Allelopathic effect of alien invasive Borreria latifolia on Solanaceae crops.
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 7 d is shorter than CK but the stem length of tomato seedlings after 14 d 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.