3 结果
Sixty-one sterols and pentacyclic triterpenes have been isolated and characterized by chromatographic and spectral methods from Zea mays (corn). Several plant parts were examined; seed, pollen, cultured hypocotyl cells, roots, coleoptiles (sheaths), and blades. By studying reaction pathways and
Microsomes isolated from corn embryos (Zea mays) were shown to catalyse the C-4 monodemethylation of 28-[3H],24-methylene cycloartanol 1, leading to the corresponding 4 alpha-methyl sterol, cycloeucalenol 5. An enzymatic assay has been developed for the 4,4-dimethyl sterol 4-demethylase in higher
9beta, 19-Cyclopropyl sterols such as 24-methyl pollinastanol accumulate dramatically in maize (Zea mays L. var LG 11) seedlings treated with Tridemorph (2,6-dimethyl-N-tridecyl-morpholine), a systemic fungicide (M. Bladocha, P. Benveniste, Plant Physiol 1983 41: 756-762). In contrast to the