乡土植物白刺花对紫茎泽兰化感作用的响应

为了解乡土植物白刺花对紫茎泽兰化感作用的耐受程度及抵御机理,以2—3年生紫茎泽兰叶片为供体材料,用不同浓度的紫茎泽兰叶片浸提液处理白刺花种子及幼苗。结果表明:紫茎泽兰叶片浸提液对白刺花的影响为低浓度促进,高浓度抑制。当浓度为0.5%时促进效应最强,当浓度大于2.0%时抑制效应明显增加。白刺花种子萌发速率比萌发率对紫茎泽兰化感作用反应敏感,胚轴比胚根敏感,随着幼苗的生长,其抵御紫茎泽兰化感作用的能力逐渐增强,丙二醛的含量与植株生长响应规律相对应,并且经紫茎泽兰浸提液处理能极大的增加白刺花幼苗菌根率,缩短菌根形成的时间。

Response of native plant species Sophora davidii to allelopathy of Eupatorium adenophorum

The seeds and seedlings of native plant species Sophora davidii were treated using an extraneous solution for 2-3 years with different concentrations of aqueous leaf extract of Eupatorium adenophorum to analyze tolerance degree and resistance mechanism of S. davidii under allelopathic effect. The result showed that the aqueous leaf extract of E. adenophorum could inhibit seed germination and seedling growth of S. davidii at high concentration. On the other hand, the aqueous leaf extract of E. adenophorum could promote seed germination and seedling growth of S. davidii at low concentration. Furthermore, a concentration of 0.5% has the strongest promoting effect, whereas when the concentration is greater than 2.0%, the inhibition effect significantly increased. Seed germination speed was more sensitive to the extract than seed germination rate. The hypocotyl is more sensitive than the radicle. With seedling growth, the ability of S. davidii to resist the allelopathic effect of E. adenophorum gradually increased. MDA content is proportional to the plant growth response; it could greatly increase rhizobium growth probability of S. davidii seedling and decrease the time of mycorrhiza formation through the treatment of the aqueous leaf extract of E. adenophorum.