天仙子种子浸提液对黑麦草种子萌发和幼苗生长的化感作用

为了探究天仙子(Hyoscyamnus niger L.)对禾本科牧草的化感作用,以天仙子和黑麦草(Lolium perenne L.)为材料,通过5个不同浓度天仙子种子浸提液(0,0.025,0.05,0.075,0.1 g·mL-1),对黑麦草种子萌发和幼苗生长进行处理,测定黑麦草种子萌发和幼苗生长情况.结果表明:...

The Allelopathy of Hyoscyamus niger Seed Extract on Seed Germination and Seedling Growth of Lolium perenne

In order to explore the allelopathy, taking Hyoscyamus niger L. and Lolium perenne L. as materials, the ryegrass seed germination and seedling growth were repectivey treated under 5 different concentrations of Hyoscyamus niger seed extracts (0, 0.025, 0.05, 0.075, 0.1 g·mL^-1) to measure the growth and development. The results demonstrated that H. niger extracts at different concentrations had an extremely significant effect on the seed germination of L. perenne (P<0.01). With the increase of extract concentration, the germination rate and germination index of L. perenne decreased significantly. The extracts had significant effects on root length, aboveground and underground biomass of L. perenne (P<0.05), but had no significant effect on plant height (P<0.05). Moreover, the root length and belowground biomass of L. perenne decreased, and the aboveground biomass increased firstly and then decreased. Under the treatment with H. niger extracts at different concentrations, malondialdehyde, proline contents and relative conductivity of L. perenne seedlings increased, while chlorophyll content in leaves decreased with the increase of extract concentration. To sum up, H. niger extract had a certain damage to the cell membrane of L. perenne seedlings. The internal physiological and biochemical processes was affected by the changes in cell membrane of L. perenne in order to adapt to the adverse environment. Competition through seed allelopathy may be another unique way of interspecific competition.