Mucha-Pelzer Tanja, Mewis Inga, Ulrichs Christian
Division Urban Plant Ecophysiology, Landwirtschaftlich-Gärtnerische Fakultät, Humboldt-Universität zu Berlin, Lentzeallee 55, 14195 Berlin, Germany.
J Agric Food Chem. 2010 Dec 8;58(23):12473-80. doi: 10.1021/jf102847p. Epub 2010 Nov 12.
Silica-based substances have increased in popularity in recent years as alternative insecticides in horticultural crop protection. However, no research has been conducted into the influence of silica on plant biochemistry. Formulations (Fossil Shield 90.0s, AE R974, AL-06-109, Surround) were applied electrostatically on pak choi. Plants were harvested on two dates to measure immediate (first) and decelerated (second) influence, as well as recovery following the removal of silica formulations. The predominant individual glucosinolate (GS) in pak choi Black Behi was 1-methoxy-3-indolylmethyl GS. A significant increase in total glucosinolate contents in all treatments was measured from the first to second harvest. During the first harvest, no changes in glucosinolate levels in plants were found in any of the treatments. After a 48 h recovery period, two substances showed decreased amounts for indole GS compared to the control. Flavonoids (kaempferol and isorhamnetin) decreased from the first to second harvest. Kaempferol in particular decreased in treated plants from the first to second harvest date. The shading of leaves by silica mainly caused the decrease in secondary metabolites in treated plants. Treatments with silica formulations as an alternative insecticide cause shifts in the composition and contents of bioactive secondary metabolites in Brassica rapa spp. chinensis plants and should, therefore, be used with care to control insects.
近年来，硅基物质作为园艺作物保护中的替代杀虫剂越来越受欢迎。然而，尚未对硅对植物生物化学的影响进行研究。将制剂（Fossil Shield 90.0s、AE R974、AL-06-109、Surround）以静电方式施用于小白菜。在两个日期收获植株，以测量即时（第一次）和延缓（第二次）影响，以及去除硅制剂后的恢复情况。小白菜“黑贝希”中主要的单个硫代葡萄糖苷（GS）是1-甲氧基-3-吲哚甲基GS。从第一次收获到第二次收获，所有处理中总硫代葡萄糖苷含量均显著增加。在第一次收获时，任何处理的植株中硫代葡萄糖苷水平均未发现变化。经过48小时的恢复期后，与对照相比，两种物质的吲哚GS含量下降。黄酮类化合物（山奈酚和异鼠李素）从第一次收获到第二次收获有所减少。特别是在处理过的植株中，从第一次收获到第二次收获日期，山奈酚含量下降。硅对叶片的遮光作用主要导致处理过的植株中次生代谢产物减少。使用硅基制剂作为替代杀虫剂进行处理会导致小白菜植株中生物活性次生代谢产物的组成和含量发生变化，因此，在控制虫害时应谨慎使用。
