Namiki Sayuri, Seike Nobuyasu, Motoki Yutaka
Institute for Agro-Environmental Sciences, NARO, 3-1-3 Kannondai, Tsukuba, Ibaraki 305-8604, Japan.
J Pestic Sci. 2019 Feb 20;44(1):1-8. doi: 10.1584/jpestics.D18-062.
The relationships between plant growth stage and pesticide-uptake ability were investigated cultivation of L. var. in soil to which was added four pesticides of relatively high log : fenobucarb, procymidone, flutolanil, and tolclofos-methyl. The root concentrations of pesticides were low in very young seedlings with undeveloped root systems, highest in seedlings with developed root systems, and tended to decrease until the usual harvesting stage. Additionally, the shoot concentrations of tested pesticides showed the same trends as the roots. The pesticide-uptake abilities of roots were lowest in very young seedlings and then constant for seedlings until the harvesting stage. In contrast, the pesticide-translocation abilities from root to shoot were constant regardless of growth stage. The results indicated that changes in shoot concentrations with growth stage were affected by the development of the root system and pesticide-uptake ability of roots.
研究了植物生长阶段与农药吸收能力之间的关系，在添加了四种log Kow相对较高的农药（仲丁威、腐霉利、氟酰胺和甲基立枯磷）的土壤中种植变种L.。在根系未发育的非常幼嫩的幼苗中，农药的根浓度较低，在根系发达的幼苗中最高，并在通常的收获阶段之前趋于下降。此外，受试农药的地上部浓度与根部表现出相同的趋势。根系的农药吸收能力在非常幼嫩的幼苗中最低，然后在收获阶段之前对于幼苗保持恒定。相反，无论生长阶段如何，从根到地上部的农药转运能力是恒定的。结果表明，地上部浓度随生长阶段的变化受根系发育和根系农药吸收能力的影响。
