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 | Acesso ao texto completo restrito à biblioteca da Embrapa Suínos e Aves. Para informações adicionais entre em contato com cnpsa.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
05/11/2020 |
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Data da última atualização: |
05/11/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ROCHA, R. F. B.; BAENA, M. M.; ESTOPA, A. de C.; GERVASIO, I. C.; IBELLI, A. M. G.; GIONBELLI, T. R. S.; GIONBELLI, M. P.; FREITAS, R. T. F. de; MEIRELLES, S. L. C. |
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Afiliação: |
RENATA DE FÁTIMA BRETANHA ROCHA, UFL; MARIELLE MOURA BAENA, UFL; ALINE DE CÁSSIA ESTOPA, UFL; IZALLY CARVALHO GERVÁSIO, ESALQ; ADRIANA MERCIA GUARATINI IBELLI, CNPSA; TATHYANE RAMALHO SANTOS GIONBELLI, UFL; MATEUS PIES GIONBELLI, UFL; RILKE TADEU FONSECA DE FREITAS, UFL; SARAH LAGUNA CONCEIÇÃO MEIRELLES, UFL. |
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Título: |
Differential expression of HSF1 and HSPA6 genes and physiological responses in Angus and Simmental cattle breeds. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Journal of Thermal Biology, v. 84, p. 92-98, 2019. |
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DOI: |
https://doi.org/10.1016/j.jtherbio.2019.06.002 |
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Idioma: |
Alemão |
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Conteúdo: |
Abstract: The aim of this study was to identify whether more and less adapted Angus and Simmental cattle differed in physiological responses and expression of the heat shock factor 1 (HSF1) and the heat shock 70 kDa protein 6 (HSPA6), when subjected to heat stress. Thirty bulls (n=15 ANG; n=15 SIM), extremes ?more adapted" and "less adapted" within each breed were selected to the heat tolerance test. They were selected according to an index based on the average of the respiratory rate obtained on two hot summer days from one hundred bulls. Before the heat tolerance test day, animals were taken to a paddock with water, grass and shade until 7 a.m. of the following day for morning measurements. They were kept in the barn without access to water and shade until 1 p.m. for the afternoon measurements. Respiratory rate in the morning (MRR) and afternoon (ARR), hair coat surface temperature in the morning (MST) and afternoon (AST), rectal temperature in the morning (MRT) and afternoon (ART) were measured and blood samples were collected for expression analysis of the HSF1 and HSPA6 genes. The MIXED procedure of SAS was used for all statistical analysis. The more adapted Simmental group had lesser values of MRR (P=0.023) and MRT (P=0.095), but there was no difference within Angus breed. The ARR was greater (P=0.004) in less adapted animals for both breeds. The ART was lower in the Simmental breed (P < 0.001). Less adapted had greater levels of mRNA of HSF1 (P=0.06) and HSPA6 (P=0.09). In conclusion, respiratory rate, rectal temperature and expression of the HSF1 and HSPA6 genes can be indicators of thermotolerance in taurine cattle. Both breeds show physiologically similar responses under heat stress conditions. MenosAbstract: The aim of this study was to identify whether more and less adapted Angus and Simmental cattle differed in physiological responses and expression of the heat shock factor 1 (HSF1) and the heat shock 70 kDa protein 6 (HSPA6), when subjected to heat stress. Thirty bulls (n=15 ANG; n=15 SIM), extremes ?more adapted" and "less adapted" within each breed were selected to the heat tolerance test. They were selected according to an index based on the average of the respiratory rate obtained on two hot summer days from one hundred bulls. Before the heat tolerance test day, animals were taken to a paddock with water, grass and shade until 7 a.m. of the following day for morning measurements. They were kept in the barn without access to water and shade until 1 p.m. for the afternoon measurements. Respiratory rate in the morning (MRR) and afternoon (ARR), hair coat surface temperature in the morning (MST) and afternoon (AST), rectal temperature in the morning (MRT) and afternoon (ART) were measured and blood samples were collected for expression analysis of the HSF1 and HSPA6 genes. The MIXED procedure of SAS was used for all statistical analysis. The more adapted Simmental group had lesser values of MRR (P=0.023) and MRT (P=0.095), but there was no difference within Angus breed. The ARR was greater (P=0.004) in less adapted animals for both breeds. The ART was lower in the Simmental breed (P < 0.001). Less adapted had greater levels of mRNA of HSF1 (P=0.06) and HSPA6 (P=0.09... Mostrar Tudo |
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Palavras-Chave: |
Adaptabilidade; Estresse por calor; Gado Angus; Gado taurino; Heat shock 70 kDa protein 6; Heat shock factor 1; HSF1; HSP; HSPA6. |
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Thesagro: |
Clima Tropical; Gado Simental; Genética Animal; Pecuária; Produção Animal. |
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Thesaurus Nal: |
Angus; Animal genetics; Animal production; Cattle breeds; Heat shock proteins; Livestock; Simmental. |
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Categoria do assunto: |
-- |
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Marc: |
null
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Registro original: |
Embrapa Suínos e Aves (CNPSA) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
22/02/2010 |
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Data da última atualização: |
16/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
CORDEIRO, Y. E. M.; PINHEIRO, H. A.; SANTOS FILHO, B. G. dos; CORREA, S. S.; SILVA, J. R. R. e; DIAS-FILHO, M. B. |
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Afiliação: |
UFRA; UFRA; UFRA; UFRA; UFRA; MOACYR BERNARDINO DIAS FILHO, CPATU. |
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Título: |
Physiological and morphological responses of young mahogany (Swietenia macrophylla King) plants to drought. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Forest Ecology and Management, v. 258, n. 7, p. 1449-1455, Sep. 2009. |
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DOI: |
10.1016/j.foreco.2009.06.054 |
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Idioma: |
Inglês |
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Conteúdo: |
Young mahogany (Swietenia macrophylla King) plants were grown under either well-watered (pre-dawn leaf water potential, ?pd, ca. ?0.40 MPa) or drought (?pd, ca. ?3.52 MPa) conditions to examine some physiological strategies that allow the maintenance of leaf turgor. In well-watered plants, stomatal conductance (gs) was nearly constant (440 mmol m?2 s?1) between 7:00 and 13:00 h. This was accomplished by significant increases in transpiration (E) and apparent total hydraulic conductance (KT), in which averages were higher at 13:00 h. From 13:00 to 17:00 h, gs, E, and KT decreased sharply, reaching their lower values at 17:00 h. In these plants, significant increases in height (116%), stem diameter (50%) and leaf area (200%) were registered over the experimental period (20 days). Analyses of linear regression between gs or E and leaf-to-air vapor pressure deficit (?w) were not significant. In water-stressed plants, gs and E were higher at 7:00 h and lower from 9:00 to 17:00 h, while KT was higher in early morning (7:00 h) and in late afternoon (17:00 h) than between 9:00 and 15:00 h. Moreover, both gs and E decreased potentially (P < 0.001) with the diurnal increases on ?w. Drought also decreased leaf and leaflet numbers and reduced total leaf area, but had no effect on stem height and diameter. Leaf proline was higher (ca. 400%, between 13:00 and 15:00 h) in water-stressed plants, suggesting osmotic adjustment under drought. Twelve hours after resumption of irrigation, ?pd was similar (P > 0.05) between well-watered and drought-stressed plants, suggesting an ability of plants to recover turgor after stress cessation. Altogether, our data support the hypothesis that young mahogany plants have the ability to satisfactorily tolerate or postpone drought. MenosYoung mahogany (Swietenia macrophylla King) plants were grown under either well-watered (pre-dawn leaf water potential, ?pd, ca. ?0.40 MPa) or drought (?pd, ca. ?3.52 MPa) conditions to examine some physiological strategies that allow the maintenance of leaf turgor. In well-watered plants, stomatal conductance (gs) was nearly constant (440 mmol m?2 s?1) between 7:00 and 13:00 h. This was accomplished by significant increases in transpiration (E) and apparent total hydraulic conductance (KT), in which averages were higher at 13:00 h. From 13:00 to 17:00 h, gs, E, and KT decreased sharply, reaching their lower values at 17:00 h. In these plants, significant increases in height (116%), stem diameter (50%) and leaf area (200%) were registered over the experimental period (20 days). Analyses of linear regression between gs or E and leaf-to-air vapor pressure deficit (?w) were not significant. In water-stressed plants, gs and E were higher at 7:00 h and lower from 9:00 to 17:00 h, while KT was higher in early morning (7:00 h) and in late afternoon (17:00 h) than between 9:00 and 15:00 h. Moreover, both gs and E decreased potentially (P < 0.001) with the diurnal increases on ?w. Drought also decreased leaf and leaflet numbers and reduced total leaf area, but had no effect on stem height and diameter. Leaf proline was higher (ca. 400%, between 13:00 and 15:00 h) in water-stressed plants, suggesting osmotic adjustment under drought. Twelve hours after resumption of irrigation, ?pd wa... Mostrar Tudo |
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Palavras-Chave: |
Transpiração. |
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Thesagro: |
Água; Mogno. |
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Categoria do assunto: |
-- |
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Marc: |
null
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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