【摘要】 <正> 一、前言 植物在其物质代谢的过程中,产生很多天然物质,这些天然物质往往能抑制其它植物的生长发育,这种现象被称为生化相克作用(Allelopathy)。 Rice(1974)在其“Allelopathy”一书中整理了大量的研究报告,清楚地阐明了这种现象在高等植物之间,高等植物对微生物,微生物对微生物以及浮游植物之间存在的普遍性。但是,国内在这方面的研究工作至今未见报道。更多还原

【Abstract】 Pedicularis longiflora Rudolph var. tubiform is(KIotz.) Tsoog is a kind of annual weed spreaded widely on Qinghaixizang (Tibet) Plateau. According to the information afforded by the department of agricultural production, if this 晈eed occurs in highland barley (Hordeum vulgare) fields, the germination of seeds and normal growth of young sprout of highland barley around it would be inhibited.Three sets of experiments on the extracts of Pedicularis longiflora Rudolph var. tubiformis (Klotz.) Tsoog have been carried out to find out the reasons for the occurrence of allelopathy.The tests of germination rate show that the seed germination of Hordeum vulgare, Avena sativa, Tritioum aestivum, Elymus nutans,Elymus canadensis, Agrostis hugoniana, Agropyron cristatum, Trifolium sp., Medicago sativa and Pedicularis kansuensis were completely inhibited when the concentration of aqueous solution of the extracts was 0.2g/ml(dry weight of intact weed). The lowest concentration that could inhibit the seeds of wheat (T, aestivum) apparently was 0.05g/ml.By separating the extracts, a chemical part ⅡB was obtained (the rate is 6%) and it could completely inhibit the seed germination of wheat (T. aestivum) when its concentration reaches 6mg/ml. If the concentration was 1.5mg/ml, the seed germination was inhibited apparently. The culture of seeds of wheat and oats in theⅡB aqueous solution at lower concentration shows that the root growth of both plants is in a regular inhibitory state. By the experiments of the root growth and the root cell-wall permeability of broad beans, the influence of Ⅱb aqueous solution (6mg/ml) on the seedling of broad beans was found. The normal cell division in root-growing zone and the normal cell elongating in stretching zone were inhibited. The tissue of cell wall was damaged, and a great deal of substances in the cell wall flew out. We consider this shows the allelopathy of the extracts.更多还原