Role of catalase, H2O2 and phenolics in resistance of pigeonpea towards Helicoverpa armigera (Hubner)

Evaluation of biochemical defense response to Spodoptera litura infestation in cotton (Gossypium hirsutum L.) genotypes

“…In our study, it was observed that S. litura in uenced a marked increase in the accumulation of phenolic compounds in plants exposed to herbivory. Kaur et al (2014) observed similar ndings in infested pigeon pea genotypes. Phenolic compounds with antioxidant potential reduce highly reactive oxygen radicles (Ashraf, 2009) and are toxic to insects (Bhonwong et al, 2009;Walling, 2000).…”

“…Higher levels of H 2 O 2 in plants considered to be damaging for insect gut through oxidative damage in infested plants (Orozco-Cardenas and Ryan, 1999). Kaur et al (2014) reported a negative correlation (r = -0.73) regarding CAT activity and H 2 O 2 contents in infested leaves, indicating that the higher CAT activity decreases H 2 O 2 accumulation as CAT transforms H 2 O 2 into H 2 O and O 2 .…”

The effect of mealybug Pseudococcus longispinus (Targioni Tozzetti) infestation of different density on physiological responses of Phalaenopsis × hybridum ‘Innocence’

“…In addition, the increase in phenolics could lead to the substrate-induced higher activity of POD. Taggar et al (2012) and Kaur et al (2014) observed significant and positive correlation between POD and total phenols during insect–plant interactions. Our results are in agreement with the study of Golan et al (2013).…”

“…An increase in peroxidase activity due to aphids feeding was previously reported by Mohase & van der Westhuizen (2002), Moloi & van der Westhuizen (2006), He et al (2011), Mai et al (2013). Kaur et al (2014) suggest that the strength in induction in enzymatic activities varied among genotypes. This might be due to differences in sensitive up-regulation response of genotypes against pest insects (War et al , 2012).…”

Genome-wide association study reveals a set of genes associated with resistance to the Mediterranean corn borer (Sesamia nonagrioides L.) in a maize diversity panel

“…In addition, it has been described to play a role in cell wall stiffening and mediating abiotic and biotic stresses [ 132 ]. The candidate adjacent gene to the significant SNP associated to KR on chromosome 7 encodes a Catalase//L-ascorbate peroxidase, they are two major hydrogen peroxide-detoxifying enzymes whose activity is very important in the reduction of the oxidative stress caused by H 2 O 2 [ 133 , 134 ], and the importance of these detoxifying enzymes in resistance to insect attack has been recently reported [ 135 ].…”