中文摘要：

以麻疯树种子的萌发率、胚根长度、根活力指数、叶绿素及光合作用作为测量指标，以化感效应敏感指数RI为评价指标，研究了麻疯树对2种经济作物烟草和玉米的化感作用。结果表明：不同的麻疯树器官水浸液对烟草和玉米的抑制程度不同：种子〉叶〉枝。烟草和玉米对低浓度麻疯树水浸液的反应不同：烟草种子萌发与幼苗生长没有受到明显抑制，而玉米种子萌发及幼苗生长则受到促进；玉米地下部分对麻疯树化感物质较地上部分敏感，烟草则无明显区别。麻疯树水浸液对玉米和烟草幼苗生长的抑制作用在生理上表现为：抑制光合作用、减少气孔开放和胞间CO2浓度、降低根活力指数和叶绿素含量，以及种子吸胀过程中的主动吸收，增强呼吸作用。

英文摘要：

Jatropha curcas which can be used to make biodiesel is widely planted. It is necessary to study the allelopathy of J. curcas on other plants in order to increase land utility efficiency and economic incomes. The allelopathy of J. curcas on tobacco and corn was measured by seedlings＇ germination, length of root, root activity,, content of chorophyll and photosynthesis. The result showed that the inhibitive degree of aqueous extracts of different part of J. curcas was seeds〉leaves〉branches. The aquaous extracts of different parts of J. curcas of low concentration was not apparently inhibited seedlings＇ growth of tabacco. But the seedlings＇ growth of corn was prompted by aqueous extracts of low concentration. The underground part of corn seedlings was more sensitive than the part on the ground to the allelopathy of J. curcas, but the seedlings of tobacco showed no such obvious difference. The physical inhibition of aqueous extracts to the seedlings of corn and tobacco was showed as restraining photosynthesis, root activities, imbibition of seeds, chlorophyll content, but enhancing transpiration.