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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
24/01/2011 |
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Data da última atualização: |
04/09/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PARRON, L. M.; BUSTAMANTE, M. M. C.; MARKEWITZ, D. |
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Afiliação: |
LUCILIA MARIA PARRON VARGAS, CNPF; Mercedes Maria Cunha Bustamante, UnB; Daniel Markewitz, University of Georgia. |
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Título: |
Fluxes of nitrogen and phosphorus in a gallery forest in the Cerrado of central Brazil. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Biogeochemistry, v. 105, n. 1-3, p. 89-104, 2011. |
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DOI: |
10.1007/s10533-010-9537-z |
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Idioma: |
Inglês |
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Conteúdo: |
The Gallery forests of the Cerrado biome play a critical role in controlling stream chemistry but little information about biogeochemical processes in these ecosystems is available. This work describes the fluxes of N and P in solutions along a topographic gradient in a gallery forest. Three distinct floristic communities were identified along the gradient: a wet community nearest the stream, an upland dry community adjacent to the woodland savanna and an intermediate community between the two. Transects were marked in the three communities for sampling. Fluxes of N from bulk precipitation to these forests resulted in deposition of 12.6 kg ha-1 y-1 of total N of which 8.8 kg ha-1 was as inorganic N. The throughfall flux of total N was generally\8.4 kg ha-1 year-1. Throughfall NO3?N fluxes were higher (7?32%) while NH4?N and organic N fluxes were lower (54?69%and 5?46%) than those in bulk precipitation. The throughfall flux was slightly lower for the wet forest community compared to other communities. Litter leachate fluxes differed among floristic communities with higher NH4?N in the wet community. The total N flux was greater in the wet forest than in the dry forest (13.5 vs. 9.4 kg ha-1 year-1, respectively). The stream water had totalNflux of 0.3 kg ha-1 year-1. The flux of total P through bulk precipitation was 0.7 kg ha-1 year-1 while the mean fluxes of total P in throughfall (0.6 kg ha-1 year-1) and litter leachate (0.5 kg ha-1 year-1) declined but did not differ between communities. The low concentrations presented in soil solution and low fluxes in stream water (0.3 and 0.1 kg ha-1 year-1 for N and P, respectively) relative to other flowpaths emphasize the conservative nutrient cycling of these forests and the importance of internal recycling processes for the maintenance and conservation of riparian and stream ecosystems in the Cerrado. MenosThe Gallery forests of the Cerrado biome play a critical role in controlling stream chemistry but little information about biogeochemical processes in these ecosystems is available. This work describes the fluxes of N and P in solutions along a topographic gradient in a gallery forest. Three distinct floristic communities were identified along the gradient: a wet community nearest the stream, an upland dry community adjacent to the woodland savanna and an intermediate community between the two. Transects were marked in the three communities for sampling. Fluxes of N from bulk precipitation to these forests resulted in deposition of 12.6 kg ha-1 y-1 of total N of which 8.8 kg ha-1 was as inorganic N. The throughfall flux of total N was generally\8.4 kg ha-1 year-1. Throughfall NO3?N fluxes were higher (7?32%) while NH4?N and organic N fluxes were lower (54?69%and 5?46%) than those in bulk precipitation. The throughfall flux was slightly lower for the wet forest community compared to other communities. Litter leachate fluxes differed among floristic communities with higher NH4?N in the wet community. The total N flux was greater in the wet forest than in the dry forest (13.5 vs. 9.4 kg ha-1 year-1, respectively). The stream water had totalNflux of 0.3 kg ha-1 year-1. The flux of total P through bulk precipitation was 0.7 kg ha-1 year-1 while the mean fluxes of total P in throughfall (0.6 kg ha-1 year-1) and litter leachate (0.5 kg ha-1 year-1) declined but did not differ betwe... Mostrar Tudo |
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Palavras-Chave: |
Biogeochemical processe; Bulk precipitation; Floresta de galeria; Litter leachate; Processo biogeoquímico; Riparian zone. |
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Thesagro: |
Fósforo; Nitrogênio; Solo. |
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Thesaurus Nal: |
soil solution; throughfall. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02719naa a2200289 a 4500
001 1874109
005 2019-09-04
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1007/s10533-010-9537-z$2DOI
100 1 $aPARRON, L. M.
245 $aFluxes of nitrogen and phosphorus in a gallery forest in the Cerrado of central Brazil.$h[electronic resource]
260 $c2011
520 $aThe Gallery forests of the Cerrado biome play a critical role in controlling stream chemistry but little information about biogeochemical processes in these ecosystems is available. This work describes the fluxes of N and P in solutions along a topographic gradient in a gallery forest. Three distinct floristic communities were identified along the gradient: a wet community nearest the stream, an upland dry community adjacent to the woodland savanna and an intermediate community between the two. Transects were marked in the three communities for sampling. Fluxes of N from bulk precipitation to these forests resulted in deposition of 12.6 kg ha-1 y-1 of total N of which 8.8 kg ha-1 was as inorganic N. The throughfall flux of total N was generally\8.4 kg ha-1 year-1. Throughfall NO3?N fluxes were higher (7?32%) while NH4?N and organic N fluxes were lower (54?69%and 5?46%) than those in bulk precipitation. The throughfall flux was slightly lower for the wet forest community compared to other communities. Litter leachate fluxes differed among floristic communities with higher NH4?N in the wet community. The total N flux was greater in the wet forest than in the dry forest (13.5 vs. 9.4 kg ha-1 year-1, respectively). The stream water had totalNflux of 0.3 kg ha-1 year-1. The flux of total P through bulk precipitation was 0.7 kg ha-1 year-1 while the mean fluxes of total P in throughfall (0.6 kg ha-1 year-1) and litter leachate (0.5 kg ha-1 year-1) declined but did not differ between communities. The low concentrations presented in soil solution and low fluxes in stream water (0.3 and 0.1 kg ha-1 year-1 for N and P, respectively) relative to other flowpaths emphasize the conservative nutrient cycling of these forests and the importance of internal recycling processes for the maintenance and conservation of riparian and stream ecosystems in the Cerrado.
650 $asoil solution
650 $athroughfall
650 $aFósforo
650 $aNitrogênio
650 $aSolo
653 $aBiogeochemical processe
653 $aBulk precipitation
653 $aFloresta de galeria
653 $aLitter leachate
653 $aProcesso biogeoquímico
653 $aRiparian zone
700 1 $aBUSTAMANTE, M. M. C.
700 1 $aMARKEWITZ, D.
773 $tBiogeochemistry$gv. 105, n. 1-3, p. 89-104, 2011.
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Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
26/01/2023 |
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Data da última atualização: |
20/02/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ÁVILA, R. G.; MAGALHAES, P. C.; VITORINO, L. C.; BESSA, L. A.; SOUZA, K. R. D. de; QUEIROZ, R. B.; JAKELAITIS, A.; TEIXEIRA, M. B. |
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Afiliação: |
RONIEL GERALDO ÁVILA, Corporação Agro Simples; PAULO CESAR MAGALHAES, CNPMS; LUCIANA CRISTINA VITORINO, Instituto Federal Goiano; LAYARA ALEXANDRE BESSA, Instituto Federal Goiano; KAMILA REZENDE DÁZIO DE SOUZA, Universidade Federal de Alfenas; RAPHAEL BARROS QUEIROZ, Instituto Federal Goiano; ADRIANO JAKELAITIS, Instituto Federal Goiano; MARCONI BATISTA TEIXEIRA, Instituto Federal Goiano. |
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Título: |
Chitosan induces sorghum tolerance to water deficits by positively regulating photosynthesis and the production of primary metabolites, osmoregulators, and antioxidants. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Journal of Soil Science and Plant Nutrition, v. 23, p. 1156–1172, 2023. |
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DOI: |
https://doi.org/10.1007/s42729-022-01111-4 |
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Idioma: |
Inglês |
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Conteúdo: |
Current climate change scenarios require strategies that mitigate the efects of water defcits. Given that chitosan stimulates induced resistance responses, we tested the hypothesis that foliar application of this polysaccharide can have positive efects on the primary metabolite, antioxidant, and osmoregulatory metabolisms of sorghum, mitigating the efects of water defcit on grain yield. Sorghum plants were cultivated under either irrigated or water-defcit conditions and were either treated or untreated with chitosan, and we assessed the following responses: water potential, gas exchange, nutritional status, biosynthesis of primary and osmoregulatory metabolites, the activity of the antioxidant system constituents, and hydrogen peroxide and malondialdehyde contents. An active methodology was used to impose water stress on plants grown in pots with 20 kg of soil, 06 replications per treatment. Sorghum plants subjected to water defcit that were treated with chitosan exhibited higher stomatal conductance and transpiration than the untreated plants. Water restriction reduced the nutrient contents of leaves, but in the irrigated plants, chitosan treatment increased the tissue contents of certain nutrients and leaf concentrations of total proteins and total amino acids. In the plants under water-defcit conditions that were treated with chitosan, an elevated photosynthetic rate contributed to an increase in carbohydrate accumulation and a higher production of panicle and grain dry biomass compared with the untreated plants. The activity of catalase and ascorbate peroxidase also increased in response to chitosan. Overall, chitosan was efective in enhancing the water defcit tolerance of sorghum plants cultivated under water-defcit conditions by 57%. With this work, we generate perspectives for studies focusing on the development of water-defcit-resistant sorghum lineages, by means of chitosan elicitation. MenosCurrent climate change scenarios require strategies that mitigate the efects of water defcits. Given that chitosan stimulates induced resistance responses, we tested the hypothesis that foliar application of this polysaccharide can have positive efects on the primary metabolite, antioxidant, and osmoregulatory metabolisms of sorghum, mitigating the efects of water defcit on grain yield. Sorghum plants were cultivated under either irrigated or water-defcit conditions and were either treated or untreated with chitosan, and we assessed the following responses: water potential, gas exchange, nutritional status, biosynthesis of primary and osmoregulatory metabolites, the activity of the antioxidant system constituents, and hydrogen peroxide and malondialdehyde contents. An active methodology was used to impose water stress on plants grown in pots with 20 kg of soil, 06 replications per treatment. Sorghum plants subjected to water defcit that were treated with chitosan exhibited higher stomatal conductance and transpiration than the untreated plants. Water restriction reduced the nutrient contents of leaves, but in the irrigated plants, chitosan treatment increased the tissue contents of certain nutrients and leaf concentrations of total proteins and total amino acids. In the plants under water-defcit conditions that were treated with chitosan, an elevated photosynthetic rate contributed to an increase in carbohydrate accumulation and a higher production of panicle and grain dry b... Mostrar Tudo |
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Palavras-Chave: |
Desempenho fotossintético; Estresse hídrico; Osmorregulação; Quitosana. |
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Thesagro: |
Antioxidante; Enzima; Fotossíntese; Sorgo Granífero. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1151232/1/Chitosan-induces-sorghum-tolerance.pdf
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Marc: |
LEADER 02955naa a2200313 a 4500
001 2151232
005 2024-02-20
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s42729-022-01111-4$2DOI
100 1 $aÁVILA, R. G.
245 $aChitosan induces sorghum tolerance to water deficits by positively regulating photosynthesis and the production of primary metabolites, osmoregulators, and antioxidants.$h[electronic resource]
260 $c2023
520 $aCurrent climate change scenarios require strategies that mitigate the efects of water defcits. Given that chitosan stimulates induced resistance responses, we tested the hypothesis that foliar application of this polysaccharide can have positive efects on the primary metabolite, antioxidant, and osmoregulatory metabolisms of sorghum, mitigating the efects of water defcit on grain yield. Sorghum plants were cultivated under either irrigated or water-defcit conditions and were either treated or untreated with chitosan, and we assessed the following responses: water potential, gas exchange, nutritional status, biosynthesis of primary and osmoregulatory metabolites, the activity of the antioxidant system constituents, and hydrogen peroxide and malondialdehyde contents. An active methodology was used to impose water stress on plants grown in pots with 20 kg of soil, 06 replications per treatment. Sorghum plants subjected to water defcit that were treated with chitosan exhibited higher stomatal conductance and transpiration than the untreated plants. Water restriction reduced the nutrient contents of leaves, but in the irrigated plants, chitosan treatment increased the tissue contents of certain nutrients and leaf concentrations of total proteins and total amino acids. In the plants under water-defcit conditions that were treated with chitosan, an elevated photosynthetic rate contributed to an increase in carbohydrate accumulation and a higher production of panicle and grain dry biomass compared with the untreated plants. The activity of catalase and ascorbate peroxidase also increased in response to chitosan. Overall, chitosan was efective in enhancing the water defcit tolerance of sorghum plants cultivated under water-defcit conditions by 57%. With this work, we generate perspectives for studies focusing on the development of water-defcit-resistant sorghum lineages, by means of chitosan elicitation.
650 $aAntioxidante
650 $aEnzima
650 $aFotossíntese
650 $aSorgo Granífero
653 $aDesempenho fotossintético
653 $aEstresse hídrico
653 $aOsmorregulação
653 $aQuitosana
700 1 $aMAGALHAES, P. C.
700 1 $aVITORINO, L. C.
700 1 $aBESSA, L. A.
700 1 $aSOUZA, K. R. D. de
700 1 $aQUEIROZ, R. B.
700 1 $aJAKELAITIS, A.
700 1 $aTEIXEIRA, M. B.
773 $tJournal of Soil Science and Plant Nutrition$gv. 23, p. 1156–1172, 2023.
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Embrapa Milho e Sorgo (CNPMS) |
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