Allelopathic effects of volatile cineoles on two weedy plant species

被引:262
作者
Romagni, JG [1 ]
Allen, SN [1 ]
Dayan, FE [1 ]
机构
[1] USDA ARS, Nat Prod Utilizat Res Unit, University, MS 38677 USA
关键词
eucalyptol; essential oils; cineole; monoterpenes; chlorophyll fluorescence; Echinochloa crusgalli; Cassia obtusifolia; natural products; modeling;
D O I
10.1023/A:1005414216848
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The volatile monoterpene analogs, 1,4-cineole and 1,8-cineole, have been identified as components of many plant essential oils, but relatively little is known about their biological activities. We compared the effects of 1,4- and 1,8-cineole on two weedy plant species by monitoring germination, mitosis, root and shoot growth, chlorophyll content, and photosynthetic efficiency. 1,4-Cineole severely inhibited growth of roots and shoots, causing cork-screw shaped morphological distortion, whereas 1,8-cineole caused a decrease in root growth and germination rates. Chlorophyll fluorescence data (yield and F-v/F-m) indicated that 1,4-cineole caused significantly higher stress (P less than or equal to 0.001) to photosynthesis when compared to controls. Mitotic index data showed that 1,8-cineole severely decreased (P less than or equal to 0.001) all stages of mitosis when compared with controls, while 1,4-cineole only caused a decrease in the prophase stage (P less than or equal to 0.05). Although superficially similar in structure, these two cineoles appear to have different modes of action.
引用
收藏
页码:303 / 313
页数:11
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