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Genética de Coffea. XIX - Mutação somática afetando a côr das fôlhas em café

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dc.contributor.author Antunes Filho, H.
dc.contributor.author Carvalho, Alcides
dc.date.accessioned 2019-01-15T16:31:52Z
dc.date.available 2019-01-15T16:31:52Z
dc.date.issued 1954-05
dc.identifier.citation ANTUNES FILHO, H.; CARVALHO, A. Genética de Coffea. XIX - Mutação somática afetando a côr das fôlhas em café. Bragantia, Campinas, v. 13, n. 4, p. 11-12, 1954. pt_BR
dc.identifier.issn 1678-4499
dc.identifier.uri http://dx.doi.org/10.1590/S0006-87051954000100029 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/10984
dc.description.abstract Somatic mutations usually found in Coffea arabica L. result in most cases from doubling or reduction in chromosome number. Gene instability in somatic tissues was reported for the na na and xc xc alleles which control, respectively, habit of growth and leaf size, and the color of the ripened fruits. No case of somatic instability of genes responsible for the color of leaves has been reported previously. Young leaves of coffee plants are usually green or of a dark or light bronze color ; mature leaves are green. Leaves of plants of the variety purpurascens (Coffea arabica L. var. purpurascens Cramer), however, present dark purple young leaves and slightly purple mature leaves. Purpurascens behaves as recessive to green. Among the progeny of a backcross (green x purpurascens) x purpurascens, a seedling was found that possessed normal green leaves except for two opposite branches arising from the same node. One of the branches was entirely purpurascens ; normal green and purpurascens areas could be seen in the mature leaves of the other. Since this plant had originally a non purpurascens phenotype, it should be a heterozygous Pr pr or a homozygous pr pr possessing in a heterozygous condition a factor that suppresses the expression of pr. This factor is now under investigation. The appearence of purpurascens tissues in the plant mentioned above is considered as due to a mutation of the Pr allele or of the other factor already mentioned. It is also recognized that chromosome Isos or a deficiency at one of the two loci could have produced the same result. pt_BR
dc.format pdf pt_BR
dc.language.iso pt_BR pt_BR
dc.publisher Instituto Agronômico (IAC) pt_BR
dc.relation.ispartofseries Bragantia;v. 13, n. 4, p. 11-12,1954;
dc.rights Open Access pt_BR
dc.subject.classification Cafeicultura::Genética e melhoramento pt_BR
dc.title Genética de Coffea. XIX - Mutação somática afetando a côr das fôlhas em café pt_BR
dc.title Genetics of Coffea. XIX. Somatic mutation affecting leaf color pt_BR
dc.type Artigo pt_BR

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