Microbial communities of continuously cropped, irrigated rice fields.

Applied and Environmental Microbiology
W ReichardtJ Doll

Abstract

In continuously cropped, irrigated rice fields, soil microbial biomass as measured by total phospholipid fatty acid concentrations declined during the second half of the crop cycle. This decline was also observed in other components of the microbial community assessed by viable counts, including denitrifiers and sporeformers. Simultaneous with total biomass decline was the increase in potential indicators of nutrient stress--such as ratios of cyclopropanol ((Sigma)[cy/(omega)7c]) and trans ((Sigma)[(omega)7t/(omega)7c]) phospholipid fatty acids--in plain crop soil but not in the rhizosphere. Polyhydroxyalkanoate levels were enhanced in the root environment of mature rice. Polyunsaturated eukaryotic biomarkers accounted for only 13 to 16 mol% of the total phospholipids, including 2 mol% of 18:2(omega)6, which is considered a fungal biomarker. Single biomarkers for defined physiological groups of bacteria did not follow the declining trend of total microbial biomass. Signature compounds for gram-positive and gram-negative fermenters (plasmalogen phospholipids), methanogenic bacteria (diether lipids), and methanotrophs (18:1(omega)8c) increased as the crop approached maturity. Methanotrophs were not particularly enriched in the rh...Continue Reading

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Citations

Dec 13, 2005·Brazilian Journal of Biology = Revista Brasleira De Biologia·M H L R Reche, L M Fiuza
May 4, 2007·Bulletin of Environmental Contamination and Toxicology·Haifeng QianYingchong Lu
May 10, 2002·Environmental Microbiology·Jennifer L MacaladyKate M Scow
May 1, 2004·FEMS Microbiology Ecology·Yahai LuMakoto Kimura
Mar 7, 2001·Applied and Environmental Microbiology·S WeberR Conrad
Jun 26, 2001·Environmental Microbiology·A FeyR Conrad
Aug 26, 2006·Biotechnology and Bioengineering·Dipesh K Dey, Saumyen Guha
Aug 28, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Peter R HobbsRaj Gupta
May 18, 2013·Journal of Basic Microbiology·Himadri Bhusan BalTapan K Adhya
Dec 18, 2020·Frontiers in Microbiology·Youhua YaoKunlun Wu
Dec 14, 2005·Applied and Environmental Microbiology·I C Mendes, P J Bottomley
Dec 3, 1998·Applied and Environmental Microbiology· Gro kopf RW Liesack
Jan 29, 2019·Environmental Science. Processes & Impacts·Rawlings N AkondiSusan M Pfiffner
Feb 6, 2019·Rapid Communications in Mass Spectrometry : RCM·Kyle Mason-JonesMichaela A Dippold

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