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

Lonhienne, Thierry G. A. and Trusov, Yuri and Young, Anthony and Rentsch, Doris and Nasholm, Torgny and Schmidt, Susanne and Paungfoo-Lonhienne, Chanyarat (2014) Effects of externally supplied protein on root morphology and biomass allocation in Arabidopsis. Scientific Reports, 4.

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Article Number 5055. Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 02 Feb 2017 00:29
Last Modified: 06 Feb 2017 06:14
Uncontrolled Keywords: Arabidopsis; root morphology; biomass allocation; protein
Fields of Research : 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
Identification Number or DOI: 10.1038/srep05055
URI: http://eprints.usq.edu.au/id/eprint/30454

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