【水稻田土壤中异恶草酮的生物降解】Patrick L. Tomco William E. Holmes and Ronald S. Tjeerdema. Biodegradation of Clomazone in a California Rice Field Soil: Carbon Allocation and Community Effects. J. Agric. Food Chem. 2013 61 (11) pp 2618–2624 DOI: 10.1021-jf304692c
Abstract
Degradation pathways for the herbicide clomazone in a California rice field soil were characterized via pulse-labeling of anaerobic (flooded) and aerobic (moist) soil microcosms. Clomazone-derived 13C in the major C pools of a rice ecosystem and soil phospholipid fatty acid (PLFA) profiles were analyzed over time to determine if (1) the compound accumulates in the microbial biomass (2) it affects temporal microbial population dynamics and (3) it is either preferentially metabolized or cometabolized. In anaerobic microcosms the compound was rapidly biotransformed to ring-open clomazone upon which it persisted in the aqueous phase whereas aerobic microcosms degraded it slower but a greater percentage was mineralized. Anaerobic biomass decreased after clomazone was added and aerobic actinomycete abundance differed between treatments and controls. Additionally PLFA and 13C PLFA were statistically similar between treatment and controls. Thus microbial cometabolism is likely to be the dominant degrading mechanism governing clomazone fate in California rice fields.
【盐胁迫条件下莴苣植物中碘对酚类物质代谢的影响】Begoña Blasco Rocio Leyva Luis Romero and Juan Manuel Ruiz.Iodine Effects on Phenolic Metabolism in Lettuce Plants under Salt Stress. J. Agric. Food Chem. 2013 61 (11) pp 2591–2596 DOI: 10.1021-jf303917n
Abstract