Data/hora: 10/06/2024 02:54:55

Provedor de dados: | Revista Brasileira de Fruticultura
País: | Brazil
Título: | Gas exchanges in peach palms as a function of the spad chlorophyll meter readings
Autores: | Tucci,Maria Luiza Sant'anna; Modolo,Valéria Aparecida; Erismann,Norma de Magalhães; Machado,Eduardo Caruso.
Data: | 2011-10-01
Ano: | 2011
Palavras-chave: | Bactris gasipaes Kunth; CO2 assimilation; Stomatal conductance.
Resumo: | The close relationship between the chlorophyll-meters readings and the total chlorophyll and nitrogen contents in leaves, has allowed their evaluation both in annual and perennial species. Besides, some physiological events such as the CO2 assimilation have also been estimated by chlorophyll meters. This work was carried out aiming to evaluate the gas exchanges of peach palms as a function of the chlorophyll SPAD-Meter readings. Three year-old peach palms from Yurimaguas, Peru were studied in Ubatuba, SP, Brazil, spaced 2 x 1 m in area under a natural gradient of organic matter which allowed four plots to be considered, according to the peach palms leaves colors, from light yellow to dark green. The SPAD readings and the stomatal frequency of leaflets were evaluated. The photosynthetic photon flux density (PPFD, μmol m-2 s-1), the leaf temperature (Tleaf, ºC), the CO2 assimilation (A, μmol m-2 s-1), the stomatal conductance (g s, mol m-2 s-1), the transpiration (E, mmol m-2 s-1) and the intercellular CO2 concentration (Ci, μmol mol-1) were evaluated with a portable infrared gas analyzer (LCA-4, ADC BioScientific Ltd., Great Amwell, U.K.). A linear increase in the CO2 assimilation as a function of the SPAD readings (y = -0.34 + 0.19x, R² = 0.99), indicates that they can be a rapid and cheap complementary method to evaluate in peach palms some important physiological events, such as CO2 assimilation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000500033
Editor: | Sociedade Brasileira de Fruticultura
Relação: | 10.1590/S0100-29452011000500033
Formato: | text/html
Fonte: | Revista Brasileira de Fruticultura  v.33 n.spe1 2011
Fonte: | info:eu-repo/semantics/openAccess