Effects of simulated and insect herbivory on nitrogen and protein precipitable phenolic concentrations of two legumes

[摘要] Protein-precipitating polyphenolics (PPPs) serve as a plant defense against herbivory, increasing with stress. We studied how varying intensities of simulated and Melanoplus differentialis herbivory affected (1) PPP concentration; (2) protein bound by PPP (PB); and (3) N concentration of panicled tick-clover (Desmodium paniculatum; PTC) and sericea lespedeza (Lespedeza cuneata; SL) leaf regrowth. Leaves of PTC that were submitted to simulated herbivory had lesser (p ≤ .05 for all significant differences) PPP concentration than the control for most treatments. For PTC, PPP concentration decreased with increasing herbivory intensity for both herbivory types. For SL, PPP was similar between herbivory types for Harvest 1 but not for 2, decreasing as herbivory intensity increased for both herbivory types. Simulated herbivory resulted in lower PB concentrations for PTC and SL compared to the grasshopper herbivory. Nitrogen concentration was similar for PTC and SL between herbivory types but variable among degree of herbivory. Herbivory type affects PPP.

[学科分类] 纳米科学和纳米技术

[关键词] Condensed tannins;grasshopper;phenolics;Lespedeza cuneata;Desmodium paniculatum