Abstract
Sterol contents of Nicotiana suaveolens (Lehm), N. langsdorffii (Weinm.) and their spontaneous-tumoring hybrid were compared when plants of both species and the hybrid began flowering, and again after numerous tumours had developed spontaneously on the hybrid plants. In general, the upper plant parts (younger tissues) had higher sterol contents than did the lower plant parts (older tissues) at both sampling dates. β-Sitosterol was the most abundant sterol in the above ground portions while stigmasterol was most abundant in roots. Low cholesterol and high campesterol levels were found in N. suaveolens in contrast with high cholesterol and low campesterol in N. langsdorffii. Levels of cholesterol and campesterol in the hybrid were intermediate between the parental species. Low cholesterol and high campesterol contents were found in tumours of the hybrid, and in roots of both of the parental species and the hybrid.
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