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- W1980236883 abstract "Abstract Here we have examined the composition of free sterols and steryl esters of pollen from selected angiosperm species, as a first step towards a comprehensive analysis of sterol biogenesis in the male gametophyte. We detected four major sterol structural groups: cycloartenol derivatives bearing a 9β,19‐cyclopropyl group, sterols with a double bond at C‐7(8), sterols with a double bond at C‐5(6), and stanols. All these groups were unequally distributed among species. However, the distribution of sterols as free sterols or as steryl esters in pollen grains indicated that free sterols were mostly Δ 5 ‐sterols and that steryl esters were predominantly 9β,19‐cyclopropyl sterols. In order to link the sterol composition of a pollen grain at anthesis with the requirement for membrane lipid constituents of the pollen tube, we germinated pollen grains from Nicotiana tabacum , a model plant in reproductive biology. In the presence of radiolabelled mevalonic acid and in a time course series of measurements, we showed that cycloeucalenol was identified as the major neosynthesized sterol. Furthermore, the inhibition of cycloeucalenol neosynthesis by squalestatin was in full agreement with a de novo biogenesis and an apparent truncated pathway in the pollen tube." @default.
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- W1980236883 date "2015-03-28" @default.
- W1980236883 modified "2023-10-12" @default.
- W1980236883 title "Plant Sterol Diversity in Pollen from Angiosperms" @default.
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- W1980236883 doi "https://doi.org/10.1007/s11745-015-4008-x" @default.
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