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Aims: Aerobic rice is a potential crop introduced to encourage water conservation in rice planting. However, a decline of aerobic rice yield has been reported and thus this study was initiated with the aim to observe the response of microbial community in this environment which are exposed to various plant growth stage and soil types. Methodology and results: To determine the effect of soil types such as peat and sandy clay loam on microbial community. A total of four growth stages were tested namely vegetative, reproductive, ripening and maturing. To determine the influence of growth stages and soil types towards microbial community in aerobic rice, Biolog EcoplateTM technique was used to quantify the response of microbial community through microbial functional diversity and carbon source utilization. The abundance of culturable aerobic bacteria, fungi, actinomycetes, nitrogen-fixing microorganism and phosphate-solubilizing microorganism were determined using five different selective media. Soil physical and chemical properties as well as total nitrogen in plant tissues were also determined. It was found that microbial functional diversity during plant growth (except for microbial evenness) varied between the soil types. Correlation analysis revealed different relationships between carbon source utilization and microbial functional diversity in both soil types. Conclusion, significance and impact of study: Microbial community in rhizosphere responded according to plant development which is primarily determined by soil type. Therefore, it is concluded that soil type particularly the soil physical and chemical properties are important factors in shaping the microbial community by directly influencing the rhizosphere environment.

The response of microbial community in aerobic rice rhizosphere that affected by various plant growth stages and soil types