Taxa de fecundação cruzada no cultivar de mandioca branca de santa catarina

Pereira, A. S.; Lorenzi, José Osmar; Normanha, E. S.; Silva, J. R. da

doi:10.1590/s0006-87051978000100033

Cited by 5 publications

(2 citation statements)

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“…Sexual traits of cassava, such as strong protogyny (individuals are monoecious), insect pollination, and the existence of inbreeding depression (Kawano et al 1978) are also consistent with an outcrossed mating system. Assessment of cassava breeding system using morphological markers (Pereira 1978) also supports the view that cassava is allogamous. However, in light of large differences among varieties in fertility and in frequency in the fields, it is highly improbable that all varieties equally participated in sexual reproduction.…”

Section: Discussionmentioning

confidence: 99%

Unmanaged sexual reproduction and the dynamics of genetic diversity of a vegetatively propagated crop plant, cassava (Manihot esculenta Crantz), in a traditional farming system

et al. 2001

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Occurrence of intervarietal or interspecific natural crosses has been reported for many crop plants in traditional farming systems, underlining the potential importance of this source of genetic exchange for the dynamics of genetic diversity of crop plants. In this study, we use microsatellite loci to investigate the role of volunteer seedlings (plants originating from unmanaged sexual reproduction) in the dynamics of genetic diversity of cassava (Manihot esculenta Crantz), a vegetatively propagated crop, in a traditional farming system in Guyana. A previous field study showed that farmers incorporate such plants into the germplasm for vegetative propagation, and that many of them are likely to be assigned by farmers to recognized varieties. Under strict vegetative propagation clonality of varieties is expected. The high proportion of polyclonal varieties observed suggests that incorporation of seedlings into the germplasm for propagation is a frequent event. The molecular variability assessed with microsatellite markers shows that there is high differentiation among heterozygous varieties, whereas populations of seedlings do not depart from the proportions expected under Hardy-Weinberg assumptions. Assignment of seedlings to a recognized variety on the basis of morphological similarity greatly increases genetic diversity within the variety. We argue that recombination and gene flow play a major role in the dynamics of genetic diversity of cassava in traditional farming systems. Documenting unmanaged sexual reproduction and its genetic consequences is a prerequisite for defining strategies of in situ conservation of crop plant genetic resources.

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Section: Discussionmentioning

confidence: 99%

Unmanaged sexual reproduction and the dynamics of genetic diversity of a vegetatively propagated crop plant, cassava (Manihot esculenta Crantz), in a traditional farming system

et al. 2001

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“…O cruzamento em mandioca (Manihot esculenta CRANTZ) processa-se naturalmente ou com o auxí-lio do homem, sem grande dificuldades, sendo regra geral a ocorrên-cia de fecundação cruzada, pelo fato de as flores femininas abrirem bem antes das masculinas (PEREI-RA et alii 7). O cruzamento entre clones de Manihot esculenta ou mesmo entre espécies desse gênero tem sido feito em várias regiões da terra onde se conduzem pesquisas relacionadas com o melhoramento genético da mandioca (PAVAN & CUNHA, 5, e CONCEIÇÃO, 1).…”

Section: Introductionunclassified

Novos clones de mandioca obtidos por cruzamento entre cultivares

Schmidt

Pereira

1980

Bragantia

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(') Recebido para publicação a 27 de dezembro de 1979. RESUMOAnalisou-se o comportamento de alguns cruzamentos entre os cultivares Mantiqueira e Cafelha de Manihoí esculenta CRANTZ.Fez-se o plantio de linhas alternadas desses clones para obtenção dos cruzamentos. Foram realizadas durante quatro anos observações sobre o comportamento dos cruzamentos obtidos e, no grupo citado no quadro 1, destacaram-se os de números 17 e 50 com relação ao stand final, produtividade e resistência as moléstias. A comparação desses clones foi sempre feita com o 'Mantiqueira', considerado como o tratamento testemunha. Foram tão produtivos quanto o 'Mantiqueira', possuindo, no entanto, película clara, feloderma e polpa brancos, o que constitui grande vantagem do ponto de vista industrial.

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Breeding Bananas and Plantains

Rowe¹

1984

Plant Breeding Reviews

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Taxa de fecundação cruzada no cultivar de mandioca branca de santa catarina

Cited by 5 publications

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Unmanaged sexual reproduction and the dynamics of genetic diversity of a vegetatively propagated crop plant, cassava (Manihot esculenta Crantz), in a traditional farming system

Unmanaged sexual reproduction and the dynamics of genetic diversity of a vegetatively propagated crop plant, cassava (Manihot esculenta Crantz), in a traditional farming system

Novos clones de mandioca obtidos por cruzamento entre cultivares

Breeding Bananas and Plantains

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