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Collection and Long-Term Maintenance of Leaf-Cutting Ants Atta in Laboratory Conditions
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Damage to leaf veins suppresses root foraging precision.

Akira Yamawo1, Haruna Ohsaki1, James F Cahill2

  • 1Department of Biology, Faculty of Agriculture and Life Science, Hirosaki University, 1 Bunkyo-cho, Hirosaki, 036-8560, Japan.

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|August 10, 2019
PubMed
Summary
This summary is machine-generated.

Plant foraging precision, the ability to direct root growth towards nutrient-rich soil patches, depends on intact leaf veins for shoot-root signaling. Damage to leaf veins, but not leaf tissue, disrupts this crucial plant behavior.

Keywords:
PlantaginaceaeRosaceaelong-distance signalingplant behaviorroot allocationsimulated herbivorysoil nutrient

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Area of Science:

  • Plant physiology
  • Ecology
  • Plant-soil interactions

Background:

  • Plants exhibit foraging precision, increasing root growth in nutrient-rich soil patches.
  • This phenomenon is thought to involve shoot-root signaling, potentially mediated by leaf veins.
  • The precise physiological mechanisms underlying foraging precision remain unclear.

Purpose of the Study:

  • To investigate the role of leaf veins in plant foraging precision.
  • To test the hypothesis that damage to leaf veins impairs shoot-root signaling and reduces foraging precision.
  • To determine if mesophyll damage has a similar effect on foraging precision.

Main Methods:

  • Two plant species, Plantago asiatica and Prunus jamasakura, were subjected to leaf damage treatments.
  • Treatments included damage to main leaf veins or mesophyll tissue using a hole punch.
  • Root biomass allocation in response to soil nutrient heterogeneity was measured after 30 days and 20 weeks.

Main Results:

  • Plants with damaged leaf mesophyll maintained foraging precision, showing greater root biomass in nutrient-rich patches.
  • Plants with damaged leaf veins lost foraging precision, exhibiting similar root biomass allocation between nutrient-rich and nutrient-poor patches.
  • These findings were consistent across both species and experimental durations.

Conclusions:

  • Leaf veins are critical for effective shoot-root signaling that mediates plant foraging precision.
  • Herbivory targeting leaf veins could significantly impact a plant's ability to exploit nutrient-rich patches.
  • Understanding these signaling pathways has implications for both natural ecosystems and agricultural systems.