Degradation and transformation of a potential natural herbicide in three soils.
Degradation and transformation of a potential natural herbicide in three soils.
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一种潜在天然除草剂在三种土壤中的降解和转化。
DOI：
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发表时间：
1999
影响因子：
6.1
通讯作者：
Alessandro Esposito
中科院分区：
文献类型：
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作者：
C. Vischetti;Alessandro Esposito
镰刀菌甲酸甲酯(ME)是尼伽麦镰刀菌产生的四种毒素之一，可作为一种天然除草剂来防治杂草Striga hermonthica，Striga hermonthica是西非和中非广大地区的一种寄生高粱和玉米的杂草。通过室内试验，研究了不同温度和水分条件下，ME在三种土壤类型中的降解情况，以确定单一ME处理是否能在作物生长的关键时期保护作物免受该杂草的侵染。结果表明，在所有土壤和所有培养条件下，持续时间足以保护作物生长的第一周，不包括在腐殖质土壤中30℃的试验，那里的半衰期为6天，需要不止一次处理。用气相色谱/质谱联用法鉴定了甲醚(丁基吡啶，BP)的降解产物，并对其降解进行了测定。在所有土壤和培养条件下，前7d的ME和BP残留量之和几乎是施用量的100%，这表明BP可能是现阶段ME唯一的转化产物。
The methyl ester of fusaric acid (ME) is one of four toxins produced by the fungus Fusarium nygamai, which could be used as a natural herbicide against Striga hermonthica, a parasitic weed of sorghum and corn in a vast zone of West and Central Africa. A laboratory study was performed to measure the degradation of ME in three soil types and under different temperature and soil moisture conditions, so as to ascertain whether a single ME treatment would protect the crops against this weed during the critical phases of growth. The results show that the persistence in all soils and under all incubation conditions is long enough to protect the crops for the first week of growth, excluding the trial at 30 degrees C in the humic soil, where the half-life of 6 days would require more than one treatment. A degradation product of ME (butylpyridine, BP) was identified by gas chromatography/mass spectrometry and its degradation measured. The sum of ME and BP residues for the first 7 days was almost 100% of the applied compound in all soils and incubation conditions, thus indicating that BP may be the only transformation product of ME at this stage.