67 STRIGOLACTONES, GERMINATION STIMULANTS FOR ROOT PARASITES, PRODUCED BY COTTON AND SORGHUM

概要

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Seed germination of root parasitic weeds, Striga spp. and Orobanche spp., is elicited by exogenous stimulants released from roots of host and nonhost plants. Strigol was first isolated from a false host, cotton (Gossypium hirsutum L.) as a germination stimulant for S. asiatica and later also shown to be a major stimulant in root exudates of a host of S. hermonthica, sorghum (Sorghum bicolor (L.) Moench). Sorghum root exudates were reported to contain other stimulants including sorgolactone. Since trace levels of these known germination stimulants (strigolactones) can be detected by HPLC-tandem mass spectrometry (LC/MS/MS), root exudates of cotton and sorghum were analyzed with this method. It was confirmed that cotton (G. hirsutum cv. Fibre Max) produce strigol but not alectrol nor orobanchol. Although the major stimulant in sorghum root exudates has been identified as strigol with CI-MS of the heptafluorobutyrate derivative, it appears to be a novel strigol isomer, not strigol itself. The sorghum root exudates also contained sorgolactone as a minor stimulant.[table]
植物化学調節学会の論文
2002-10-31