Data/hora: 08/06/2024 17:55:18

Provedor de dados: | 65
País: | Brazil
Título: | Free amino acids in the xylem sap of pear trees during dormancy
Autores: | Marafon,Anderson Carlos; Herter,Flavio Gilberto; Hawerroth,Fernando José; Bierhals,Adriana Neutzling.
Data: | 2016-07-01
Ano: | 2016
Palavras-chave: | Pyrus pyrifolia; Vascular sap; Nitrogenous compounds; Sprouting.
Resumo: | ABSTRACT: Storage and remobilization are considered key processes for the effective use of nitrogen in temperate fruit trees. As dormancy begins, storage proteins are synthesized, coinciding with a reduction in the levels of free amino acids. Consequently, as dormancy breaks, these storage proteins are degraded, and an increase in the concentrations of amino acids occurs, in order to support new growth. The objective of this study was to evaluate water content of different vegetative tissues (buds, bark, and bole wood), volume of xylem sap, and free amino acid concentrations of xylem sap, during winter dormancy of Hosui Japanese pear trees (VL). Plant material was obtained from the Embrapa Temperate Climate experimental orchard at Pelotas, in the state of Rio Grande do Sul, Brazil. Xylem sap was extracted from the branches with the aid of a vacuum pump, and the free amino acids were determined by gas chromatography, using the EZ kit: Faast GC/FID (Phenomenex). Water content of buds, as well as the volume of sap and concentrations of both aspartic acid and asparagine, substantially increased over time, reaching maximum values in the phase preceding sprouting.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000701136
Editor: | Universidade Federal de Santa Maria
Relação: | 10.1590/0103-8478cr20131515
Formato: | text/html
Fonte: | Ciência Rural  v.46 n.7 2016
Fonte: | info:eu-repo/semantics/openAccess