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Leaflets and pieces of immature stem of Hevea brasiliensis weretreated with a range of compounds, and the subsequent ratesof release of ethylene compared with the reported efficacy ofthe individual substances as stimulants of latex yield. Themost effective ethylene inducers were also the best stimulants.Amongst the 53 compounds tested, no compound which was not ayield stimulant induced the formation of significant amountsof ethylene. Of all the known stimulants tested, only acetylenewas neither converted to, nor induced the formation of ethylene. 相似文献
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New aspects of rubber biosynthesis 总被引:5,自引:0,他引:5
BERNARD L. ARCHER BRAIN G. AUDLEY 《Botanical journal of the Linnean Society. Linnean Society of London》1987,94(1-2):181-196
New aspects of rubber biosynthesis. Following a review of the site of rubber biosynthesis in Hevea brasiliensis and Parthenium argentalum, evidence is given for the initiation of polyisoprene molecules from (ranMerpenoid precursors including geranylgeranyl pyrophosphate. All franj-14 C-geranylgeraniol has been isolated from incubations of H. brasiliensis latex serum with 14 C-isopentenyl pyrophosphate. Gel-filtration chromatography of the serum yields very small rubber particles of high biosynthetic activity, and two proteinaceous fractions. One of these increases the biosynthesis of rubber and may contain the enzyme, isopentenyldiphosphate δ-isomerase, whilst the other appears to inhibit rubber formation. The nature and molecular weight of the rubber formed in vitro is discussed and a mechanism for the de novo formation of rubber particles is suggested. 相似文献
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Suspension cultures of Hevea brasiliensis cells can metabolizethe growth regulator 2-chloroethylphosphonic acid to producea number of compounds, one of which appears to be an acid-labileconjugate. The general metabolic pattern closely resembles thatfound previously using Hevea leaves. Evidence that the compoundsformed are not chromatographic artefacts of a type describedby other authors is presented. 相似文献
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