EVALUATION OF PLANT GROWTH REGULATORS TO INCREASE NICKEL PHYTOEXTRACTION BY ALYSSUM SPECIES
Recent studies have shown that application of phytohormones to shoots of Alyssum murale increased biomass production but did not increase Ni shoot concentration. Increased biomass and Ni phytoextraction efficiency is useful to achieve economically viable phytomining. The objective
of this study was to evaluate the effect of two types of phytohormones on the Ni phytoextraction capacity of four ALYSSUM species. Two different commercially available phytohormones (Cytokin® and Promalin®) based on cytokinins and/or gibberellins were applied on shoot biomass
of four Ni hyperaccumulating ALYSSUM species (A. corsicum, A.
malacitanum, A. murale, and A. pintodasilvae). Cytokin was applied in two concentrations and promalin in one concentration. The application of phytohormones had no clear positive effect on biomass production,
Ni accumulation and Ni phytoextraction efficiency in the studied ALYSSUM species. A. malacitanum was the only species in which a significantly negative effect of these treatments was observed (in Ni uptake). A slightly positive response to promalin treatment was observed in the
biomass production and Ni phytoextraction efficiency of A. corsicum. Although this effect was not significant it does indicate a potential application of these approaches to improve phytoextraction ability. Further studies will be needed to identify the most adequate phytohormone treatment
as well as the appropriate concentrations and application times.
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Document Type: Research Article
Instituto de Investigacións Agrobiolóxicas de Galicia (IIAG), Consejo Superior de Investigaciones Científicas (CSIC), Santiago de Compostela, Spain
Dept. of Civil and Environmental Engineering,University of Maryland, College Park,Maryland, USA
United States Department of Agriculture-Agricultural Research Service,Environmental Management and Byproduct Utilization Laboratory, Beltsville,Maryland, USA
Publication date: April 1, 2013