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Plant Defence Against Herbivory and Insect Adaptations

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Plant Defence Against Herbivory and Insect Adaptations Review SPECIAL ISSUE: Using Non-Model Systems to Explore Plant-Pollinator and Plant-Herbivore Interactions Downloaded from https://academic.oup.com/aobpla/article-abstract/10/4/ply037/5036447 by University of Bologna user on 09 April 2019 Plant defence against herbivory and insect adaptations Abdul Rasheed War1*, Gaurav Kumar Taggar2, Barkat Hussain3, Monica Sachdeva Taggar4, Ramakrishnan M. Nair1 and Hari C. Sharma5* 1World Vegetable Center, South Asia, Hyderabad 502324, Andhra Pradesh, India 2Department of Plant Breeding & Genetics, Punjab Agricultural University, Ludhiana 141004, Punjab, India 3Division of Entomology, SKUAST-K, Shalimar 190001, Srinagar, Jammu and Kashmir, India 4School of Renewable Energy Engineering, Punjab Agricultural University, Ludhiana 141004, Punjab, India 5YSP University of Horticulture and Forestry, Nauni 173230, Solan, Himachal Pradesh, India Received: 10 November 2017 Editorial decision: 31 May 2018 Accepted: 9 June 2018 Published: 12 June 2018 Guest Editor: Rupesh Kariyat Citation: War AR, Taggar GK, Hussain B, Taggar MS, Nair RM, Sharma HC. 2018. Plant defence against herbivory and insect adaptations. AoB PLANTS 10: ply037; doi: 10.1093/aobpla/ply037 Abstract. There is always a silent war between plants and herbivorous insects that we are rarely privy to. In this silent war, chemicals act as both weapons and messengers. Insect–plant co-evolution is going on for millions of years. Plants always look for new strategies to avoid insect pests and insects, in turn, are always ready to develop counter-adaptations. This intricate interaction has led to the development of a number of plant defensive traits and the counter-adaptive features in insects as well. Both plants and insects have developed morphological and bio- chemical defensive traits to dodge each other’s strategies. However, biochemical interactions are considered more important and effective than morphological ones because of their dynamic nature. Some of the plant defensive traits evolved during this evolution include toxic furanocoumarins, toxic amino acids, trichomes, lignin and latex. Since there is an increasing focus on improving crop production through safe and sustainable means by reducing the reliance on pesticides, it is highly important to understand the plant defensive traits against insect herbivory. It is equally important to understand the adaptations by insect pests to these defensive traits in order to develop and deploy management strategies to outsmart the insect pests. Here we discuss the plant defence traits against insect herbivory, their induction by elicitors and/or insect damage, and the counter-adaptation by insect pests. Keywords: Adaptations; induced resistance; insect pests; plant secondary metabolites; plant volatiles. Introduction plants have developed an array of defensive strategies (Zhao et al. 2009; Karban 2011; War et al. 2012) by produc- Plants and insects have co-evolved continuously since ing various morphological and biochemical defences that the first appearance of phytophagous insects in the his- restrict the insect pests (Fig. 1; Howe and Jander 2008; War tory of life. Insect herbivory forms a critical component in et al. 2012). The morphological defensive responses include insect–plant co-evolution (Howe and Jander 2008; Zhao increase in the trichomes, sclerophylly, latex deposition, et al. 2009; Karban 2011). To avoid damage by insect pests, *Corresponding author’s e-mail address: [email protected]; [email protected]; [email protected] © The Author(s) 2018. Published by Oxford University Press on behalf of the Annals of Botany Company. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/ licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. AoB PLANTS https://academic.oup.com/aobpla © The Author(s) 2018 1 War et al. – Insect plant co-evolution etc. (Dalin and Björkman 2003; War et al. 2013a, b) and the to their offspring as reported in wild radish, Raphanus biochemical traits include various toxic secondary metab- raphanistrum infested by Pieris rapae (Agrawal 2002). olites produced in plants on account of insect herbivory The transgenerational effect of induced resistance (Karban 2011; Taggar et al. 2012; Holopainen and Blande makes plants more vigorous and reduces insect infest- 2013; War et al. 2013b; Kaur et al. 2015). ation in progeny (Agrawal 2002). However, insects pre- Plant defence may directly affect insect growth and cisely adapt to the plant defensive traits that allow them Downloaded from https://academic.oup.com/aobpla/article-abstract/10/4/ply037/5036447 by University of Bologna user on 09 April 2019 development through toxic secondary metabolites or to feed successfully on the otherwise hostile and unpre- indirectly by recruiting the natural enemies of the insect dictable host (Zhu-Salzman et al. 2003; Ahn et al. 2007; pest through herbivore-induced plant volatiles (HIPVs) Després et al. 2007; War and Sharma 2014). This con- and extrafloral nectar (Arimura et al. 2009; Karban tinuous race between the two entities to outsmart each 2011; War et al. 2012). Induced resistance in response to other has led to the development of more defensive herbivore attack makes host plants phenotypically plas- traits in plants and strong counter-adaptive strategies tic and plant tissues less nutritious, thus making them a in insect pests (Zhu-Salzman et al. 2003; Sharma et al. less attractive food choice and practically unpalatable 2009; War and Sharma 2014). to insect pests (Karban 2011). Induced resistance is also sensed in the undamaged parts of the same plant and the neighbouring plants as well (Holopainen and Blande Co-evolution between plants and insects 2013). Further, induced resistance may also show a Insect–plant co-evolution has been ongoing for 400 transgenerational effect, i.e. transferring from parents million years (Labandeira 2013). In response to insect Figure 1. Plant defence against insect pests (EPF = extrafloral nectar; HIPV = herbivore induced plant volatiles; JA = jasmonic acid; SA = salicylic acid). 2 AoB PLANTS https://academic.oup.com/aobpla © The Author(s) 2018 War et al. – Insect plant co-evolution herbivory, natural selection has resulted in the evolution leaf-chewing herbivores, showed the lowest genetic cor- of morphological, behavioural and biochemical diver- relation (Leimu and Koricheva 2006). sity among plants and insect pests. The plant defensive Both morphological and biochemical defences traits confer direct resistance against insect pests and in plants are important to withstand insect attack. also provide high competitive ability in the absence of Although morphological defence is primarily used by insect pests (Agrawal et al. 2012; Hare 2012). The gen- plants against insect pests, the biochemical-based Downloaded from https://academic.oup.com/aobpla/article-abstract/10/4/ply037/5036447 by University of Bologna user on 09 April 2019 eralist and specialist insect herbivores show an evo- defence is considered more effective as it directly affects lution of some candidate genes responsible for their insect growth and development (Kariyat et al. 2013). adaptation to host plants as reported in the pea aphid, The HIPVs indirectly defend plants by recruiting the nat- Acyrthosiphon pisum (Jaquiery et al. 2012). Also, another ural enemies of the insect pests, such as parasitoids specialist insect pest, Drosophila sechellia, evolved on and predators (Arimura et al. 2009; War et al. 2011). Morinda citrifolia shows higher expression levels of Induced resistance in plants against biotic stresses is neurons ab3 and ab3B. These neurons are sensitive to attributed to the phenylpropanoid and octadecanoid hexanoate esters and 2-heptanone, respectively, and pathways mediated by salicylic acid (SA) and jasmonic enable the pest to recognize the odours from Morinda acid (JA), respectively (Zhao et al. 2009; Scott et al. 2010; fruit (Ibba et al. 2010). Similarly, grubs of the bruchid He et al. 2011). These pathways produce a number of beetle Caryedes brasiliensis feed on the seeds of Dioclea plant defensive secondary metabolites in intermediate megacarpa, which contain a toxic non-protein amino steps, which affect insect growth and development and acid L-canavanine. A modified tRNA synthetase in these also release volatiles that attracts the insect’s natural grubs distinguishes between L-canavanine and arginine enemies (Howe and Jander 2008; He et al. 2011). (Rosenthal et al. 1976). Eco-genomic tools have been implicated in studying the genetic basis of plant defen- sive traits in many plant systems (Schranz et al. 2009). Plant defence elicitors They can further be used to study the constitutive and Plants recognize cues in the insect’s oral secretion/saliva inducible defences by focusing on the polymorphic traits and in the ovipositional fluid (Schmelz et al. 2006; Alborn or follow the transgenic approaches to study the gene et al. 2007; Wu et al. 2007; Howe and Jander 2008). Insect function and ecological consequences (Schranz et al. oral secretions contain specific elicitors such as fatty 2009). acid conjugates (FACs), which stimulate plant defence. The first plant defence elicitor identified from the oral secretions of beet armyworm, Spodoptera exigua, was Plant defence against insect herbivory volicitin (N-(17-hydroxylinolenoyl)-L-glutamine), whose Host plant resistance is an important
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