Effect of Methyl Jasmonate on Phytoalexins Biosynthesis and Induced Disease Resistance toFusarium oxysporum f. sp. Vasinfectumin Cotton (Gossypium hirsutumL.)

Abstract

The effect of methyl jasmonate (MeJA) sprayed on cotton healthy leaves was evaluated in terms of inherent bioactive chemicals induction. The total phenolic content significantly increased after MeJA 5.0 mM treatments compared to the other tested concentrations (0; 2.5; 10; 15; 20 mM). Among the eleven phenolic compounds which were found except for ferulic acid, gossypetin, gossypol, 3-p-coumaroylquinic acid, and piceatannol were identified as major phenolic constituents of cotton. Their content also significantly increased after the MeJA treatment. In addition, gossypol increased 64 times compared to the control, in the 5.0 mM MeJA treatment. Furthermore, cichoric acid, chlorogenic acid, and pterostilbene are synthesizedde novoin leaves of MeJA-treated plant. Treatment of cotton leaves with MeJA 5.0 mM followed 72 h of incubation hampered the expression ofFusariumwilt caused byFusarium oxysporium f. sp. vasinfectum(FOV). MeJA efficiency was concentration and incubation time dependent. Disease severity on MeJA-treated leaves was significantly lower as compared to the control. Therefore, the high content of gossypetin, gossypol, 3-p-coumaroylquinic acid, ferulic acid, and piceatannol and the presence of cichoric acid, chlorogenic acid, and pterostilbene in plants treated with MeJA, contrary to the control, are essential to equip the cotton compounds with defences or phytoalexins against FOV.

Variation des Composés Phénoliques suite à l’Elicitation du Cotonnier suivie d’Inoculation à Fusarium Oxysporum F. Sp. Vasinfectum

“…Des plants de cotonniers âgés de deux mois ont été traités avec 10 mL de MeJA (5 mM), préalablement dissout dans 1% d'éthanol, complété avec une solution aqueuse de Triton X-100 (0,1%) (Konan et al, 2014). Les plants témoins de cotonnier ont été pulvérisés avec une solution d'éthanol (1%) additionnée de Triton X-100 (0,1%).…”

“…Il est à la fois une plante industrielle et une plante vivrière. Le coton représente 50% du marché des fibres textile (Konan et al, 2014). Cependant, le cotonnier est menacé par de nombreux ravageurs, des parasites et des maladies diverses qui contribuent à la réduction de la production, la qualité des fibres et des graines (Vaissayre, 1994).…”

“…Cependant, le cotonnier est menacé par de nombreux ravageurs, des parasites et des maladies diverses qui contribuent à la réduction de la production, la qualité des fibres et des graines (Vaissayre, 1994). La fusariose est l'une des principales causes de perte de production dans la culture cotonnière (Konan et al, 2014). Pour contrôler cette maladie, les producteurs ont recours à des fortes quantités de pesticides.…”

Study on the Antimicrobial Activity of C3,6- Dibenzoylated Phenyl-Thiosemicarbazone-Chitosan Derivatives

“…vasinfectum is one of the pathogens which have systemic infection, soil dissemination, stress resistance and pathogenicity. This germ is extremely difficult to control [18]. The C. gloeosporioides (Penz.)…”

Phytohormone-Induced Resistance against <i>Xanthomonas axonopodis</i> PV. <i>citri</i> in <i>Citrus aurantifolia</i>

“…Phytohormones are natural or synthetic compounds that activate chemical defense in plant [7]. Induce resistance is provoked by phytohormones such as salicylic acid (SA), jasmonic acid (JA), 3-indoleacetonitrile (IAN), nicotinic acid (NA), folic acid (FA) [8] [9] [10] [11]. Salicylic acid plays an important role in induction of plant defense against a variety of biotic and abiotic stresses through morphological, physiological and biochemical mechanisms [12] [13].…”