The inhibitory activities of the leachates and volatiles from 53 plant species (spices and herbs) were evaluated against lettuce ( "Great Lakes 366") seedling growth using the sandwich and dish pack methods, respectively. With the sandwich method, parsley () showed the strongest inhibitory effect on lettuce radicle growth (77%), followed by tarragon () (72%). However, caraway (), dill () (seed), laurel (), rosemary (), and sage () were the most inhibitory species (100% inhibition of lettuce radicle and hypocotyl growth inhibition at all distance wells) in the dish pack method. Cardamom () and thyme () also showed strong inhibitory activity (100% for radicle and hypocotyl growth inhibition at all 41 and 58 mm distance wells). The headspace sampling and gas chromatography-mass spectrometry (GC-MS) analysis identified the main inhibitory active compounds as carvone in caraway and dill (seeds), 1,8-cineole in laurel and cardamom, and borneol in thyme. Both camphor and 1,8-cineole were detected in rosemary and sage, and the total activity evaluation showed that camphor was the major inhibitory compound in rosemary, although both compounds played equal roles in sage.
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| http://dx.doi.org/10.3390/plants9020264 | DOI Listing |
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