| Structure Identification: |
| Biochemical Systematics and Ecology.1991; 19(6):497-506. | | Isoflavonoid phytoalexins from the fungus-inoculated leaflets of Erythrina species.[Reference: WebLink] |
METHODS AND RESULTS:
Using the drop-diffusate technique, a total of 14 isoflavonoid phytoalexins have been variously isolated from the fungus (Helminthosporium carbonum)-inoculated leaflets of 33 Erythrina species and subspecies. These compounds have been identified as 2′-hydroxydaidzein, genistein and 2′-hydroxygenistein (all isoflavones), 2′-hydroxydihydrodaidzein and dalbergiodin (both isoflavanones), demethylvestitol and isovestitol (both isoflavans), and demethylmedicarpin, glycinol, Isomedicarpin, phaseollidin, sandwicarpin, sandwicensin and cristacarpin (all pterocarpans). Diffusates from both control (water-treated) and fungus-inoculated leaflets of E. berenices and E. macrophylla also contained the constitutive isoflavone daidzein.
CONCLUSIONS:
With the exception of daidzein, all the Erythrina isoflavonoids (applied level 25 μg) inhibited the growth of Cladosporium herbarum on silica gel thin-layer plates. The survey data suggest that in terms of its isoflavonoid chemistry, the genus Erythrina has a close affinity with subtribes Diocleinae-Glycininae-Phaseolinae of the tribe Phaseoleae. |
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