Diversity of the Actinomycetes Community Colonising Rice Straw Residues in Cultured Soil Undergoing Various Crop Rotation Systems in the Mekong Delta of Vietnam
نویسنده
چکیده
Actinomycetes are involved in important environmental processes such as the decomposition of organic matter. In this study, we examined the impact of crop rotation on the actinomycetes community colonizing rice straw residues in soil over 3 field seasons by means of Denaturing Gradient Gel Electrophoresis (DGGE) fingerprinting analysis of actinomycetes 16S rRNA gene fragments amplified from field-incubated rice straw residues and analysis of actinomycetes 16S rRNA gene clone libraries from selected samples. The studied yearly crop rotation systems were rice-rice-rice (CRS1), rice-ricebaby corn (CRS2), rice-rice-mungbean (CRS3) and baby corn-rice-mungbean (CRS4), applied on different experimental plots of the same field location. Litter bags containing rice stems were inserted into the soil and recollected at different time points for comparison of the structure of the actinomycetes community colonizing the rice straw. The actinomycetes community was significantly different in composition in the baby cornrice-mungbean rotation system (CRS4) compared to those in the 3 other systems during the growth of the first crop and second crop. In contrast, during the cultivation of the third crop, actinomycetes communities were significantly different in the rice-rice-rice (CRS1) system compared to those in the 3 other systems. The analysis of the 16S rRNA gene libraries constructed from selected samples of rotation systems CRS1 and CRS4 during growth of the first two crops confirmed the DGGE results. The diversity of actinomycetes tended to be highest in the CRS4 system and lowest in the CRS1 system.
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