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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

EFFECTIVENESS OF POSTHARVEST SOLUTIONS FOR THE CONSERVATION OF CUT Oncidium varicosum (ORCHIDACEAE) INFLORESCENCES

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Author(s):
Claudia Fabrino Machado Mattiuz [1] ; Ben-Hur Mattiuz [2] ; Teresinha de Jesus Deléo Rodrigues [3] ; Kelly Magalhães Marques [4] ; Ramilo Nogueira Martins [5]
Total Authors: 5
Affiliation:
[1] Centro Universitário Moura Lacerda. Unidade II. Campus de Ribeirão Preto - Brasil
[2] Universidade Estadual Paulista/UNESP. Faculdade de Ciências Agrárias e Veterinária. Campus de Jaboticabal - Brasil
[3] Universidade Estadual Paulista/UNESP. Faculdade de Ciências Agrárias e Veterinária. Campus de Jaboticabal - Brasil
[4] Universidade Estadual Paulista/UNESP. Faculdade de Ciências Agrárias e Veterinária. Campus de Jaboticabal - Brasil
[5] Empresa de Pesquisa Agropecuária de Minas Gerais/EPAMIG. Unidade Regional Epamig Norte de Minas - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Ciência e Agrotecnologia; v. 39, n. 4, p. 315-322, 2015-08-00.
Abstract

The orchid Oncidium varicosum is a tropical plant with significant commercial value due to the beauty of its yellow inflorescences. Several authors have observed a reduction in the water content of cut flowers, consequently, wilting and senescence of petals are the main reasons for the termination of the decorative life of cut flowers. In this research, we studied the effects of several chemical compounds on the postharvest life of cut inflorescences of Oncidium varicosum 'Samurai'. These chemicals are as follows: sucrose (5%) plus 8-hidroxiquinoline citrate (8-HQC) (100 mg L-1) plus silver nitrate (AgNO3) (50 mg L-1); sucrose (5%) plus citric acid (75 mg L-1); quaternary ammonia at 30% (50 mg L-1); and sucrose (5%) plus quaternary ammonia at 30% (50 mg L-1). The highest values for average of relative water content, reducing carbohydrates and soluble sugars were recorded in the flowers treated with the sucrose (5%) plus 8-HQC (100 mg L-1) plus AgNO3 (50 mg L-1) solution. A reduction in color intensity occurred at 12 days postharvest in all treatments and the carotenoid content was reduced to the greatest extent in flowers maintained in distilled water. The lowest numbers of open flowers were observed at 12 and 15 days in the distilled water and quaternary ammonium treatments, being that the others treatments favored the anthesis. The Oncidium inflorescences treated with sucrose plus HQC plus AgNO3 demonstrated a higher number of open flowers and reached the longest longevity (22 days). (AU)