A steroid factor in pea ( Pisum sativum L.) influencing growth and sporulation of Phytophthora cinnamomi Rands

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Abstract
Steroid constituents of garden peas ( Pisum sativum L.) were isolated using thin‐layer chromatography, and their steroidal nature was confirmed by precipitation as the digitonide. The fraction having the same Rf as cholesterol and β‐sitosterol promoted abundant vegetative growth and prolific sporulation of Phytophthora cinnamomi Rands. The steroids cholesterol, ergosterol, β‐sitosterol, and stigmasterol stimulated growth and sporulation. Cholic acid, calciferol, mevalonic acid, and desoxycholic acid stimulated to a limited extent or had no effect.