?a. Os dois clones de resist?ncia conhecida tiveram crescimento, ?ndice de clorofila e efici?ncia qu?ntica do fotossistema II (Fv/Fm) avaliados em quatro diferentes tempos. As vari?veis analisadas apresentaram potencial para uso na avalia??o da resist?ncia/suscetibilidade de gen?tipos de Eucalyptus spp. ? murcha de Ceratocystis. O clone resistente (R) e o suscet?vel (S) foram utilizados para a constru??o de uma biblioteca subtrativa supressiva. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. / ABSTRACT
The Ceratocystis fimbriata Ellis & Halsted is a vascular phytopathogen of wide geographic distribution and host range. Ceratocystis wilt in Eucalyptus is considered difficult to control due to its systemic character and the genetic variability of the isolated. Planting resistant material is the main way to control this disease. However, the acquisition of genetic material resistant may require long periods in a breeding program. The identification of resistant genotypes among clones used commercially can help shorten the time needed to improve. The aim was to evaluate the resistance of eucalyptus clones to Ceratocystis wilt, analyze the ecophysiological responses of these clones under infection and provide support to the process of breeding for this trait. We evaluated 27 clones of unknown resistance and 2 clones characterized as resistant and susceptible to Ceratocystis wilt, all artificially inoculated with isolates of C. fimbriata. The 27 clones showed, 50 days after inoculation, variation in disease resistance. The two clones of known resistance grew, chlorophyll content and quantum efficiency of photosystem II (Fv / Fm) evaluated at four different times. The variables analyzed showed potential for use in the evaluation of the resistance/susceptibility of genotypes of Eucalyptus spp. to Ceratocystis wilt. The clone resistant (R) and susceptible (S) were used for the construction of a suppressive subtractive library.
| Identifer | oai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/341 |
| Date | 08 August 2013 |
| Creators | Marques, Ariadne |
| Contributors | Zauza, Edival ?ngelo Valverde, Oliveira, M?rcio Leles Romarco de, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Laia, Marcelo Luis de |
| Publisher | UFVJM |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM |
| Rights | A concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess |
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