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Additional phytoalexin‐like compounds in Ht‐gene resistance of corn to Helminthosporium turcicum
Author(s) -
OBI I. U.
Publication year - 1979
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1979.tb03887.x
Subject(s) - phytoalexin , biology , spore , germination , ethanol , spore germination , fungi imperfecti , exserohilum , botany , blight , biochemistry , resveratrol
SUMMARY Four additional compounds inhibitory to germination of Helminthosporium turcicum spores were isolated from lesion‐extracts of field‐grown Ht ‐gene corn ( Zea mays ) lines which were inoculated with H. turcicum. The compounds were named phytoalexins A 3 , A 4‐I , A 4‐II and A 5 . A 3 , A 4‐1 and A 4‐1 showed over 99% inhibition of H. turcicum spores at 1 mg/ml of 10% ethanol and LD 50 of about 600 μg/ml. A 5 showed an LD 50 of about 800 μg/ml of 10% ethanol. The ultraviolet, infrared, nuclear magnetic resonance, electron impact mass spectra and field desorption mass spectra showed that these compounds might be related to the previously described phytoalexins A 1 and A 2 . They seem to have the following functional groups: aromatic ring, hydroxyl and/or phenolic groups, carbonyl groups, probably a carboxylic acid or ester type and a long aliphatic side chain.