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Research Article

Geotropic Lateral Roots of Container-grown Longleaf Pine Seedlings

David B South, Jason Shelton and Scott A Enebak
Native Plants Journal, September 2001, 2 (2) 126-130; DOI: https://doi.org/10.3368/npj.2.2.126
David B South
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Jason Shelton
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Scott A Enebak
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Abstract

More than 95% of container-grown longleaf pine (Pinus palustris P. Mill.) seedlings had roots growing downward vertically (geotropically) when examined 7 to 8 mo after transplanting into sand. Geotropic roots were rarely the original taproot (< 0.5%) but were usually adventitious lateral roots that had formed about the callus tissue. Air-pruning in the nursery results in callus formation at the end of the taproot and typically, 1 or more adventitious roots emerge just above the callus tip. Although many first-order lateral roots were deflected downward by container walls, few exhibited positive geotropic growth after transplanting. Most grew in directions other than straight down. In this study, about 4% of the seedlings lacked geotropic roots. Longleaf pines with a long taproot or sinker roots are less susceptible to toppling at a young age than are trees without vertical roots.

  • Pinus palustris
  • geotropism
  • taproot
  • container-grown
  • root growth
  • toppling
NOMENCLATURE
  • ITIS (2001)
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Native Plants Journal: 2 (2)
Native Plants Journal
Vol. 2, Issue 2
21 Sep 2001
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Geotropic Lateral Roots of Container-grown Longleaf Pine Seedlings
David B South, Jason Shelton, Scott A Enebak
Native Plants Journal Sep 2001, 2 (2) 126-130; DOI: 10.3368/npj.2.2.126

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Geotropic Lateral Roots of Container-grown Longleaf Pine Seedlings
David B South, Jason Shelton, Scott A Enebak
Native Plants Journal Sep 2001, 2 (2) 126-130; DOI: 10.3368/npj.2.2.126
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Keywords

  • Pinus palustris
  • geotropism
  • taproot
  • container-grown
  • root growth
  • toppling
  • ITIS (2001)
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