Shade Effect on Growth and Allelopathic Potential of Lettuce (Lactuca sativa L.) Cultivars
2006
Chon, S.U. (Gwangju Institute of Science and Technology, Gwangju, Republic of Korea), E-mail: [email protected]
Lettuce (Lactuca sativa L.) is known to contain water soluble substances that are allelopathic. Laboratory and greenhouse experiments were carried out to determine shading effect on growth, allelopathic potential, and chlorogenic acid level of lettuce cultivars during the spring growing season. Shade significantly reduced shoot weight, number of leaves and chlorophyll content of lettuce plants, while it increased their plant height. Aqueous leaf extracts from three lettuce cultivars grown under different shading levels reduced seedling growth of alfalfa, and the extent of reduction increased with increasing of shading levels.
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