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Effects of externally supplied protein on root morphology and biomass allocation in Arabidopsis

Lonhienne, T. G. A. and Trusov, Y. and Young, A. and Rentsch, D. and Näsholm, T. and Schmidt, S. and Paungfoo-Lonhienne, C. (2014) Effects of externally supplied protein on root morphology and biomass allocation in Arabidopsis. Scientific Reports, 4 . ISSN 20452322

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Article Link(s): http://dx.doi.org10.1038/srep05055

Abstract

Growth, morphogenesis and function of roots are influenced by the concentration and form of nutrients present in soils, including low molecular mass inorganic N (IN, ammonium, nitrate) and organic N (ON, e.g. amino acids). Proteins, ON of high molecular mass, are prevalent in soils but their possible effects on roots have received little attention. Here, we investigated how externally supplied protein of a size typical of soluble soil proteins influences root development of axenically grown Arabidopsis. Addition of low to intermediate concentrations of protein (bovine serum albumen, BSA) to IN-replete growth medium increased root dry weight, root length and thickness, and root hair length. Supply of higher BSA concentrations inhibited root development. These effects were independent of total N concentrations in the growth medium. The possible involvement of phytohormones was investigated using Arabidopsis with defective auxin (tir1-1 and axr2-1) and ethylene (ein2-1) responses. That no phenotype was observed suggests a signalling pathway is operating independent of auxin and ethylene responses. This study expands the knowledge on N form-explicit responses to demonstrate that ON of high molecular mass elicits specific responses.

Item Type:Article
Business groups:Horticulture and Forestry Science
Additional Information:Correspondence Address: Paungfoo-Lonhienne, C.; School of Agriculture and Food Sciences, University of Queensland, St. Lucia, QLD, 4072, Australia; email: chanyarat@uq.edu.au
Subjects:Agriculture > Agriculture (General) > Soils. Soil science > Soil and crops. Soil-plant relationships. Soil productivity
Science > Botany
Science > Botany > Genetics
Deposited On:19 Aug 2014 04:35
Last Modified:19 Aug 2014 04:35

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