biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 43:427-431, 2000 | DOI: 10.1023/A:1026723217094

The Ecological Significance of Allelopathy in the Community Organization of Alhagi Graecorum Boiss

A.A. El-Khatib1
1 Department of Botany, Faculty of Science, South Valley University, Sohag, Egypt

Field study revealed that species diversity index of the community was 0.597. The data of interspecific association index of Alhagi graecorum and each of its associates, Chenopodium murale, Glinus lotoides and Malva parviflora, were 0.35, 0.41 and 0.33, respectively. Therefore, a net negative association and low diversity among the species were the main characters of the community. Laboratory experiments verified the role played by competition and allelopathy in this community organization. The bioassay results indicated that A. graecorum exhibited phytotoxic activity on the tested species. Accordingly, water-borne allelopathic compounds may be released from A. graecorum into the environment and suppress the growth of its associates where they were not able to compete with A. graecorum in the field, so the latter species become dominant.

Keywords: allelochemicals; association index; diversity index; Chenopodium murale; Glinus lotoides; Malva parviflora; resource competition
Subjects: Alhagi graecorum; allelopathy, resource competition; association index, allelopathy; Chenopodium murale; community organization, allelopathy; diversity index, allelopathy; Glinus lotoides; Malva parviflora; resource competition, alellochemicals

Published: September 1, 2000  Show citation

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El-Khatib, A.A. (2000). The Ecological Significance of Allelopathy in the Community Organization of Alhagi Graecorum Boiss. Biologia plantarum, 43(3), 427-431. doi: 10.1023/A:1026723217094
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