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Papers by Gilberto Kerbauy

Research paper thumbnail of Dark-induced hormone changes coincide with the resumption of light-inhibited shoot growth in Catasetum fimbriatum (Orchidaceae

Journal of Plant Physiology, 2010

Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth le... more Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth leading to the formation of nodes and internodes. On the other hand, when these plants are incubated in the presence of light, shoot longitudinal growth is inhibited and pseudobulbs develop just below the shoot apical meristem. These facts provide evidence of a possible influence of light on mitotic cell division in the shoot apex as well as on pseudobulb initiation. The effects of light and dark on the interruption and/or maintenance of shoot apex mitotic activity and the subsequent formation of pseudobulbs in the sub-meristematic regions were investigated by means of histological and hormonal studies. The interruption of shoot apex development occurred around the 150th d of light incubation and seems to have resulted from the establishment of a strong storage sink in the region of the future pseudobulb, in detriment to the continuous activity of the shoot apical meristem. The reduced total cytokinins/IAA ratio in the apex, mainly due to high levels of IAA, could be a key factor in the interruption of cell divisions. Transfer to the dark brings about the resumption of shoot apex development of plants through the re-entrance of cells in the cell cycle which coincides with a significant increase in the total cytokinins/IAA ratio.

Research paper thumbnail of Anomalous somatic embryos in Acca sellowiana (O. Berg) Burret (Myrtaceae)

Revista Brasileira de Botânica, 2008

... Rosete Pescador I, 2 ; Gilberto Barbante Kerbauy II ; Daniela Viviani I ; Jane Elizabeth Krau... more ... Rosete Pescador I, 2 ; Gilberto Barbante Kerbauy II ; Daniela Viviani I ; Jane Elizabeth Kraus II. ... Feijoa sellowiana O. Berg) is a native plant to the southern region of the Brazilian Plateau, and is also found in Uruguay and Argentina (Mattos 1990). ...

Research paper thumbnail of Effects of NO3-, NH4+ and urea nutrition on endogenous levels of IAA and four cytokinins in two epiphytic bromeliads

Plant Cell and Environment, 1997

Research paper thumbnail of Photoperiod and temperature effects on in vitro growth and flowering of P. pusilla, an epiphytic orchid

Plant Physiology and Biochemistry, 2004

Research paper thumbnail of High cytokinin accumulation following root tip excision changes the endogenous auxin-to-cytokinin ratio during root-to-shoot conversion in Catasetum fimbriatum Lindl (Orchidaceae)

Research paper thumbnail of The role of γ-aminobutyric acid (Gaba) in somatic embryogenesis of Acca sellowiana Berg.(Myrtaceae)

Brazilian Journal of …, 2009

Research paper thumbnail of Dark-induced hormone changes coincide with the resumption of light-inhibited shoot growth in Catasetum fimbriatum (Orchidaceae)

Journal of Plant Physiology, 2010

Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth le... more Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth leading to the formation of nodes and internodes. On the other hand, when these plants are incubated in the presence of light, shoot longitudinal growth is inhibited and pseudobulbs develop just below the shoot apical meristem. These facts provide evidence of a possible influence of light on mitotic cell division in the shoot apex as well as on pseudobulb initiation. The effects of light and dark on the interruption and/or maintenance of shoot apex mitotic activity and the subsequent formation of pseudobulbs in the sub-meristematic regions were investigated by means of histological and hormonal studies. The interruption of shoot apex development occurred around the 150th d of light incubation and seems to have resulted from the establishment of a strong storage sink in the region of the future pseudobulb, in detriment to the continuous activity of the shoot apical meristem. The reduced total cytokinins/IAA ratio in the apex, mainly due to high levels of IAA, could be a key factor in the interruption of cell divisions. Transfer to the dark brings about the resumption of shoot apex development of plants through the re-entrance of cells in the cell cycle which coincides with a significant increase in the total cytokinins/IAA ratio.

Research paper thumbnail of Thidiazuron influences the endogenous levels of cytokinins and IAA during the flowering of isolated shoots of Dendrobium

Journal of Plant Physiology, 2006

Research paper thumbnail of Endogenous hormonal levels and growth of dark-incubated shoots of Catasetum fimbriatum

Journal of Plant Physiology, 2004

Research paper thumbnail of Thermoperiodic effect on flowering and endogenous hormonal status in Dendrobium (Orchidaceae)

Journal of Plant Physiology, 2004

Research paper thumbnail of Endogenous Levels of Cytokinins, Indoleacetic Acid, Abscisic Acid, and Pigments in Variegated Somaclones of Micropropagated Banana Leaves

Journal of Plant Growth Regulation, 1998

Research paper thumbnail of Micropropagation and genetic stability of a Dendrobium hybrid (Orchidaceae)

In Vitro Cellular & Developmental Biology - Plant, 2006

Research paper thumbnail of Changes in soluble carbohydrates and starch amounts during somatic and zygotic embryogenesis of Acca sellowiana (Myrtaceae)

In Vitro Cellular & Developmental Biology - Plant, 2008

... (Myrtaceae) Rosete Pescador & Gilberto B. Kerbauy &am... more ... (Myrtaceae) Rosete Pescador & Gilberto B. Kerbauy & Jane E. Kraus & Wagner de Melo Ferreira & Miguel Pedro Guerra & Rita de Cássia L. Figueiredo-Ribeiro ... Vertical bars indicate standard deviation and were not shown when they were lower than the symbol. 294 ...

Research paper thumbnail of Propagation, growth, and carbohydrates of Dendrobium Second Love (Orchidaceae) in vitro as affected by sucrose, light, and dark

In Vitro Cellular & Developmental Biology - Plant, 2011

Research paper thumbnail of Growth and nitrogen metabolism of Catasetum fimbriatum (orchidaceae) grown with different nitrogen sources

Environmental and Experimental Botany, 2000

Research paper thumbnail of Indole-3-acetic acid metabolism in normal and dwarf micropropagated banana plants (Musa spp. AAA)

Brazilian Journal of Plant Physiology, 2002

Research paper thumbnail of Effects of light and ethylene on endogenous hormones and development of Catasetum fimbriatum (Orchidaceae)

Brazilian Journal of Plant Physiology, 2006

Research paper thumbnail of Dry matter partitioning differences between shoots and roots in two contrasting genotypes of orchids and their relationship with endogenous levels of auxins, cytokinins and abscisic acid

Revista Brasileira de Fisiologia Vegetal, 2001

Research paper thumbnail of Changes in soluble carbohydrates and starch partitioning during vegetative bud formation from root tips of Catasetum fimbriatum (Orchidaceae)

Plant cell, tissue and …, 1998

Research paper thumbnail of Hormonal and histological studies related to in vitro banana bud formation

Plant cell, tissue and …, 2000

Research paper thumbnail of Dark-induced hormone changes coincide with the resumption of light-inhibited shoot growth in Catasetum fimbriatum (Orchidaceae

Journal of Plant Physiology, 2010

Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth le... more Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth leading to the formation of nodes and internodes. On the other hand, when these plants are incubated in the presence of light, shoot longitudinal growth is inhibited and pseudobulbs develop just below the shoot apical meristem. These facts provide evidence of a possible influence of light on mitotic cell division in the shoot apex as well as on pseudobulb initiation. The effects of light and dark on the interruption and/or maintenance of shoot apex mitotic activity and the subsequent formation of pseudobulbs in the sub-meristematic regions were investigated by means of histological and hormonal studies. The interruption of shoot apex development occurred around the 150th d of light incubation and seems to have resulted from the establishment of a strong storage sink in the region of the future pseudobulb, in detriment to the continuous activity of the shoot apical meristem. The reduced total cytokinins/IAA ratio in the apex, mainly due to high levels of IAA, could be a key factor in the interruption of cell divisions. Transfer to the dark brings about the resumption of shoot apex development of plants through the re-entrance of cells in the cell cycle which coincides with a significant increase in the total cytokinins/IAA ratio.

Research paper thumbnail of Anomalous somatic embryos in Acca sellowiana (O. Berg) Burret (Myrtaceae)

Revista Brasileira de Botânica, 2008

... Rosete Pescador I, 2 ; Gilberto Barbante Kerbauy II ; Daniela Viviani I ; Jane Elizabeth Krau... more ... Rosete Pescador I, 2 ; Gilberto Barbante Kerbauy II ; Daniela Viviani I ; Jane Elizabeth Kraus II. ... Feijoa sellowiana O. Berg) is a native plant to the southern region of the Brazilian Plateau, and is also found in Uruguay and Argentina (Mattos 1990). ...

Research paper thumbnail of Effects of NO3-, NH4+ and urea nutrition on endogenous levels of IAA and four cytokinins in two epiphytic bromeliads

Plant Cell and Environment, 1997

Research paper thumbnail of Photoperiod and temperature effects on in vitro growth and flowering of P. pusilla, an epiphytic orchid

Plant Physiology and Biochemistry, 2004

Research paper thumbnail of High cytokinin accumulation following root tip excision changes the endogenous auxin-to-cytokinin ratio during root-to-shoot conversion in Catasetum fimbriatum Lindl (Orchidaceae)

Research paper thumbnail of The role of γ-aminobutyric acid (Gaba) in somatic embryogenesis of Acca sellowiana Berg.(Myrtaceae)

Brazilian Journal of …, 2009

Research paper thumbnail of Dark-induced hormone changes coincide with the resumption of light-inhibited shoot growth in Catasetum fimbriatum (Orchidaceae)

Journal of Plant Physiology, 2010

Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth le... more Catasetum fimbriatum plants cultivated in the absence of light exhibit continuous shoot growth leading to the formation of nodes and internodes. On the other hand, when these plants are incubated in the presence of light, shoot longitudinal growth is inhibited and pseudobulbs develop just below the shoot apical meristem. These facts provide evidence of a possible influence of light on mitotic cell division in the shoot apex as well as on pseudobulb initiation. The effects of light and dark on the interruption and/or maintenance of shoot apex mitotic activity and the subsequent formation of pseudobulbs in the sub-meristematic regions were investigated by means of histological and hormonal studies. The interruption of shoot apex development occurred around the 150th d of light incubation and seems to have resulted from the establishment of a strong storage sink in the region of the future pseudobulb, in detriment to the continuous activity of the shoot apical meristem. The reduced total cytokinins/IAA ratio in the apex, mainly due to high levels of IAA, could be a key factor in the interruption of cell divisions. Transfer to the dark brings about the resumption of shoot apex development of plants through the re-entrance of cells in the cell cycle which coincides with a significant increase in the total cytokinins/IAA ratio.

Research paper thumbnail of Thidiazuron influences the endogenous levels of cytokinins and IAA during the flowering of isolated shoots of Dendrobium

Journal of Plant Physiology, 2006

Research paper thumbnail of Endogenous hormonal levels and growth of dark-incubated shoots of Catasetum fimbriatum

Journal of Plant Physiology, 2004

Research paper thumbnail of Thermoperiodic effect on flowering and endogenous hormonal status in Dendrobium (Orchidaceae)

Journal of Plant Physiology, 2004

Research paper thumbnail of Endogenous Levels of Cytokinins, Indoleacetic Acid, Abscisic Acid, and Pigments in Variegated Somaclones of Micropropagated Banana Leaves

Journal of Plant Growth Regulation, 1998

Research paper thumbnail of Micropropagation and genetic stability of a Dendrobium hybrid (Orchidaceae)

In Vitro Cellular & Developmental Biology - Plant, 2006

Research paper thumbnail of Changes in soluble carbohydrates and starch amounts during somatic and zygotic embryogenesis of Acca sellowiana (Myrtaceae)

In Vitro Cellular & Developmental Biology - Plant, 2008

... (Myrtaceae) Rosete Pescador & Gilberto B. Kerbauy &am... more ... (Myrtaceae) Rosete Pescador & Gilberto B. Kerbauy & Jane E. Kraus & Wagner de Melo Ferreira & Miguel Pedro Guerra & Rita de Cássia L. Figueiredo-Ribeiro ... Vertical bars indicate standard deviation and were not shown when they were lower than the symbol. 294 ...

Research paper thumbnail of Propagation, growth, and carbohydrates of Dendrobium Second Love (Orchidaceae) in vitro as affected by sucrose, light, and dark

In Vitro Cellular & Developmental Biology - Plant, 2011

Research paper thumbnail of Growth and nitrogen metabolism of Catasetum fimbriatum (orchidaceae) grown with different nitrogen sources

Environmental and Experimental Botany, 2000

Research paper thumbnail of Indole-3-acetic acid metabolism in normal and dwarf micropropagated banana plants (Musa spp. AAA)

Brazilian Journal of Plant Physiology, 2002

Research paper thumbnail of Effects of light and ethylene on endogenous hormones and development of Catasetum fimbriatum (Orchidaceae)

Brazilian Journal of Plant Physiology, 2006

Research paper thumbnail of Dry matter partitioning differences between shoots and roots in two contrasting genotypes of orchids and their relationship with endogenous levels of auxins, cytokinins and abscisic acid

Revista Brasileira de Fisiologia Vegetal, 2001

Research paper thumbnail of Changes in soluble carbohydrates and starch partitioning during vegetative bud formation from root tips of Catasetum fimbriatum (Orchidaceae)

Plant cell, tissue and …, 1998

Research paper thumbnail of Hormonal and histological studies related to in vitro banana bud formation

Plant cell, tissue and …, 2000