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Title: Phylogenetically structured traits in root systems influence arbuscular mycorrhizal colonization in woody angiosperms

In this study, there is little quantitative information about the relationship between root traits and the extent of arbuscular mycorrhizal fungi (AMF) colonization. We expected that ancestral species with thick roots will maximize AMF habitat by maintaining similar root traits across root orders (i.e., high root trait integration), whereas more derived species are expected to display a sharp transition from acquisition to structural roots. Moreover, we hypothesized that interspecific morphological differences rather than soil conditions will be the main driver of AMF colonization We analyzed 14 root morphological and chemical traits and AMF colonization rates for the first three root orders of 34 temperate tree species grown in two common gardens. We also collected associated soil to measure the effect of soil conditions on AMF colonization Results Thick-root magnoliids showed less variation in root traits along root orders than more-derived angiosperm groups. Variation in stele:root diameter ratio was the best indicator of AMF colonization within and across root orders. Root functional traits rather than soil conditions largely explained the variation in AMF colonization among species. In conclusion, not only the traits of first order but the entire structuring of the root system varied among plant lineages, suggesting alternative evolutionary strategiesmore » of resource acquisition. Understanding evolutionary pathways in below ground organs could open new avenues to understand tree species influence on soil carbon and nutrient cycling.« less
 [1] ;  [1] ;  [2] ;  [1]
  1. Kent State Univ., Kent, OH (United States)
  2. Kent State Univ., Kent, OH (United States); The Holden Arboretum, Kirtland, OH (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Plant and Soil
Additional Journal Information:
Journal Name: Plant and Soil; Journal ID: ISSN 0032-079X
Research Org:
Kent State Univ., Kent, OH (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
59 BASIC BIOLOGICAL SCIENCES; root functional traits; angiosperm evolution; arbuscular mycorrhizal fungi; root order integration; cortex area; nutrient uptake strategies
OSTI Identifier: