Hexanal Vapor Induced Resistance against Major Postharvest Pathogens of Banana (Musa acuminata L.)

Durgadevi Dhakshinamoorthy; Srivignesh Sundaresan; Arumukapravin Iyadurai; Kizhaeral Sevathapandian Subramanian; Gnanaguru Janaki Janavi; Gopinathan Paliyath; Jayasankar Subramanian

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저자정보: Durgadevi Dhakshinamoorthy (Tamil Nadu Agricultural University) Srivignesh Sundaresan (Tamil Nadu Agricultural University) Arumukapravin Iyadurai (Tamil Nadu Agricultural University) Kizhaeral Sevathapandian Subramanian (Tamil Nadu Agricultural University) Gnanaguru Janaki Janavi (Tamil Nadu Agricultural University) Gopinathan Paliyath (University of Guelph) Jayasankar Subramanian (University of Guelph)

저널정보: 한국식물병리학회 The Plant Pathology Journal The Plant Pathology Journal 제36권 제2호

발행연도: 2020.4

수록면: 133 - 147 (15page)

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Hexanal, a C-6 aldehyde has been implicated to have antimicrobial properties. Hence, this study was conducted to determine the antifungal activities of hexanal vapor against major postharvest pathogens of banana viz., Colletotrichum gloeosporioides and Lasiodiplodia theobromae. The pathogens were cultured in vitro and exposed to hexanal vapor at 600, 800, 1,000 and 1,200 ppm. Mycelial growth of both fungal pathogens were inhibited completely at 800 ppm and the incidence of anthracnose and stem-end rot diseases reduced by 75.2% and 80.2%, respectively. The activities of peroxidase, polyphenol oxidase, phenylalanine ammonia-lyase and glucanase had transiently increased in hexanal vapor treated banana by 5 to 7 days and declined thereafter. Postharvest treatment of banana with hexanal vapor resulted in phospholipase D inhibition and also resulted in cell wall thickening of the treated fruit, which impeded the penetration of the pathogenic spores. This was further confirmed by scanning electron micrographs. The defense-related protein intermediaries had increased in hexanal vapor treated banana fruit, which suggests induced resistance against C. gloeosporioides and L. theobromae, via., the phenylpropanoid pathway which plays a significant role in hindering the pathogen quiescence. Delayed ripening due to inhibition of phospholipase D enzyme, inhibition of mycelial growth and induced systemic resistance by defense enzymes collectively contributed to the postharvest disease reduction and extended shelf life of fruit.

#banana #defense proteins #hexanal #induced resistance #postharvest diseases

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