Isolation of yeasts from palm tissues damaged by the red palm weevil and their possible effect on the weevil overwintering |
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| Authors: | Fukiko Abe Misako Ohkusu Tatsuya Kubo Susumu Kawamoto Koichi Sone Kunihiko Hata |
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| Institution: | (1) United Graduate School of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan;(2) Medical Mycology Research Center, Chiba University, Chiba 260-8673, Japan;(3) Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan; |
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| Abstract: | Rhynchophorus ferrugineus is a tropical pest of palms that has recently invaded Japan, where winter temperatures fall below 0°C. Because activities
of the weevil at temperatures <13°C are extremely limited, it appears difficult for them to overwinter in Japan. However,
the temperature of palm tissues damaged by this weevil has been observed to be higher than air temperature. Here, we looked
for the cause of this temperature increase. First, we measured the temperature of damaged palm tissues and showed it to be
between 30°C and 40°C, even in winter. Next, we isolated yeasts from the body of weevils and infested palm tissues and obtained
36 yeast strains, mostly Candida tropicalis and C. ethanolica. Then, we analyzed the soluble sugar composition in palm tissues and found that it included glucose, sucrose, and fructose.
Because at least C. tropicalis can ferment some of these sugars, the temperature increase may be attributed to fermentation of microbes, including yeasts. |
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| Keywords: | Fermentation heat |
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