|
|
|
|
|
| Pescador,Rosete; Kerbauy,Gilberto Barbante; Viviani,Daniela; Kraus,Jane Elizabeth. |
| Somatic embryogenesis represents a valuable tool for the studies on the basic aspects of plant embryo development. Today this process is used as a potencial technique for large-scale plant micropropagation although, so far, it has been applied to only a small number of species. However, when somatic embryos are malformed they are considered economically useless. In Acca sellowiana (O. Berg) Burret, an important fruit-producing crop, large amounts of anomalous somatic embryos (76.3%) were found just after 40 days of culture of explants in a 2,4-D containing medium. Among the anomalous forms found in the cotiledonary stage, 12.2% consisted of fused embryos, 40.4% displayed fused cotyledons, 13.0% presented supernumerary cotyledons, and 10.7% showed absence... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2; 4-D feijoa morphohistological analysis somaclonal variation somatic embryogenesis. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000100014 |
| |
|
|
| Esemann-Quadros,Karin; Mota,Ana Paula; Kerbauy,Gilberto Barbante; Guerra,Miguel Pedro; Ducroquet,Jean Pierre Henri Joseph; Pescador,Rosete. |
| A Acca sellowiana Berg. (Myrtaceae) é uma frutífera nativa dos planaltos meridionais do Sul do Brasil e que se encontra em processo de domesticação. Seus frutos são doce-acidulados e podem ser consumidos in natura ou empregados para a produção de sucos e doces. Assim, informações sobre o desenvolvimento, morfologia e anatomia de seus frutos são de grande interesse e foram objetos do presente trabalho. O fruto (ovário mais hipanto), no tempo zero (plena floração), tem, em média, 0,6 cm de altura e 0,4 cm de diâmetro, sendo cerca de dez vezes menor que o fruto maduro. Longitudinalmente, identificam-se três regiões distintas: locular, sublocular e prolongamento. Transversalmente, na região mediana, estão delimitadas três regiões: 1) epiderme (casca): com... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Goiaba serrana; Anatomia do fruto; Crescimento do fruto. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452008000200005 |
| |
|
|
| Pescador,Rosete; Kerbauy,Gilberto Barbante; Strassburg,Rosali Constantino; Kraus,Jane Elizabeth. |
| Acca sellowiana has anatropous, bitegmic and crassinucellate ovules. The outer and inner integuments are double-layered except in the micropyle, where they are composed of more layers; the micropyle is zig-zag shaped. The egg apparatus lies at the micropylar pole, and the zynergids present a conspicuous filiform apparatus. The antipodal cells are present in the chalazal region, persisting before the occurrence of double fertilization. The zygote is visible 21 days after pollination; nuclear endosperm is already present. The first mitotic division of the zygote occurs at 24th day. The globular, cordiform and torpedo embryo stages can be seen at 30, 45 and 60 days after pollination, respectively. The mature embryo characterized by the presence of a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Feijoa; Megagametophyte; Ovule; Pineapple guava; Zygotic embryo. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000100017 |
| |
|
|
| Zaffari,Gilmar Roberto; Peres,Lázaro Eustáquio Pereira; Tcacenco,Fernando Adami; Kerbauy,Gilberto Barbante. |
| Nanism is one of the most frequent type of mutant in micropropagated banana plants from the Cavendish subgroup. The present study aimed at studying some of the hormone factors involved in this type of mutation. Rhizomes from normal and dwarf plants from the cultivar Grand Naine were incubated for 5 d in the presence of [³H]-L-tryptophan, [³H]-indole-3-acetic acid and gibberellin, to quantify the endogenous levels of indole-3-acetic acid-ester, indole-3-acetic acid-amide, free indole-3-acetic acid, and cytokinins. The endogenous levels of indole-3-acetic acid and its ester- and amide-conjugated forms were measured in normal and dwarf plants incubated for 30 d with gibberellin, indole-3-acetic acid, and L- and D-tryptophan. In normal plants, the use of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Indole-3-acetic acid metabolism; Growth regulators; Somaclonal variation. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000300005 |
| |
|
|
|
