Caracterização e ocorrência de agentes causais de oídio em cucurbitáceas no Brasil e reação de germoplasma de meloeiro

Fazza, Ana Carolina

doi:10.11606/d.11.2006.tde-16082006-160640

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…In Brazil, race 1 has been identified by several authors (Reifschneider et al, 1985;Reis et al, 2002;Reis et al, 2005). Race 2 was first observed in São Paulo in 2000 (Kobori et al, 2004) and then in the Federal District (Reis & Buso, 2004), Petrolina (Kobori et al, 2005) and in the Mossoró-Assu Agricultural Pole (Fazza, 2006). Fazza (2006) also reported the occurrence of races 0, 3, 4 and 5 at a lower frequency compared to races 1 and 2.…”

Section: T He Melon (Cucumis Melo L)mentioning

confidence: 99%

“…U. Braun & Shish, is the main fungus problem that affects the melon canopy. This disease occurs mainly in periods of low relative air humidity and high temperatures (Fazza, 2006).…”

Section: T He Melon (Cucumis Melo L)mentioning

confidence: 99%

“…The second fact is the small number of isolates used in the two environments to monitor the race frequency, only seven in each location. Indeed, it can be questioned whether the small sample allowed the identification of the most prevalent races (1 and 2) but the less frequent races could not be identified, a fact observed by Fazza (2006) because of the greater number of isolates collected, 65 in total. Family x location interaction was not observed, as can be observed by the nil estimates of the component of variance of the interaction (Table 1).…”

Section: Localmentioning

confidence: 99%

“…Fazza (2006) assessed the reaction of commercial melon hybrids cultivated in Brazil to race 2 and observed that most were resistant.…”

Section: Localmentioning

confidence: 99%

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Reaction of families and lines of melon to powdery mildew

et al. 2011

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Powdery mildew, caused by Podosphaera xanthii, is an important disease of melon in the Brazilian Northeast. The objective of this work was to evaluate the reaction of families, lines and cultivars of melon to P. xanthii. Two experiments in simple lattice were carried out under field conditions in the municipalities of Mossoró and Baraúna to evaluate 144 families. In a greenhouse, an experiment was carried out in a completely randomized design to evaluate 19 lines and the cultivars Yellow Queen, Chilton and Hy Mark. Disease was assessed by a severity scale. There was genetic variability among families. The families 4, 5, 11, 14, 18, 23, 33, 42, 101, 112 and 140 were identified in both sites as resistant. The lines LOF-027, LOF-105, LPS-124, MEL-008 and cultivar Chilton showed resistance to race 1 of the fungus.

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Section: T He Melon (Cucumis Melo L)mentioning

confidence: 99%

“…U. Braun & Shish, is the main fungus problem that affects the melon canopy. This disease occurs mainly in periods of low relative air humidity and high temperatures (Fazza, 2006).…”

Section: T He Melon (Cucumis Melo L)mentioning

confidence: 99%

Section: Localmentioning

confidence: 99%

“…Fazza (2006) assessed the reaction of commercial melon hybrids cultivated in Brazil to race 2 and observed that most were resistant.…”

Section: Localmentioning

confidence: 99%

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Reaction of families and lines of melon to powdery mildew

et al. 2011

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“…() also reported the presence of the race 3.5. In Brazil, the races of P. xanthii found on melon crops were 0, 1, 2F, 3, 4 and 5, with prevalence of races 1 and 2F (Reis & Buso, ; Fazza, ). In more recent trials conducted in northeastern Brazil, the races 1, 2F, 3, 3.5 and 5 have been identified (unpublished data).…”

Section: Introductionmentioning

confidence: 99%

Brazilian melon landraces resistant to Podosphaera xanthii are unique germplasm resources

Nunes

Esteras

Ricarte

et al. 2017

Annals of Applied Biology

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Podosphaera xanthii is the most important causal agent of powdery mildew in melon, a crop ranked within the most economically important species worldwide. The best strategy to face this fungus disease, which causes important production losses, is the development of genetically resistant cultivars. Genetic breeding programmes require sources of resistance, and a few ones have been reported in melon, mostly in Momordica and Acidulus horticultural groups. However, the existence of many races that reduces the durability of the resistance makes necessary to find new resistant genotypes with different genetic backgrounds. In this work, Brazilian germplasm, together with a set of Indian landraces, and the COMAV's (Institute for the Conservation and Breeding of Agricultural Biodiversity) melon core collection, representing the whole variability of the species, were assessed for resistance against some common races in Spain and Brazil and genotyped with a 123-SNP (single nucleotide polymorphisms) genotyping platform to study the molecular relationships of the resistant accessions. In the first experiment, carried out in Valencia (Spain) in 2013, seventy-nine melon accessions were evaluated using artificial inoculation. Five accessions selected as resistant were also evaluated against races 1, 3, and 5 in Mossoró (Brazil, 2015) and against race 3.5 in Valencia (2016) under greenhouse conditions, and under four field conditions in Brazil. The accessions, AL-1, BA-3, CE-3, and RN-2, within the Brazilian collection, presented resistance against all the races of P. xanthii assayed in all conditions tested. AL-1, CE-3 and RN-2 were molecularly more similar to wild agrestis and Acidulus melons from Asia and Africa, while BA-3 grouped with Momordica types. Molecular analysis also confirmed that these new Brazilian sources of resistance differ from those previously reported, constituting interesting materials to encourage genetic breeding programmes, especially in Brazil and Spain.

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Identificação de marcador molecular ligado ao gene >i<Pm-1>/i< que confere resistência a raça 1 de oídio (>i<Podosphaera xanthii>/i<) em melão (>i<Cucumis melo>/i< L.)

Silva-Barreto¹

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e às minhas sobrinhas Camila, Caroline e Ana Beatriz pelo apoio mesmo distante, amor e carinho sempre, DEDICO. "... A opinião é uma crença que tem consciência de ser insuficiente tanto subjetiva quanto objetivamente. Se a crença é apenas subjetivamente suficiente e se é ao mesmo tempo considerada objetivamente insuficiente, chama-se fé. Enfim, a crença suficiente tanto subjetiva quanto objetivamente chama-se ciência". Emmanuel Kant Ao Douglas, pela paciência, companheirismo, dedicação e amor, OFEREÇO. 4 AGRADECIMENTOS Ao orientador Prof. Dr. Luis Eduardo Aranha Camargo, pela confiança, orientação, apoio e dedicação.Ao professor Hiroshi Kimati pelos ensinamentos, dedicação, serenidade e principalmente a alegria que sempre contagiou a todos. Aos grandes amigos do LGM:A todos os professores pelo auxílio durante minha formação acadêmica.Aos alunos do curso de pós-graduação pelos momentos passados juntos em aulas e outros eventos em especial Alessandra, Maria Cândida, Vanessa e Marisa.À Amanda pelas conversas que foram essenciais nesta fase de minha vida e também ao Enzo por me ouvir.A todos que colaboraram direta e indiretamente neste trabalho. À Fundação de Amparo e Pesquisa do Estado de São Paulo (FAPESP), pelo auxílio financeiro concedido pra realização deste trabalho. ABSTRACTIdentification of molecular marker linked to the Pm-1 gene that confers resistance to race 1 of to powdery mildew (Podosphaera xanthii) in melon (Cucumis melo L.)Melon crop is of great economical importance in Brazil being the Northeast region the main producer and exporter of the fruit. The low levels of resistance to pathogens is one of the restricting factors for the Brazilian competitiveness worldwide. One of the most important diseases is powdery mildew caused by Podosphaera xanthii. Generally, the control of P. xanthii is achieved with the use of fungicides. However it is necessary to use less expensive control methods with a minimum environmental impact such as resistant cultivars. The objective of this work was to identify molecular markers linked to the Pm-1 gene which confers resistance to race 1 of P. xanthii with the purpose of assisting boding program. Two near isogenic lines (LQIs) of melon Agro AF426 pm1 (P1) and AF426 Pm1 (P2), both belonging to the inodorus variety, which are respectivally contrasting for abscence and presence of Pm-1 gene were analyzed. For the cosegregation analyses between gene and candidate markers, it was used the BC1F1 population was used screened for resistance to powdery mildew and obtained from a cross between the LQIs. The LM-PCR and AFLP techniques were efficient in the polymorphisms detection, however only those ones which were found using AFLP technique could be used as markers in the co-segregation test. It was found two markers with this technique but just the HF155 is located 4.9 cM of the Pm-1 gene. Due the proximity of the HF155 marker to the Pm-1 gene this one can be used in markerassisted selection aiming to develop melon cultivars resistant to P. xanthii.

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Caracterização e ocorrência de agentes causais de oídio em cucurbitáceas no Brasil e reação de germoplasma de meloeiro

Cited by 3 publications

References 11 publications

Reaction of families and lines of melon to powdery mildew

Reaction of families and lines of melon to powdery mildew

Brazilian melon landraces resistant to Podosphaera xanthii are unique germplasm resources

Identificação de marcador molecular ligado ao gene >i<Pm-1>/i< que confere resistência a raça 1 de oídio (>i<Podosphaera xanthii>/i<) em melão (>i<Cucumis melo>/i< L.)

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