Rapid response to shoot removal by the invasive wetland plant, alligator weed (Alternanthera philoxeroides)

John R.U. Wilson, Alice Yeates, Shon Schooler, Michael H. Julien

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Resprouting plants provide an interesting test to the generality of plant allometric relationships. The ability to rapidly resprout after disturbance also makes weeds more difficult to control. We performed a glasshouse experiment to investigate regrowth of an invasive plant (alligator weed, Alternanthera philoxeroides (Martius) Grisebach) after an experimental mowing treatment. Nutrient levels and biomass accumulation were measured weekly for five weeks, and carbohydrate levels were measured when regrowth was quickest. After five weeks, the biomass of treatment plants was similar to that expected from a growth curve fitted to undamaged control plants. Treatment plants, however, had a higher below-ground biomass, and a higher ratio of stem to leaf biomass than expected. The regrowing material also had a lower nutrient concentration. Both the rapid regrowth and the change in morphology make the mechanical control of alligator weed more difficult, and may, in part, be responsible for the invasiveness of this plant.

Original languageEnglish (US)
Pages (from-to)20-25
Number of pages6
JournalEnvironmental and Experimental Botany
Volume60
Issue number1
DOIs
StatePublished - May 2007

Keywords

  • Resprouting
  • Root:shoot ratio
  • Top-kill

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