李苇洁,罗开源,吴 迪,罗 充

1 贵州省山地资源研究所, 贵阳 550001 2 六盘水市钟山区都市型现代农业产业园区管理委员会, 六盘水 553001 3 贵州师范大学, 生命科学学院, 贵阳 550001

乡土植物白刺花对紫茎泽兰化感作用的响应

李苇洁1,罗开源2,吴 迪1,罗 充3,*

1 贵州省山地资源研究所, 贵阳 550001 2 六盘水市钟山区都市型现代农业产业园区管理委员会, 六盘水 553001 3 贵州师范大学, 生命科学学院, 贵阳 550001

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。

乡土植物；白刺花；紫茎泽兰；化感作用；响应

Abstract： The seeds and seedlings of native plant speciesSophoradavidiiwere treated using an extraneous solution for 2—3 years with different concentrations of aqueous leaf extract ofEupatoriumadenophorumto analyze tolerance degree and resistance mechanism ofS.davidiiunder allelopathic effect. The result showed that the aqueous leaf extract ofE.adenophorumcould inhibit seed germination and seedling growth ofS.davidiiat high concentration. On the other hand, the aqueous leaf extract ofE.adenophorumcould promote seed germination and seedling growth ofS.davidiiat 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 ofS.davidiito resist the allelopathic effect ofE.adenophorumgradually increased. MDA content is proportional to the plant growth response; it could greatly increase rhizobium growth probability ofS.davidiiseedling and decrease the time of mycorrhiza formation through the treatment of the aqueous leaf extract ofE.adenophorum.

KeyWords: native plants；Sophoradavidii；Eupatoriumadenophorum；allelopathy；response

紫茎泽兰(EupatoriumadenophorumSpreng.)为菊科泽兰属多年生草本植物,原产中美洲,自20世纪40—50年代入侵到中国以来,已成为西南地区主要外来入侵植物,具有较强的化感作用[1- 4]。对当地自然和农业生态系统造成了严重危害[5]。在贵州西南部,紫茎泽兰入侵严重,乡土植物受到排挤,生物多样性降低。……