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Cruzamento natural dentro da "cova" do cafeeiro

Show simple item record Monaco, L. C. Carvalho, A. Antunes Filho, Hermindo 2019-01-09T18:50:34Z 2019-01-09T18:50:34Z 1963-05
dc.identifier.citation MONACO, L. C.; CARVALHO, A.; ANTUNES FILHO, H. Cruzamento natural dentro da "cova" do cafeeiro. Bragantia, Campinas, v. 22, n. 4, p. 11-15, mai. 1963. pt_BR
dc.identifier.issn 1678-4499
dc.identifier.uri pt_BR
dc.description.abstract The rate of cross-pollination in Coffea arabica has been demonstrated to be variable according to the marker used. The following mutants have been tested in Campinas: cera (ce) 7.0 - 9.0% purpurascens (pr) 2.6 - 12.3%, cera-purpurascens (ce, pr) 8-9 - 20.0%, polyorthotropica (po) 15.0% and xanthocarpa (xc) 12.4%. The trial here reported was accomplished in order to study the outcrossing rate among coffee trees planted in the same hole, as coffee is commercially grown in São Paulo. Five treatments were included in a randomized block design. The treatments differed in the proportion of individuals producing yellow or green endosperm per hole: A - four individual cece (yellow endosperm); B - three cece and one cece (green endosperm); C - two cece and two CeCe; D - one cece and three CeCe. A fifth treatment with a single cece plant per hole was included in order to compare the results with those previously obtained. The rate of outcrossing was found to increase linearly with the increase of Cece individual in the four plant hole. The treatment D showed an average of 16.0% of cross pollination. The reaults for holes with a single cece plant confirmed those obmed by other authors (9.1%). Differences were found in the proportions of the various seed types (peaberry, elephant and flat beans) in the green seeds resulting from crossfertilization in comparison with the same seed types of the cera type. The results obtained indicate that a coffee population derived from a plantation with four plant per hole should have a higher genetic variability than previously thought. This information would explain, in part, the success obtained in the breeding program by the pedigree method. 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. 22, n. 4, p. 11-15, 1963
dc.rights Open Access pt_BR
dc.subject.classification Cafeicultura::Genética e melhoramento pt_BR
dc.title Cruzamento natural dentro da "cova" do cafeeiro pt_BR
dc.title Natural outcrossing among coffee trees in the same hole pt_BR
dc.type Artigo pt_BR

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