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Effects of a native parasitic plant on an exotic invader decrease with increasing host age.

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Summary
This summary is machine-generated.

Parasitic plant Cuscuta australis harms Bidens pilosa, but younger plants suffer more. This suggests C. australis is a viable biocontrol agent only for young B. pilosa, impacting plant defenses and growth.

Keywords:
Defencedeleterious effectgrowthinvasive plantparasitic plant

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Area of Science:

  • Plant-parasite interactions
  • Biological control
  • Plant physiology

Background:

  • Understanding host-parasite dynamics is key for biological control.
  • Ontogenetic shifts in hosts can alter plant-parasite interactions.

Purpose of the Study:

  • Investigate how host plant age affects Bidens pilosa response to Cuscuta australis infection.
  • Assess changes in growth, photosynthesis, and chemical defenses.

Main Methods:

  • Comparative analysis of infected and non-infected B. pilosa across different age groups.
  • Measurement of biomass, net photosynthetic rates, and concentrations of phenolics, flavonoids, and saponins.

Main Results:

  • Cuscuta australis infection reduced B. pilosa biomass and photosynthesis.
  • Deleterious effects were less severe in older B. pilosa.
  • Parasite infection decreased chemical defenses in younger hosts but not older ones.

Conclusions:

  • Younger B. pilosa plants experience more severe damage and have reduced recovery potential from C. australis infection.
  • Cuscuta australis shows potential as a biocontrol agent specifically for younger B. pilosa.
  • Host age is a critical factor modulating plant responses to parasitic infection.