Fotossíntese e potencial hídrico foliar de plantas jovens de andiroba submetidas à deficiência hídrica e à reidratação
O objetivo deste trabalho foi investigar o desempenho fotossintético de plantas jovens de andiroba (Carapa guianensis), submetidas à deficiência hídrica e à reidratação. As plantas foram irrigadas diariamente, em casa de vegetação, durante 15 dias. Após aclimatação, as plantas foram separadas em doi...
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Published in: | Pesquisa agropecuaria brasileira Vol. 44; no. 1; pp. 8 - 14 |
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Embrapa Informação TecnológicaPesquisa Agropecuária Brasileira
2009
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Abstract | O objetivo deste trabalho foi investigar o desempenho fotossintético de plantas jovens de andiroba (Carapa guianensis), submetidas à deficiência hídrica e à reidratação. As plantas foram irrigadas diariamente, em casa de vegetação, durante 15 dias. Após aclimatação, as plantas foram separadas em dois tratamentos: plantas irrigadas e não irrigadas. Quando a resposta fotossintética das plantas não irrigadas alcançou valores próximos a zero, as plantas foram reidratadas. A cada sete dias, durante 21 dias, foram realizadas as determinações das trocas gasosas e da fluorescência da clorofila a. O potencial hídrico foliar foi determinado no início e no fim do experimento. As taxas de fotossíntese líquida, condutância estomática e transpiração se reduziram em 88, 89 e 89%, respectivamente, após 21 dias de supressão da irrigação. Quanto às variáveis da fluorescência da clorofila a, observaram-se reduções de 27 a 58%. O potencial hídrico foliar das plantas foi reduzido em mais de quatro vezes, após 21 dias de deficiência hídrica. De quatro a oito dias após a reidratação, as plantas recuperaram as características fotossintéticas e o potencial hídrico foliar, o que indica que plantas jovens de andiroba apresentaram alta plasticidade fisiológica em relação ao estresse hídrico.
The objective of this work was to investigate the photosynthetic performance of young andiroba plants (Carapa guianensis) submitted to water stress and rewetting. The plants were irrigated daily in greenhouse conditions for 15 days. After acclimatization, the plants were separated randomly in two treatments, irrigated and non-irrigated plants. When the photosynthesis of the non-irrigated plants reached values close to zero, the plants were rewetted. Measurements of gas exchanges and chlorophyll a fluorescence were recorded on seven-day intervals, during 21 days. Plant water potentials were determined at the beginning and at the end of the experiment. Net photosynthesis, stomatal conductance, and transpiration rates were reduced by 88, 89, and 89%, respectively, after 21 days of water stress. In relation to chlorophyll a, fluorescence variables were reduced 27 to 58%. The plant water potential was reduced more than four times by 21 days of stress. With rewetting, seedlings recovered their photosynthetic characteristics in four to eight days as well as their water potential, indicating that young andiroba plants exhibited high physiological plasticity to water stress. |
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AbstractList | O objetivo deste trabalho foi investigar o desempenho fotossintético de plantas jovens de andiroba (Carapa guianensis), submetidas à deficiência hídrica e à reidratação. As plantas foram irrigadas diariamente, em casa de vegetação, durante 15 dias. Após aclimatação, as plantas foram separadas em dois tratamentos: plantas irrigadas e não irrigadas. Quando a resposta fotossintética das plantas não irrigadas alcançou valores próximos a zero, as plantas foram reidratadas. A cada sete dias, durante 21 dias, foram realizadas as determinações das trocas gasosas e da fluorescência da clorofila a. O potencial hídrico foliar foi determinado no início e no fim do experimento. As taxas de fotossíntese líquida, condutância estomática e transpiração se reduziram em 88, 89 e 89%, respectivamente, após 21 dias de supressão da irrigação. Quanto às variáveis da fluorescência da clorofila a, observaram-se reduções de 27 a 58%. O potencial hídrico foliar das plantas foi reduzido em mais de quatro vezes, após 21 dias de deficiência hídrica. De quatro a oito dias após a reidratação, as plantas recuperaram as características fotossintéticas e o potencial hídrico foliar, o que indica que plantas jovens de andiroba apresentaram alta plasticidade fisiológica em relação ao estresse hídrico. O objetivo deste trabalho foi investigar o desempenho fotossintético de plantas jovens de andiroba (Carapa guianensis), submetidas à deficiência hídrica e à reidratação. As plantas foram irrigadas diariamente, em casa de vegetação, durante 15 dias. Após aclimatação, as plantas foram separadas em dois tratamentos: plantas irrigadas e não irrigadas. Quando a resposta fotossintética das plantas não irrigadas alcançou valores próximos a zero, as plantas foram reidratadas. A cada sete dias, durante 21 dias, foram realizadas as determinações das trocas gasosas e da fluorescência da clorofila a. O potencial hídrico foliar foi determinado no início e no fim do experimento. As taxas de fotossíntese líquida, condutância estomática e transpiração se reduziram em 88, 89 e 89%, respectivamente, após 21 dias de supressão da irrigação. Quanto às variáveis da fluorescência da clorofila a, observaram-se reduções de 27 a 58%. O potencial hídrico foliar das plantas foi reduzido em mais de quatro vezes, após 21 dias de deficiência hídrica. De quatro a oito dias após a reidratação, as plantas recuperaram as características fotossintéticas e o potencial hídrico foliar, o que indica que plantas jovens de andiroba apresentaram alta plasticidade fisiológica em relação ao estresse hídrico. The objective of this work was to investigate the photosynthetic performance of young andiroba plants (Carapa guianensis) submitted to water stress and rewetting. The plants were irrigated daily in greenhouse conditions for 15 days. After acclimatization, the plants were separated randomly in two treatments, irrigated and non-irrigated plants. When the photosynthesis of the non-irrigated plants reached values close to zero, the plants were rewetted. Measurements of gas exchanges and chlorophyll a fluorescence were recorded on seven-day intervals, during 21 days. Plant water potentials were determined at the beginning and at the end of the experiment. Net photosynthesis, stomatal conductance, and transpiration rates were reduced by 88, 89, and 89%, respectively, after 21 days of water stress. In relation to chlorophyll a, fluorescence variables were reduced 27 to 58%. The plant water potential was reduced more than four times by 21 days of stress. With rewetting, seedlings recovered their photosynthetic characteristics in four to eight days as well as their water potential, indicating that young andiroba plants exhibited high physiological plasticity to water stress. |
Author | Guimarães, Diogo Gato Silva, Carlos Eduardo Moura da Gonçalves, José Francisco de Carvalho |
AuthorAffiliation | Instituto Nacional de Pesquisas da Amazônia |
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Keywords | espécie arbórea tree species deficit hídrico fluorescência da clorofila α water deficit Carapa guianensis trocas gasosas gas exchange chlorophyll α fluorescence |
Language | Portuguese |
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Snippet | O objetivo deste trabalho foi investigar o desempenho fotossintético de plantas jovens de andiroba (Carapa guianensis), submetidas à deficiência hídrica e à... |
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SubjectTerms | AGRICULTURE, DAIRY & ANIMAL SCIENCE AGRICULTURE, MULTIDISCIPLINARY Carapa guianensis chlorophyll α fluorescence deficit hídrico espécie arbórea fluorescência da clorofila α gas exchange tree species trocas gasosas water deficit |
Title | Fotossíntese e potencial hídrico foliar de plantas jovens de andiroba submetidas à deficiência hídrica e à reidratação |
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