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Role of Phytoalexins in Plant Disease Resistance Int.J.Curr.Microbiol.App.Sci (2017) 6(1): 125-129 International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 6 Number 1 (2017) pp. 125-129 Journal homepage: http://www.ijcmas.com Review Article http://dx.doi.org/10.20546/ijcmas.2017.601.016 Role of Phytoalexins in Plant Disease Resistance Roop Singh1* and Kuldeep Singh Chandrawat2 1Department of Plant Pathology, Rajasthan College of Agriculture, MPUAT, Udaipur (RAJ) 313001, India 2Department of Plant Breeding and Genetics, Rajasthan College of Agriculture, MPUAT, Udaipur (RAJ) 313001, India *Corresponding author ABSTRACT K e yw or ds Phytoalexins are low molecular weight antimicrobial compounds that are Phytoalexins, produced by plants as a response to biotic and abiotic stresses. The rapidity Plant Disease, and extent of their accumulation is determined by their release of immediate de novo synthesis precursors from conjugates or de novo synthesis, as well as detoxification as a result of plant or microbial enzymes. The rapidity of phytoalexin accumulation Article Info is associated with resistance in plants to diseases caused by fungi and bacteria, Accepted: although the genetic information for phytoalexin synthesis is found in 12 December 2016 Available Online: susceptible and resistant plants. Phytoalexins are only one component of the 10 January 2017 complex mechanisms for disease resistance in plants. Introduction Antimicrobial compounds from plants are appreciable amounts in plants only after broadly classified into two categories: stimulation by various types of phytoantipicins and phytoalexins (Mansfield, phytopathogenic microorganisms or by 1999). Phytoanticipins; Phytoanticipins are chemical and mechanical injury. It was described as "low molecular weight, proposed in 1940 by Muller and Borger in the antimicrobial compounds that are present in study of the interaction between potato and plants before challenge by micro-organisms, Phytophthora infestans. Most known or are produced after infection solely, from phytoalexins are toxic to and inhibit the pre-existing precursors". They include growth of fungi pathogenic to plants, but primarily the saponins, avenacin and some are also toxic to bacteria, nematodes, tomatine. One saponin, avenacin A-1, is and other organisms. More than 350 localized in the epidermis of oat roots and phytoalexins have been chemically another saponin, a-tomatine, is produced in characterized from approximately 30 plant tomato and has antimicrobial activity against families. The greatest number 130 have been many fungi. Phytoalexins; Phytoalexins are characterized from the Leguminosae (Joseph, toxic antimicrobial substances produced in 1995). The chemical structures of 125 Int.J.Curr.Microbiol.App.Sci (2017) 6(1): 125-129 phytoalexins produced by plants of a family perception by the host initiates the chain of are usually quite similar; e.g., in most events leading to phytoalexin synthesis. legumes, phytoalexins are is oflavonoids, and Biotic elicitors may originate in the invading in the Solanaceae they are terpenoids. organism, in which case they are referred to Phytoalexins represents one component of a as "exogenous", whereas "endogenous" battery of induced defence mechanisms used elicitors are of plant origin and are generated by plants including lytic enzymes such as by the interaction between micro-organism chitinases and glucanases, oxidizing agents, and plant. Molecules with elicitor activity cell wall lignifications and a number of have been identified across a wide range of pathogenesis-related (PR) proteins and structural types including polysaccharides, transcripts of unknown functions (Dixon and glycoproteins, lipids, lipopolysaccharides, Lamb, 1990; Lamb et al.,, 1989). It is oligosaccharides and even enzymes, though important to recognize that phytoalexin their activity can be attributed to their effect accumulation may be part of a co-ordinated in releasing elicitor-active components from defence strategy, in which any one factor the cell walls of the pathogen or host may alone be unable to account for restriction (Anderson, 1989; Blein et al.,,1991; Alghisi of the potential pathogen (Mansfield, 1999). and Favaron, 1995). Abiotic elicitors form a diverse collection of molecules that are not Chemical Diversity of Phytoalexins derived from natural sources, such as the tissues of the pathogen or host. Under normal Most phytoalexins produced by the circumstances, they would not be Leguminosae belong to six isoflavonoid encountered by the plant. The group includes classes: isoflavones, isoflavanones, compounds such as fungicides; salts of heavy pterocarpans, pterocarpenes, isoflavans and metals, for example Cu2+ and Hg2+; the coumestans (Table 1). Some pterocarpan detergents, basic molecules such as phytoalexins are especially well known: polylysine and histone; reagents that are pisatin, phaseollin, glyceollin, medicarpin intercalated DNA (Darvill and Albersheim, and maackiain. Pisatin was the first 1984). Treatment of plant tissues with factors phytoalexin to be isolated and characterized that cause stress, for example repeated from garden pea, Pisum sativum freezing and thawing, wounding or exposure (Cruickshank and Perrin 1960). Besides these to UV light (Kodama et al., 1992; Mert Turk compounds, a small number of legumes also et al., 1998) can also induce phytoalexin produce non-isoflavonoid phytoalexins such synthesis. as furanoacetylenes and stilbenes (Table 1). Phytoalexin in disease resistance Elicitors of phytoalexin accumulation Phytoalexins accumulate at infection sites The molecules that signal plants to begin the and they inhibit the growth of fungi and process of phytoalexin synthesis are called bacteria in vitro therefore, it is logical to elicitors. Elicitors of biotic origin may be consider them as possible plant-defence involved in the interaction of plants and compounds against diseases caused by fungi potential pathogens, whereas abiotic elicitors and bacteria. Phytoalexins are considerably are not involved in normal host-pathogen less toxic than chemical fungicides. interactions (Darvill and Albersheim, 1984). Phytoalexin fungitoxicity is clearly evidenced by the inhibition of germ-tube elongation, In natural conditions, the stimulus is provided radial mycelial growth and mycelia dry by the presence of the micro-organism and its weight increase, as best illustrated by the 126 Int.J.Curr.Microbiol.App.Sci (2017) 6(1): 125-129 action of resveratrol on B. cinerea, the causal anhydro-β-rotunol and solavetivone) on three agent for gray mold in grapevine. Phytophthora species resulted in loss of Phytoalexins may also exert some effects on motility of the zoospores, rounding-up of the the cytological, morphological and cells associated with some level of swelling, physiological characteristics of fungal cells. cytoplasmic granulation and bursting of the The activity of four phytoalexins from the cell membrane (Harris and Dannis, 1997). Solanaceae family (rishitin, phytuberin, Table.1 Phytoalexins from different plant families S. No. Plant Families Types of Phytoalexins 1. Amaryllidaceae Flavans Indole phytoalexins/camalexin 2. Brassicaceae Sulfur-containing phytoalexins/brassinin 3. Chenopodiaceae Flavanones/betagarin Isoflavones/betavulgarin 4. Compositae Polyacetylenes/safynol 5. Convolvulaceae Furanosesquiterpenes/Ipomeamarone 6. Euphorbiaceae Diterpenes/casbene Diterpenoids: Momilactones; Oryzalexins; Zealexins; Phytocassanes; Kauralexins Poaceae 7. Deoxyanthocyanidins/luteolinidin and apigeninidin Flavanones/sakuranetin Phenylamides Isoflavones, Isoflavanones, Isoflavans, Coumestans Leguminosae 8. Pterocarpans/pisatin, phaseollin, glyceollin and maiackiain Furanoacetylenes/wyerone Stilbenes/resveratrol Pterocarpens 9. Linaceae Phenylpropanoids/coniferyl alcohol 10. Malvaceae Terpenoids naphtaldehydes/gossypol 11. Moraceae Furanopterocarpans/moracins A-H 12. Orchidaceae Dihydrophenanthrenes/loroglossol 13. Rutaceae Methylated phenolic compounds/xanthoxylin Polyacetylenes/falcarinol Umbelliferae 14. Phenolics: xanthotoxin 6-methoxymellein 15. Vitaceae Stilbenes/resveratrol Rosaceae Biphenyls/auarperin 16. Dibenzofurans/cotonefurans Phenylpropanoid related compounds Steroid glycoalkaloids Solanaceae 17. Norsequi and sesquiterpenoids Coumarins Polyacetylenic derivatives 127 Int.J.Curr.Microbiol.App.Sci (2017) 6(1): 125-129 Concerning the accumulation of pisatin in Enterococcus, Pseudomonas and Neisseria. It pea and phaseollin in green bean, it was is thus clear that phytoalexins exhibit toxicity apparent that the phytoalexins accumulated to across much of the biological spectrum, fungitoxic concentrations not only in prokaryotic and eukaryotic. inoculum droplets placed on opened pea or bean pods but also in the tissues immediately In conclusion, phytoalexins are only one below the inoculum droplets (Cruickshank component of the complex mechanisms for and Perrin, 1968). Asymetric growth of the disease resistance in plants. Studies on germ tube resulting in the production of phytoalexins alone have contributed a great “curved-germ tubes” has also been observed deal to plant biochemistry and molecular in B. cinerea conidia treated with sub-lethal biology. Phytoalexin production and doses of resveratrol. This cytological accumulation occur in healthy plant cells abnormality suggests that stilbenic surrounding wounded or infected cells and compounds may interact with tubulin are stimulated by alarm substances produced polymerization, the mode of action of many and released by the
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