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

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Lonhienne, T. G. A., Trusov, Y., Young, A., Rentsch, D., Näsholm, T., 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: 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
Live Archive:19 Aug 2014 04:35
Last Modified:03 Sep 2021 16:49

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