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

Ji Yeon Oh, Mee Kyung Sang, Mun Il Ryoo, Ki Deok Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

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°C to 27.0°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, Sphin- gomonas, 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<.001) and total Penicillium (r=0.906, P<0.05); A. flavus was positively correlated with total Aspergillus (r=0.913, P<00.5) 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.

Original languageEnglish
Pages (from-to)74-79
Number of pages6
JournalPlant Pathology Journal
Volume24
Issue number1
DOIs
Publication statusPublished - 2008 Dec 1

Fingerprint

storage conditions
brown rice
Penicillium
rice
fungi
Aspergillus candidus
Aspergillus
relative humidity
bacteria
Bacillus (bacteria)
Aspergillus flavus
Methylobacterium
Microbacterium
Sphingomonas
temperature
environmental factors
Aspergillus fumigatus
storage time

Keywords

  • Aspergillus
  • Penicillium
  • Relative humidity
  • Rice
  • Storage bacteria
  • Storage fungi
  • Temperature

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Temporal changes of fungal and bacterial populations in rice under indoor storage conditions. / Oh, Ji Yeon; Sang, Mee Kyung; Ryoo, Mun Il; Kim, Ki Deok.

In: Plant Pathology Journal, Vol. 24, No. 1, 01.12.2008, p. 74-79.

Research output: Contribution to journalArticle

Oh, Ji Yeon ; Sang, Mee Kyung ; Ryoo, Mun Il ; Kim, Ki Deok. / Temporal changes of fungal and bacterial populations in rice under indoor storage conditions. In: Plant Pathology Journal. 2008 ; Vol. 24, No. 1. pp. 74-79.
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AB - 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°C to 27.0°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, Sphin- gomonas, 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<.001) and total Penicillium (r=0.906, P<0.05); A. flavus was positively correlated with total Aspergillus (r=0.913, P<00.5) 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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