Growth of tree roots in hostile soil: a comparison of root growth pressures of tree seedlings with peas

Article


Azam, Gausul, Grant, Cameron D., Misra, Rabindra K., Murray, Robert S. and Nuberg, Ian K.. 2013. "Growth of tree roots in hostile soil: a comparison of root growth pressures of tree seedlings with peas." Plant and Soil: international journal on plant-soil relationships. 368 (1-2), pp. 569-580. https://doi.org/10.1007/s11104-012-1537-4
Article Title

Growth of tree roots in hostile soil: a comparison of root growth pressures of tree seedlings with peas

ERA Journal ID2642
Article CategoryArticle
AuthorsAzam, Gausul (Author), Grant, Cameron D. (Author), Misra, Rabindra K. (Author), Murray, Robert S. (Author) and Nuberg, Ian K. (Author)
Journal TitlePlant and Soil: international journal on plant-soil relationships
Journal Citation368 (1-2), pp. 569-580
Number of Pages12
Year2013
PublisherSpringer
Place of PublicationNetherlands
ISSN0032-079X
1573-5036
Digital Object Identifier (DOI)https://doi.org/10.1007/s11104-012-1537-4
Web Address (URL)http://link.springer.com/article/10.1007%2Fs11104-012-1537-4
Abstract

Background and Aims: As part of a study on growth of tree roots in hostile soil, we envisaged that establishment and survival of trees on hard, dry soil may depend on their ability to exert axial root growth pressures of similar magnitude to those of the roots of agricultural plants (with significant root thickening when roots grow across an air gap or cracks and biopores). We selected tree species originating from a range of different soil and climatic conditions to evaluate whether their relative success on harsh soil (in an evolutionary sense) might be related to the magnitude of root growth pressures they could exert, or how they performed in the very early stages of growth after germination.
Methods: We measured the maximum axial root growth force (Fmax) on single lateral root axes of 3- to 4- month old seedlings of 6 small-seeded eucalypts from 2 different habitats and 2 contrasting soil types. Root growth rate, root diameter and Fmax were also measured on the primary root axes of a large-seeded acacia and a domesticated annual (Pisum sativum) seedling for up to 10 days following germination.
Results: The lateral roots of the 6 eucalypts and the primary roots of the acacia were considerably smaller than the primary roots of P. sativum and they exerted average forces of similar magnitude to one another (0.198 to 0.312 N). The maximum axial root growth pressures were all in the range 150 to 250 kPa but E. leucoxylon, E. loxophleba and A. salicina exerted the greatest pressures among the trees, and comparable pressures to those exerted by the primary roots of 2-day-old P. sativum (211-252 kPa). Although the primary roots of acacia seedlings exerted increasing axial root growth pressures over a 10-day period following germination, the pressures were still only slightly greater than those of the domesticated plant, P. sativum. Conclusions: The lack of any very large differences in axial root growth pressures between trees and domesticated plants suggests that trees that grow well in harsh soil don't do so by exerting higher root growth pressures alone but by also exploring the network of cracks and pores more effectively than do other plants that are less successful.

Keywordsroot elongation; hard soil; root growth force; woody perennials; annual crops; Pisum sativum; eucalypt; acacia; plant evolution
ANZSRC Field of Research 2020410605. Soil physics
310899. Plant biology not elsewhere classified
300701. Agroforestry
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Byline AffiliationsUniversity of Adelaide
National Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
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