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The Importance of Allelopathy in Breeding New Cultivars

By Kim, Kil-Ung

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Book Id: WPLBN0000034555
Format Type: PDF eBook
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Title: The Importance of Allelopathy in Breeding New Cultivars  
Author: Kim, Kil-Ung
Language: English
Subject: United Nations., Food and Agriculture Organization of the United Nations. FAO agriculture series, Agriculture
Collections: United Nations Food and Agriculture Organization Collection
Publication Date:
Publisher: Food and Agriculture Organization of the United Nations; Digitizer: Fao


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Kim, K. U. (n.d.). The Importance of Allelopathy in Breeding New Cultivars. Retrieved from

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Excerpt: Allelopathy is defined as the direct influence from a chemical released from one plant on the development and growth of another. It is known that allelopathic substances are induced by environmental stresses, as shown in Figure 1. Allelopathic compounds may be released into the environment from plants by means of root exudation, leaching, volatilization and decomposition of plant residues in the soil (Figure 1). Allelopathic substances, if present in crop varieties, may reduce the need for weed management, particularly herbicide use. Allelopathy alone may not be a perfect weed management technology but it may be a supplementary tool for weed control. It is extremely difficult to demonstrate allelopathy in nature because of the complexity of plant interference which includes positive, negative and neutral effects on each other (Christensen, 1993). Interference is a combination of the processes of competition for resources and production of allelopathic compounds which suppress competitors (Duke et al. 2001). Thus, allelopathy differs from resource competition. Alleopathy research has been conducted for several decades, but very limited knowledge is still available. An improvement in crop cultivars is the only area that has not been exploited to any great extent as a weed management strategy (Khush, 1996). The possibility of incorporating allelopathic traits into improved rice cultivars, which would reduce the need for applying herbicides to the crop, is worth exploring (Khush, 1996). Of course, thus far, no commercial cultivars carrying allelopathic properties have been developed (Duke et al. 2001).


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