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Science 29 June 1990:
Vol. 248. no. 4963, pp. 1637 - 1639
DOI: 10.1126/science.248.4963.1637
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Articles

Synthesis of Phytoalexins in Sorghum as a Site-Specific Response to Fungal Ingress

Beth A. Snyder 1 and Ralph L. Nicholson 1

1 Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907

Sorghum produces phytoalexins that are 3-deoxyanthocyanidin flavonoids. The compounds inhibit the growth of phytopathogenic fungi in vitro. The phytoalexins appear to be synthesized in subcellular inclusions within a host epidermal cell that is about to be penetrated by a fungus. This site-restricted synthesis suggests that the phytoalexin response occurs initially in the first cells that come under fungal attack and is not simply a response of cells that surround the original infection site.

Accepted on April 18, 1990


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