THE DEVELOPMENT OF MYCORRHIZAL ROOT SYSTEMS IN TRIFOLIUM SUBTERRANEUM L. GROWTH OF ROOTS AND THE UNIFORMITY OF SPATIAL DISTRIBUTION OF MYCORRHIZAL INFECTION UNITS IN YOUNG PLANTS

S. E. SMITH*, M. TESTER, N. A. WALKER

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The development of young mycorrhizal root systems (up to 28 d) has been studied by growing Trifolium subterraneum L. in soil/sand mixtures with mycorrhizal inoculum mixed throughout the pots. Rates of initiation and of apical extension of main and first‐ and second‐order lateral roots were calculated by fitting spline functions to data collected from daily harvests. The average instantaneous rates of apical extension were found to be about 0.77, 0.2 and 0.06 cm d−1 respectively. These values were used, together with the size and distance from the root apex of the most apical mycorrhizal infection unit, to calculate the frequency of mycorrhizal infection close to the root apex (At) at 16 d. Values of At were found to be similar to average values for the whole main or lateral root system (A). We used plots of the size of infection units and their distances from the root apex, together with values of average rate of extension of roots (v) and rate of growth of infection units (B), to calculate the distances between entry points and the root apices at the time the entry points were formed. The results indicate that infection can occur not only immediately behind the root apex, but also to considerable distances (up to 55 mm) behind the apex in 16‐d‐old plants.

Original languageEnglish (US)
Pages (from-to)117-131
Number of pages15
JournalNew Phytologist
Volume103
Issue number1
DOIs
StatePublished - Jan 1 1986
Externally publishedYes

Keywords

  • Vesicular‐arbuscular
  • apical extension
  • entry points
  • lateral roots
  • modelling

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Fingerprint Dive into the research topics of 'THE DEVELOPMENT OF MYCORRHIZAL ROOT SYSTEMS IN TRIFOLIUM SUBTERRANEUM L. GROWTH OF ROOTS AND THE UNIFORMITY OF SPATIAL DISTRIBUTION OF MYCORRHIZAL INFECTION UNITS IN YOUNG PLANTS'. Together they form a unique fingerprint.

Cite this