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Do high-tannin leaves require more roots?

D G Fischer1, S C Hart, B J Rehill

  • 1School of Forestry, Northern Arizona University, Flagstaff, AZ 86011, USA. fischerd@evergreen.edu

Oecologia
|June 29, 2006
PubMed
Summary
This summary is machine-generated.

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Plants may grow more fine roots when soil nitrogen cycling slows due to leaf tannins. This study found a link between fine-root growth, plant genetics, and leaf chemistry in Populus species.

Area of Science:

  • Plant Ecology
  • Soil Science
  • Genetics

Background:

  • Foliar condensed tannins can slow soil nitrogen (N) cycling.
  • Plants may compensate for reduced N availability by increasing fine-root growth.

Purpose of the Study:

  • To investigate the relationship between fine-root production, plant genetics, and leaf secondary compounds in Populus species.
  • To determine if genetic factors influence compensatory root growth in response to soil N changes.

Main Methods:

  • Measured fine-root (<2 mm) production and leaf chemistry in Populus angustifolia, P. fremontii, and their hybrids.
  • Utilized an experimental genetic gradient with genetically controlled leaf litter tannin concentrations.
  • Assessed tree genetic composition using genetic markers.

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Main Results:

  • Fine-root production showed a strong correlation with leaf tannin concentrations.
  • Fine-root production was also highly correlated with individual tree genetic composition.
  • Results suggest a genetic basis for compensatory root growth.

Conclusions:

  • Genes for tannin production may link foliar chemistry to root growth.
  • This linkage can create feedbacks between aboveground and belowground plant processes.
  • Genetic control over root responses to soil conditions is likely significant.