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Registro Completo |
Biblioteca(s): |
Embrapa Agrossilvipastoril. |
Data corrente: |
04/02/2020 |
Data da última atualização: |
04/02/2020 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
SILVA, K. N. C.; MAGOSSO, B. F.; MULLER, G. V. M.; PIZZATTO, M.; SANTOS, L. B.; BEHLING, M.; FELIPE, R. T. A.; SILVA, A. C. da. |
Afiliação: |
KALISTO NATAM CARNEIRO SILVA, UFMT, Sinop-MT; BEATRIZ FELTRIN MAGOSSO, UFMT, Sinop-MT; GABRIEL VINÍCIUS MIRANDA MULLER, UFMT, Sinop-MT; MARIANA PIZZATTO, UFMT, Sinop-MT; LUCAS BARTOLOMEU SANTOS, UFMT, Sinop-MT; MAUREL BEHLING, CPAMT; RAFAELLA TELES ARANTES FELIPE, UFMT, Sinop-MT; ANDRÉA CARVALHO DA SILVA, UFMT, Sinop-MT. |
Título: |
Chlorophyll a fluorescence in young Bertholletia excelsa BONPL. plants subjected to different shading levels. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
In: BRAZILIAN CONGRESS OF PLANT PHYSIOLOGY, 17., 2019, Cuiabá. Challenges for plant physiology; Food production and sustanability: [anais]. [Rio Claro, SP: SBFV], 2019. p. 26. |
Série: |
2675-1267 |
Idioma: |
Inglês |
Conteúdo: |
Photochemical responses are directly dependent on the level of incident solar radiation during the initial establishment of forest species. The aim of the current study was to evaluate chlorophyll a fluorescence in 2-year-old Bertholletia excelsa seedlings from July to October 2017. Samples were acclimated on polyolefin screens under different quantitative (35%, 50%, 65% and 80%) and qualitative (thermo-reflective, red, blue and green screens, at 50% solar radiation attenuation) shading levels and under full sun at the 77th, 105th, 122nd and 150th days after acclimation - DAA - (73 days) in Sinop County - MT. Estimates of effective quantum yield (ΦPSII) and electron transport rate (ETR) were performed in the OS5p Fluorometer (150 μmol m-2 s-1 PAR). The experimental design was completely randomized in factorial arrangements (5 x 4) and (6 x 4) (shading levels x time), with three repetitions (seedling). Data were subjected to analysis of variance, at 5% and 10% significance levels. There was significant interaction between shading and time; the maximum ETR (38.26 μmol m-2 s-1) and ΦPSII (0.77) points were estimated at the 116th DAA, at 77% and 76% shading levels, respectively. Red and green screens increased fluorescence parameters throughout the growth period. Seedlings showed low ability to differentiate changes in the quality of the intercepted light, however, those acclimated under full sun were less efficient to photochemically dissipate light energy. We conclude that intermediate shading levels (50% and 65%) increase the efficiency of Brazil nut tree seedlings in converting solar energy into chemical energy. MenosPhotochemical responses are directly dependent on the level of incident solar radiation during the initial establishment of forest species. The aim of the current study was to evaluate chlorophyll a fluorescence in 2-year-old Bertholletia excelsa seedlings from July to October 2017. Samples were acclimated on polyolefin screens under different quantitative (35%, 50%, 65% and 80%) and qualitative (thermo-reflective, red, blue and green screens, at 50% solar radiation attenuation) shading levels and under full sun at the 77th, 105th, 122nd and 150th days after acclimation - DAA - (73 days) in Sinop County - MT. Estimates of effective quantum yield (ΦPSII) and electron transport rate (ETR) were performed in the OS5p Fluorometer (150 μmol m-2 s-1 PAR). The experimental design was completely randomized in factorial arrangements (5 x 4) and (6 x 4) (shading levels x time), with three repetitions (seedling). Data were subjected to analysis of variance, at 5% and 10% significance levels. There was significant interaction between shading and time; the maximum ETR (38.26 μmol m-2 s-1) and ΦPSII (0.77) points were estimated at the 116th DAA, at 77% and 76% shading levels, respectively. Red and green screens increased fluorescence parameters throughout the growth period. Seedlings showed low ability to differentiate changes in the quality of the intercepted light, however, those acclimated under full sun were less efficient to photochemically dissipate light energy. ... Mostrar Tudo |
Palavras-Chave: |
Mato Grosso; Sinop. |
Thesagro: |
Bertholletia Excelsa. |
Thesaurus Nal: |
Brazil nuts; Electron transport chain. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/210277/1/2019-cpamt-maurel-behling-chlorophyll-fluorescence-young-bertholletia-different-shading-levels.pdf
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Marc: |
LEADER 02576nam a2200265 a 4500 001 2119852 005 2020-02-04 008 2019 bl uuuu u00u1 u #d 100 1 $aSILVA, K. N. C. 245 $aChlorophyll a fluorescence in young Bertholletia excelsa BONPL. plants subjected to different shading levels.$h[electronic resource] 260 $aIn: BRAZILIAN CONGRESS OF PLANT PHYSIOLOGY, 17., 2019, Cuiabá. Challenges for plant physiology; Food production and sustanability: [anais]. [Rio Claro, SP: SBFV], 2019. p. 26.$c2019 490 $a2675-1267 520 $aPhotochemical responses are directly dependent on the level of incident solar radiation during the initial establishment of forest species. The aim of the current study was to evaluate chlorophyll a fluorescence in 2-year-old Bertholletia excelsa seedlings from July to October 2017. Samples were acclimated on polyolefin screens under different quantitative (35%, 50%, 65% and 80%) and qualitative (thermo-reflective, red, blue and green screens, at 50% solar radiation attenuation) shading levels and under full sun at the 77th, 105th, 122nd and 150th days after acclimation - DAA - (73 days) in Sinop County - MT. Estimates of effective quantum yield (ΦPSII) and electron transport rate (ETR) were performed in the OS5p Fluorometer (150 μmol m-2 s-1 PAR). The experimental design was completely randomized in factorial arrangements (5 x 4) and (6 x 4) (shading levels x time), with three repetitions (seedling). Data were subjected to analysis of variance, at 5% and 10% significance levels. There was significant interaction between shading and time; the maximum ETR (38.26 μmol m-2 s-1) and ΦPSII (0.77) points were estimated at the 116th DAA, at 77% and 76% shading levels, respectively. Red and green screens increased fluorescence parameters throughout the growth period. Seedlings showed low ability to differentiate changes in the quality of the intercepted light, however, those acclimated under full sun were less efficient to photochemically dissipate light energy. We conclude that intermediate shading levels (50% and 65%) increase the efficiency of Brazil nut tree seedlings in converting solar energy into chemical energy. 650 $aBrazil nuts 650 $aElectron transport chain 650 $aBertholletia Excelsa 653 $aMato Grosso 653 $aSinop 700 1 $aMAGOSSO, B. F. 700 1 $aMULLER, G. V. M. 700 1 $aPIZZATTO, M. 700 1 $aSANTOS, L. B. 700 1 $aBEHLING, M. 700 1 $aFELIPE, R. T. A. 700 1 $aSILVA, A. C. da
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Embrapa Agrossilvipastoril (CPAMT) |
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Biblioteca(s): |
Embrapa Rondônia. |
Data corrente: |
29/06/2023 |
Data da última atualização: |
01/07/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
PFEIFER, L. F. M.; LIMA, R. A. de; NAKASHIMA, S. H.; SILVA, J. T. da; SCHMITT, E. |
Afiliação: |
LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; RHUAN AMORIM DE LIMA, CPAF-RO; SIDNEI HIROKI NAKASHIMA, DELAVAL BRASIL LTDA; JACKELINE THAÍS DA SILVA, DELAVAL BRASIL LTDA; EDUARDO SCHMITT, UNIVERSIDADE FEDERAL DE PELOTAS. |
Título: |
Early versus late body condition score loss in dairy cows: reproductive performance. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Tropical Animal Health and Production, v. 55, article 149, Apr. 2023. |
DOI: |
https://doi.org/10.1007/s11250-023-03559-7 |
Idioma: |
Inglês |
Conteúdo: |
This study aimed to compare milk production and reproductive performance in high yield Holstein cows that lose BCS early and late in the postpartum period. Lactating dairy cows (n = 76) were received frst timed AI at 60 to 75 DIM using the farm-managed estradiol-progesterone-GnRH?based timed AI protocol. The BCS of all cows was daily evaluated by automated BCS cameras. Aiming to evaluate the efect of the days in milk (DIM) in which a cow reached the nadir BCS on the reproductive parameters, cows were separated into two groups: early BCS loss (n = 42), cows that reached the nadir BCS ≤ 34 DIM, and late BCS loss (n = 34), cows that reached the nadir BCS > 34 DIM. The optimal cut-of point for determining the relationship between days to nadir BCS and pregnancy by 150 DIM (P150) was calculated using the receiver operating characteristic (ROC) curve. From the ROC analysis, the cut-of was 34 DIM (Se, 80.9%; Sp, 66.7%; AUC, 0.74; P < 0.01). No diferences (P>0.05) were detected between groups on the BCS and milk production. The average of milk production in both groups was 46.65 ± 6.15 Kg/day. Cows that reached the nadir BCS early postpartum presented lower (P < 0.01) calving interval and greater (P < 0.01) pregnancy at frst AI and P150. In summary, cows that lost BCS early had better reproductive performance and had similar milk yield compared with cows that lost BCS late in the postpartum period. |
Palavras-Chave: |
Carambeí (PR); Fazenda leiteira; Paraná. |
Thesagro: |
Condição Corporal; Inseminação Artificial; Ovulação; Pós-Parto; Prenhez; Produção Leiteira; Reprodução Animal; Vaca Leiteira. |
Thesaurus NAL: |
Animal reproduction; Artificial insemination; Body condition; Dairy cows; Milk production; Ovulation; Postpartum period; Pregnancy. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1154710/1/cpafro-18959.pdf
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Marc: |
LEADER 02619naa a2200409 a 4500 001 2154710 005 2023-07-01 008 2023 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1007/s11250-023-03559-7$2DOI 100 1 $aPFEIFER, L. F. M. 245 $aEarly versus late body condition score loss in dairy cows$breproductive performance.$h[electronic resource] 260 $c2023 520 $aThis study aimed to compare milk production and reproductive performance in high yield Holstein cows that lose BCS early and late in the postpartum period. Lactating dairy cows (n = 76) were received frst timed AI at 60 to 75 DIM using the farm-managed estradiol-progesterone-GnRH?based timed AI protocol. The BCS of all cows was daily evaluated by automated BCS cameras. Aiming to evaluate the efect of the days in milk (DIM) in which a cow reached the nadir BCS on the reproductive parameters, cows were separated into two groups: early BCS loss (n = 42), cows that reached the nadir BCS ≤ 34 DIM, and late BCS loss (n = 34), cows that reached the nadir BCS > 34 DIM. The optimal cut-of point for determining the relationship between days to nadir BCS and pregnancy by 150 DIM (P150) was calculated using the receiver operating characteristic (ROC) curve. From the ROC analysis, the cut-of was 34 DIM (Se, 80.9%; Sp, 66.7%; AUC, 0.74; P < 0.01). No diferences (P>0.05) were detected between groups on the BCS and milk production. The average of milk production in both groups was 46.65 ± 6.15 Kg/day. Cows that reached the nadir BCS early postpartum presented lower (P < 0.01) calving interval and greater (P < 0.01) pregnancy at frst AI and P150. In summary, cows that lost BCS early had better reproductive performance and had similar milk yield compared with cows that lost BCS late in the postpartum period. 650 $aAnimal reproduction 650 $aArtificial insemination 650 $aBody condition 650 $aDairy cows 650 $aMilk production 650 $aOvulation 650 $aPostpartum period 650 $aPregnancy 650 $aCondição Corporal 650 $aInseminação Artificial 650 $aOvulação 650 $aPós-Parto 650 $aPrenhez 650 $aProdução Leiteira 650 $aReprodução Animal 650 $aVaca Leiteira 653 $aCarambeí (PR) 653 $aFazenda leiteira 653 $aParaná 700 1 $aLIMA, R. A. de 700 1 $aNAKASHIMA, S. H. 700 1 $aSILVA, J. T. da 700 1 $aSCHMITT, E. 773 $tTropical Animal Health and Production$gv. 55, article 149, Apr. 2023.
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