Data/hora: 01/06/2024 11:54:26

Biblioteca(s): | Embrapa Agrossilvipastoril.
Data corrente: | 04/02/2020
Data da última atualização: | 04/02/2020
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 (&#934;PSII) and electron transport rate (ETR) were performed in the OS5p Fluorometer (150 &#956;mol 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 &#956;mol m-2 s-1) and &#934;PSII (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.
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: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/210277/1/2019-cpamt-maurel-behling-chlorophyll-fluorescence-young-bertholletia-different-shading-levels.pdf
Registro original: | Embrapa Agrossilvipastoril (CPAMT)
Exemplares: | CPAMT - (1468-1) - UPC - RA - DD -  -  -  - DIS