唐古特大黄药材提取物对小麦和垂穗披碱草种子萌发和幼苗生长的影响

测定了唐古特大黄（Rheum tanguticum Maxim. ex Balf.）药材水提液、蒽醌粗提液和多糖粗提液对小麦(Triticum aestivum Linn.)和垂穗披碱草（Elymus nutans Griseb.）种子萌发及幼苗生长的影响。结果表明：唐古特大黄药材水提液存在明显的化感作用，水提液在高浓度下对小麦种子萌发和芽长及垂穗披碱草种子萌发、根长和芽长均有明显的抑制作用，而在低浓度下对小麦的根长和芽长具有促进作用。蒽醌粗提液仅对垂穗披碱草幼苗生长有抑制作用，其作用随浓度的提高而增强。多糖处理液抑制了小麦、垂穗披碱草根的生长，同时高浓度的处理液延迟了垂穗披碱草种子发芽。

Effects of Extracts from Root of Rheum tanguticum on Seed Germination and Seedling Growth of Triticum aestivum and Elymus nutans

The effects of extracts from root of Rheum tanguticum on seed germination and seedling growth of Triticum aestivum and Elymus nutans were determined. The main results were as follows: Strong allelopathic effects of the aqueous extracts were observed. Higher concentration of the aqueous extracts could inhibit the seed germination and seedling growth of T. aestivum and E. nutans, while lower concentration of the aqueous extracts could accelerate seedling growth of T. aestivum. The crude anthraquinone extracts only inhibited the seedling growth of E. nutans and the inhibiting effects became stronger with the increased concentration. The crude polysaccharide extracts inhibited the root growth of T. aestivum and E. nutans, and high concentrations of polysaccharide extracts prolonged seed germination of E. nutans.