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

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Science  29 Jun 1990:
Vol. 248, Issue 4963, pp. 1637-1639
DOI: 10.1126/science.248.4963.1637


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.

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