Salicylic Acid, Phosphorous Acid and Fungicide Sumi 8 Effects on Polyphenol Oxidases Activities and Cassava Resistance to Anthracnose

Gogbeu, Seu Jonathan

doi:10.11648/j.ajaf.20150303.18

Cited by 1 publication

(2 citation statements)

References 21 publications

(24 reference statements)

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“…Antioxidases such as PPO, POD and CAT play a crucial role in the phenylpropanoid pathway, some of their products are often vital defence compounds against herbivores and pathogens (Dong et al ., 2010; Jonathan Gogbeu et al ., 2015). SA can enhance the activities of these three oxidases in many plants (Valverde et al ., 2015), but the activities of POD and CAT are suppressed by SA in other plants (Mohase and van der Westhuizen, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…With regard to phytohormone-mediated resistance to phloem feeders, although JA-inducible resistance was considered to deter some chewing herbivores before (Thaler et al ., 2012; Lazebnik et al ., 2014), the current opinion is that SA-inducible resistance is involved in protection against some phloem-feeding insects via eliciting JA signalling pathway (Alba et al ., 2015; Jonathan Gogbeu et al ., 2015). For example, SA was confirmed to be necessary for resistance to Macrosiphum euphorbiae in the tomato (Bhattarai et al ., 2007).…”

Section: Introductionmentioning

confidence: 99%

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Exogenous salicylic acid improves resistance of aphid-susceptible wheat to the grain aphid, Sitobion avenae (F.) (Hemiptera: Aphididae)

Feng

Jie

Yang

et al. 2021

Bull. Entomol. Res.

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Salicylic acid (SA), a phytohormone, has been considered to be a key regulator mediating plant defence against pathogens. It is still vague how SA activates plant defence against herbivores such as chewing and sucking pests. Here, we used an aphid-susceptible wheat variety to investigate Sitobion avenae response to SA-induced wheat plants, and the effects of exogenous SA on some defence enzymes and phenolics in the plant immune system. In SA-treated wheat seedlings, intrinsic rate of natural increase (rm), fecundity and apterous rate of S. avenae were 0.25, 31.4 nymphs/female and 64.4%, respectively, and significantly lower than that in the controls (P < 0.05). Moreover, the increased activities of phenylalanine-ammonia-lyase, polyphenol oxidase (PPO) and peroxidase in the SA-induced seedlings obviously depended on the sampling time, whereas activities of catalase and 4-coumarate:CoA ligase were suppressed significantly at 24, 48 and 72 h in comparison with the control. Dynamic levels of p-coumaric acid at 96 h, caffeic acid at 24 and 72 h and chlorogenic acid at 24, 48 and 96 h in wheat plants were significantly upregulated by exogenous SA application. Nevertheless, only caffeic acid content was positively correlated with PPO activity in SA-treated wheat seedlings (P = 0.031). These findings indicate that exogenous SA significantly enhanced the defence of aphid-susceptible wheat variety against aphids by regulating the plant immune system, and may prove a potential application of SA in aphid control.

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