Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit

Longan (Dimocarpus longan Lour.) fruit have a very short postharvest shelf life due to microbial decay and exocarp browning. The most common commercial means for prevention of longan fruit rot and browning is SO2 fumigation, but it is facing food safety regulations and alternatives are needed. The a...

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Main Authors: Porntip Thavong, Douglas D. Archbold, Tanachai Pankasemsuk, Rumphan Koslanund
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/49767
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spelling th-cmuir.6653943832-497672018-09-04T04:30:50Z Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit Porntip Thavong Douglas D. Archbold Tanachai Pankasemsuk Rumphan Koslanund Biochemistry, Genetics and Molecular Biology Chemistry Materials Science Mathematics Physics and Astronomy Longan (Dimocarpus longan Lour.) fruit have a very short postharvest shelf life due to microbial decay and exocarp browning. The most common commercial means for prevention of longan fruit rot and browning is SO2 fumigation, but it is facing food safety regulations and alternatives are needed. The aims of this study were to determine if the natural volatile hexanal could inhibit mycelial growth and spore germination of common longan decaycausing fungi, and if hexanal could affect fungal-derived cell-wall degrading enzymes that are involved in pathogenicity. Four common longan fruit decay fungi, Lasiodiplodia theobromae; Pestalotiopsis sp.; Phomopsis sp.; and Curvularia sp., were exposed to hexanal vapour, and mycelial growth in vitro was measured. Also, hexanal vapour effects on spore germination, mycelial morphology, and activity of extracellular enzymes of L. theobromae were studied. L. theobromae growth was completely suppressed at a lower hexanal volume than the other fungi. Fumigation for 1 h with 15 μL hexanal per Petri dish was enough to completely suppress L. theobromae, with lower volumes for 1 to 48 h resulting in variable levels of suppression but not fungicidal effects. Spore germination was inhibited at 5 μL per dish for only 1 h, and the effect was fungicidal at greater than 15 μL. Hexanal vapour appeared to induce cell swelling with greater vacuolation and more mycelial branching of L. theobromae. Extracellular cellulase activity was reduced more than 80% by hexanal, but pectin methylesterase, polygalacturonase, and cutinase activities were not affected. 2018-09-04T04:17:49Z 2018-09-04T04:17:49Z 2011-01-01 Journal 01252526 2-s2.0-78649764343 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78649764343&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/49767
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Biochemistry, Genetics and Molecular Biology
Chemistry
Materials Science
Mathematics
Physics and Astronomy
spellingShingle Biochemistry, Genetics and Molecular Biology
Chemistry
Materials Science
Mathematics
Physics and Astronomy
Porntip Thavong
Douglas D. Archbold
Tanachai Pankasemsuk
Rumphan Koslanund
Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
description Longan (Dimocarpus longan Lour.) fruit have a very short postharvest shelf life due to microbial decay and exocarp browning. The most common commercial means for prevention of longan fruit rot and browning is SO2 fumigation, but it is facing food safety regulations and alternatives are needed. The aims of this study were to determine if the natural volatile hexanal could inhibit mycelial growth and spore germination of common longan decaycausing fungi, and if hexanal could affect fungal-derived cell-wall degrading enzymes that are involved in pathogenicity. Four common longan fruit decay fungi, Lasiodiplodia theobromae; Pestalotiopsis sp.; Phomopsis sp.; and Curvularia sp., were exposed to hexanal vapour, and mycelial growth in vitro was measured. Also, hexanal vapour effects on spore germination, mycelial morphology, and activity of extracellular enzymes of L. theobromae were studied. L. theobromae growth was completely suppressed at a lower hexanal volume than the other fungi. Fumigation for 1 h with 15 μL hexanal per Petri dish was enough to completely suppress L. theobromae, with lower volumes for 1 to 48 h resulting in variable levels of suppression but not fungicidal effects. Spore germination was inhibited at 5 μL per dish for only 1 h, and the effect was fungicidal at greater than 15 μL. Hexanal vapour appeared to induce cell swelling with greater vacuolation and more mycelial branching of L. theobromae. Extracellular cellulase activity was reduced more than 80% by hexanal, but pectin methylesterase, polygalacturonase, and cutinase activities were not affected.
format Journal
author Porntip Thavong
Douglas D. Archbold
Tanachai Pankasemsuk
Rumphan Koslanund
author_facet Porntip Thavong
Douglas D. Archbold
Tanachai Pankasemsuk
Rumphan Koslanund
author_sort Porntip Thavong
title Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
title_short Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
title_full Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
title_fullStr Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
title_full_unstemmed Hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
title_sort hexanal vapours suppress spore germination, mycelial growth, and fungal-derived cell wall degrading enzymes of postharvest pathogens of longan fruit
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78649764343&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/49767
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