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Temporal changes of fungal and bacterial populations in rice under indoor storage conditions

Authors
Oh, Ji YeonSang, Mee KyungRyoo, Mun IlKim, Ki Deok
Issue Date
3월-2008
Publisher
KOREAN SOC PLANT PATHOLOGY
Keywords
Aspergillus; Penicillium; relative humidity; rice; storage bacteria; storage fungi; temperature
Citation
PLANT PATHOLOGY JOURNAL, v.24, no.1, pp.74 - 79
Indexed
SCIE
SCOPUS
KCI
Journal Title
PLANT PATHOLOGY JOURNAL
Volume
24
Number
1
Start Page
74
End Page
79
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/124002
DOI
10.5423/PPJ.2008.24.1.074
ISSN
1598-2254
Abstract
This research was conducted to evaluate fungal and bacterial populations in unhulled and brown rice under indoor storage conditions, and to examine the relationship between microbial populations and environmental conditions such as temperature and relative humidity. The temperature and relative humidity of the storage room ranged from 22.6 degrees C to 27.0 degrees C and 23.3% to 44.2%, respectively. Total fungal and bacterial populations remained relatively stable over the storage period. Predominant fungi included Aspergillus candidus, A. flavus, A. fumigatus, and Penicillium spp.; the predominant bacteria were Bacillus, Microbacterium, Sphingomonas, and Methylobacterium spp. Total fungi and bacteria were not significantly correlated with either unhulled (r=0.448, P=0.372) or brown (r=0.466, P=0.351) rice. In unhulled rice, total fungi showed positive correlations with total Aspergillus (r=0.994, P<0.001) and total Penicillium (r=0.906, P<0.05); A. flavus was positively correlated with total Aspergillus (r=0.913, P<0.05) and total fungi (r=0.868, P<0.05). In brown rice, Bacillus spp. was also positively correlated with total bacteria (r=0.998, P<0.001). Mean temperature was negatively correlated with A. candidus (r=-0.852, P< 0.05) and total fungi (r=-0.961, P<0.01), and mean relative humidity was positively correlated with total Penicillium spp. (r=0.884, P<0.05) in brown rice. Hence these results could provide basic information on the fungal and bacterial populations in unhulled and brown rice stored under room conditions, and on the effect of environmental conditions on the populations of fungi and bacteria, especially Aspergillus and Penicillium spp.
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College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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