Tannins in plant–herbivore interactions

Influence of plant resistance traits in selectiveness and species strength in a tropical plant‐herbivore network

“…Traditionally, ecological studies have concentrated on total condensed tannins (CTs) or on total tannins (measuring the PCC of plant extract); however, gallotannins (GTs) and CTs generally have a higher PCC than ellagitannins (ETs) ( Kilkowski and Gross, 1999 ;Barbehenn and Constabel, 2011 ). We evaluated the oxidative capacity in an eff ort to explore the role of oxidized phenolics in the plant-herbivore interaction.…”

“…Trichomes constrain the movement of herbivores and aff ect larval consumption and survival ( Zalucki et al, 2002 ;Handley et al, 2005 ;Tian et al, 2012 ) and oft en exudate toxic chemicals ( Lin et al, 1987 ). Phenolic compounds, and in particular tannins, are the most abundant specialized metabolites in plants ( Barbehenn and Constabel, 2011 ). Th e resistance value of tannins results from their oxidative activation inside alkaline insect guts ( Ahmad, 1992 ;Appel, 1993 ;Summers and Felton, 1994 ), resulting in cytotoxic effects in their tissues ( Felton et al, 1992 ;Hagerman et al, 2003 ;Barbehenn and Constabel, 2011 ).…”

“…Phenolic compounds, and in particular tannins, are the most abundant specialized metabolites in plants ( Barbehenn and Constabel, 2011 ). Th e resistance value of tannins results from their oxidative activation inside alkaline insect guts ( Ahmad, 1992 ;Appel, 1993 ;Summers and Felton, 1994 ), resulting in cytotoxic effects in their tissues ( Felton et al, 1992 ;Hagerman et al, 2003 ;Barbehenn and Constabel, 2011 ). Specifi cally, the oxidative stress generated by hydrogen peroxide production in the lumen causes lesions in the midgut epithelium ( Barbehenn et al, 2005 ).…”

Genotypic variability in Populus tremula L. affects how anthropogenic nitrogen enrichment influences litter decomposition

“…Also, for the related European aspen, Populus tremula L., a keystone species in the boreal region (Siitonen and Martikainen 1994;Kouki et al 2004), substantial genotypic variations in tannin concentrations have been reported (Robinson et al 2012;Bandau et al 2015). Tannins have long been recognized for their potential role in defending plants against generalist herbivores and pathogens (Kraus et al 2003;Holeski et al 2009;Barbehenn and Constabel 2011;Robinson et al 2012), but they are increasingly also acknowledged to influence soil processes, such as litter decomposition (Kraus et al 2003;Madritch et al 2006;Schweitzer et al 2008;Madritch and Lindroth 2015), through their resistance to degradation by soil microbes, as well as their ability to bind and stabilize plant proteins or microbial enzymes (Benoit and Starkey 1968;Fierer et al 2001;Kraus et al 2003 and references therein;Joanisse et al 2007). …”

Malpighia emarginata DC. bagasse acetone extract: Phenolic compounds and their effecton Spodoptera frugiperda(J.E. Smith) (Lepidoptera: Noctuidae)

“…This hypothesis is supported by the fact that the phenolic compounds identified in ABF, such as gallic acid and catechin, affect growth and survival of herbivorous insects. Barbehenn and Constabel (2011) reported that, contrary to early theories, tannins have no direct effect on protein digestion in insect herbivores. Instead, they concluded that their toxicity is derived from reactive oxygen species such as semiquinone radicals and quinones, which are formed by oxidation of tannins in insects' high intestinal pH.…”