Contrasting the morphology, anatomy and fungal colonization of new pioneer and fibrous roots

Marcin Zadworny, David Eissenstat

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Not all roots born as first-order branches are the same and this has important consequences for overall function. We hypothesized that, compared with fibrous roots, pioneer roots are built to live longer at the expense of absorptive capacity. We tested this hypothesis by investigating pioneer and fibrous roots in their first 14d of life in the arbuscular mycorrhizal tree species: Acer negundo, Acer saccharum, Juglans nigra, Liriodendron tulipifera and Populus tremuloides. Root observations were made with root-access boxes that allowed roots to be sampled at known ages in field-grown trees. Compared to fibrous roots, pioneer roots had larger diameter, lower specific root length, greater average length and a lack of mycorrhizal or nonmycorrhizal fungal colonization. Pioneer roots <14d old had more layers of hypodermis with a lower percentage of putative passage cells and more protoxylem groups than similar age fibrous roots. Our results suggest that pioneer roots are constructed for defense against biotic and abiotic challenges, exploration of soil distal to the stem, high fibrous root branching and secondary development with high axial hydraulic conductivity at the expense of mycorrhizal colonization and high absorptive capacity for water and nutrients.

Original languageEnglish (US)
Pages (from-to)213-221
Number of pages9
JournalNew Phytologist
Volume190
Issue number1
DOIs
StatePublished - Apr 1 2011

Fingerprint

Acer
fibrous roots
Liriodendron
Anatomy
Juglans
Populus
Subcutaneous Tissue
Soil
Age Groups
Food
Water
Acer negundo
Juglans nigra
Liriodendron tulipifera
Acer saccharum
Populus tremuloides
hydraulic conductivity
branches
branching

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science

Cite this

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abstract = "Not all roots born as first-order branches are the same and this has important consequences for overall function. We hypothesized that, compared with fibrous roots, pioneer roots are built to live longer at the expense of absorptive capacity. We tested this hypothesis by investigating pioneer and fibrous roots in their first 14d of life in the arbuscular mycorrhizal tree species: Acer negundo, Acer saccharum, Juglans nigra, Liriodendron tulipifera and Populus tremuloides. Root observations were made with root-access boxes that allowed roots to be sampled at known ages in field-grown trees. Compared to fibrous roots, pioneer roots had larger diameter, lower specific root length, greater average length and a lack of mycorrhizal or nonmycorrhizal fungal colonization. Pioneer roots <14d old had more layers of hypodermis with a lower percentage of putative passage cells and more protoxylem groups than similar age fibrous roots. Our results suggest that pioneer roots are constructed for defense against biotic and abiotic challenges, exploration of soil distal to the stem, high fibrous root branching and secondary development with high axial hydraulic conductivity at the expense of mycorrhizal colonization and high absorptive capacity for water and nutrients.",
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Contrasting the morphology, anatomy and fungal colonization of new pioneer and fibrous roots. / Zadworny, Marcin; Eissenstat, David.

In: New Phytologist, Vol. 190, No. 1, 01.04.2011, p. 213-221.

Research output: Contribution to journalArticle

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