Articles

POST-HARVEST STUDY OF LEAF BLACKENING IN PROTEA ‘PINK ICE’ AND ‘SUSARA’

Article number
937_94
Pages
769 – 776
Language
English
Abstract
Leaf blackening is an important post-harvest problem in several Protea species.
Usually it appears in susceptible cultivars several days after harvest, reducing flowers quality and impacting negatively the market value.
A study of mineral nutrients and oxidative stress was carried out in one commercial plantation of Protea where ‘Pink Ice’ and ‘Susara’ cultivars are grown, situated in La Palma island (Canarian Archipelago). Four foliar samplings were taken along 12 days in ‘Pink Ice’ (1, 4, 8 and 12 days after floral stems were harvested) and along 15 days in ‘Susara’ (1, 4, 8, 12 and 18 days). Mineral nutrient and quantification of hydrogen peroxide (important marker of oxidative stress), as well as quantification of the antioxidant enzyme peroxidase, were carried out in healthy and blackened leaves of these Protea cultivars.
Phosphorus and Mg contents of ‘Pink Ice’ were different to those of ‘Susara’ throughout the assay, but no relation was found among nutrient contents and blackening in both cultivars.
Neither peroxidase enzyme nor oxidative stress revealed any connection with this problem.

Publication
Authors
M. Hernández, F. Molina González, C.E. Álvarez, M. Fernández-Falcón, N. Fernández-García, E. Olmos
Keywords
nutrition, hydrogen peroxide, peroxidases
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