The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L.
Abscisic acid was identified in extracts of cacao buds by combined gas-liquid chromatography/mass spectroscopy. Cytokinin activity was detected in these extracts by biological assay. Both hormones were found to vary in concentration in response to defoliation treatments. ABA levels in the leaves increased following depletion of soil moisture. The possible role of these hormones in the control of bud growth is discussed. It is suggested that a feed-back inhibition may operate in cacao and other species of intermittent growth, in that shoot growth can eventually become limited by a critical leaf area. According to this hypothesis, internal moisture stress, which appears to be a prerequisite for synchronous flushing of cacao under field conditions, would trigger the: hormonal control of bud growth, thanks to its effect on leaf shedding or on the formation of abscission layers
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1974
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Subjects: | THEOBROMA CACAO, SUSTANCIAS DE CRECIMIENTO VEGETAL, ETAPAS DE DESARROLLO DE LA PLANTA, ACIDO ABSCISICO, CITOCININAS, BRASIL, |
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KOHA-OAI-BVE:673652020-02-03T21:34:29ZThe possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. 42292 Alvim, R. 42289 Alvim, P. de T. 87676 Lorenzi, R. 116584 Saunders, P.F. 1974Abscisic acid was identified in extracts of cacao buds by combined gas-liquid chromatography/mass spectroscopy. Cytokinin activity was detected in these extracts by biological assay. Both hormones were found to vary in concentration in response to defoliation treatments. ABA levels in the leaves increased following depletion of soil moisture. The possible role of these hormones in the control of bud growth is discussed. It is suggested that a feed-back inhibition may operate in cacao and other species of intermittent growth, in that shoot growth can eventually become limited by a critical leaf area. According to this hypothesis, internal moisture stress, which appears to be a prerequisite for synchronous flushing of cacao under field conditions, would trigger the: hormonal control of bud growth, thanks to its effect on leaf shedding or on the formation of abscission layersAbscisic acid was identified in extracts of cacao buds by combined gas-liquid chromatography/mass spectroscopy. Cytokinin activity was detected in these extracts by biological assay. Both hormones were found to vary in concentration in response to defoliation treatments. ABA levels in the leaves increased following depletion of soil moisture. The possible role of these hormones in the control of bud growth is discussed. It is suggested that a feed-back inhibition may operate in cacao and other species of intermittent growth, in that shoot growth can eventually become limited by a critical leaf area. According to this hypothesis, internal moisture stress, which appears to be a prerequisite for synchronous flushing of cacao under field conditions, would trigger the: hormonal control of bud growth, thanks to its effect on leaf shedding or on the formation of abscission layersTHEOBROMA CACAOSUSTANCIAS DE CRECIMIENTO VEGETALETAPAS DE DESARROLLO DE LA PLANTAACIDO ABSCISICOCITOCININASBRASILRevista Theobroma (Brasil) |
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THEOBROMA CACAO SUSTANCIAS DE CRECIMIENTO VEGETAL ETAPAS DE DESARROLLO DE LA PLANTA ACIDO ABSCISICO CITOCININAS BRASIL THEOBROMA CACAO SUSTANCIAS DE CRECIMIENTO VEGETAL ETAPAS DE DESARROLLO DE LA PLANTA ACIDO ABSCISICO CITOCININAS BRASIL |
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THEOBROMA CACAO SUSTANCIAS DE CRECIMIENTO VEGETAL ETAPAS DE DESARROLLO DE LA PLANTA ACIDO ABSCISICO CITOCININAS BRASIL THEOBROMA CACAO SUSTANCIAS DE CRECIMIENTO VEGETAL ETAPAS DE DESARROLLO DE LA PLANTA ACIDO ABSCISICO CITOCININAS BRASIL 42292 Alvim, R. 42289 Alvim, P. de T. 87676 Lorenzi, R. 116584 Saunders, P.F. The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
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Abscisic acid was identified in extracts of cacao buds by combined gas-liquid chromatography/mass spectroscopy. Cytokinin activity was detected in these extracts by biological assay. Both hormones were found to vary in concentration in response to defoliation treatments. ABA levels in the leaves increased following depletion of soil moisture. The possible role of these hormones in the control of bud growth is discussed. It is suggested that a feed-back inhibition may operate in cacao and other species of intermittent growth, in that shoot growth can eventually become limited by a critical leaf area. According to this hypothesis, internal moisture stress, which appears to be a prerequisite for synchronous flushing of cacao under field conditions, would trigger the: hormonal control of bud growth, thanks to its effect on leaf shedding or on the formation of abscission layers |
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topic_facet |
THEOBROMA CACAO SUSTANCIAS DE CRECIMIENTO VEGETAL ETAPAS DE DESARROLLO DE LA PLANTA ACIDO ABSCISICO CITOCININAS BRASIL |
author |
42292 Alvim, R. 42289 Alvim, P. de T. 87676 Lorenzi, R. 116584 Saunders, P.F. |
author_facet |
42292 Alvim, R. 42289 Alvim, P. de T. 87676 Lorenzi, R. 116584 Saunders, P.F. |
author_sort |
42292 Alvim, R. |
title |
The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
title_short |
The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
title_full |
The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
title_fullStr |
The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
title_full_unstemmed |
The possible role of abscisic acid and cytokinins in growth rhythms of Theobroma cacao L. |
title_sort |
possible role of abscisic acid and cytokinins in growth rhythms of theobroma cacao l. |
publishDate |
1974 |
work_keys_str_mv |
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_version_ |
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