阔叶丰花草对茄科作物的化感效应

Allelopathic Effect of Alien Invasive Borrerialatifolia on Solanaceae Crops

为探明入侵植物阔叶丰花草对茄科作物种子萌发和幼苗生长的影响,采用种子萌发与生物测定法,测定比较了阔叶丰花草不同浓度水提液处理番茄、茄子和辣椒种子的萌发率、幼苗的根长及茎长。结果表明:番茄和茄子的发芽速度指数随处理浓度上升而显著降低;番茄种子的萌发率略低于对照,均在93.33%以上;茄子和辣椒种子的萌发率均随水提液浓度的上升而降低,14d时分别在70%以上和66.67%以上;各浓度水提液番茄和茄子的根长显著低于对照,辣椒除高浓度外,根长均长于对照;培养7d时番茄的茎长短于对照,14d时均长于对照。结论:阔叶丰花草对番茄的综合化感效应表现为抑制作用;低浓度的水提液对茄子综合化感效应表现为促进作用,高浓度为抑制作用;辣椒则表现为抑制转变为促进,表现出一定的适应性。

The germination rate,root and stem length of tomato,eggplant and pepper seeds treated with different concentration of B.latifolia water extract were determined by seed germination and biological determination methods to study the effects of alien invasive B.latifolia on seed germination and growth of seedlings of Solanaceae crops.The results showed that：1 ）The germination rate index of tomato and eggplant decreases with increase of B.latifolia water extract concentration significantly;2） The germination rate of tomato seeds is lower than CK but the seed germination of different treatments is above 93.33%;3 ）The seed germination rate of eggplant and pepper decreases with increase of B. latifolia water extract concentration and is above 70% and above 66.67% after 14 d respectively;4）The root length of tomato and eggplant treated with different concentration of B.latifolia water extract is lower than CK significantly,except for pepper under the higher concentration;5）The stem length of tomato seedlings after 7d is shorter than CK but the stem length of tomato seedlings after 14d is higher than CK.The integrated allelopathic effect of B.latifolia on tomato is the inhibiting effect.The integrated allelopathic effect of B.latifolia with lower concentration and higher concentration is the promoting effect and inhibiting effect separately.Pepper shows the certain adaptability to B.latifolia.