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Gibberellic acid degradation

Gibberellic acid, C19H2206 (I) is a monobasic acid of pK 4.0. With dilute mineral acid at 20° C. (4) it gives allogibberic acid (II) which with acid at 100° C. yields gibberic acid (III). Structures of these two important degradation products have been conclusively established by us. The evidence has been published in full (II, 26) and it is not dealt with here. [Pg.4]

Bioassay procedures for the determination of gibberellic acid have been developed (2, 5), but more recent chemical fluorometric assay methods are equally specific. However, both assay methods show a low response with samples containing less than 10 /x/xg. of the gibberellins. Consequently, in determining residual amounts within the part per billion (p.p.b.) range, relatively large samples must be extracted and extracts partially purified to satisfy the assay conditions. These operations are usually accompanied by some material losses or degradation, which impair quantitative interpretation of the results. Natural inhibitors can influence the results in the bioassay method (2), and fluorescent contaminants can interfere with the spectrophotometric analysis. [Pg.116]

The gibberellic acid-induced biosynthesis and release of cell-wall degrading e/jrfo-D-xylanase by isolated aleurone layers of barley have been studied. Studies on the D-xylanase system of Streptomyces species have included a study of the action of the enzyme on various o-xylans and D-xylo-oligosaccharides. The isolation and structural identification of arabino-D-xylo-oligosaccharides arising from action of the enzyme on corn cob arabino-D-xylan were reported. Mutant strains of Trichoderma viride not producing D-xylanase have been induced and isolated with the aid of nystatin selection. ... [Pg.469]

The development of amylase activity in extracts of embryo-free and of GA3-treated, embryo-free maize kernels has been determined. The increase in amylase activity was accompanied by the appearance of several starch-degrading enzymes. Actinomycin D and cycloheximide prevented the amylolytic activity from developing. Other results indicated that the development of a-amylase activity in embryo-free maize kernels does not depend on gibberellic acid, but involves the de novo synthesis of protein. [Pg.369]

Gibberellins are mainly responsible for triggering the synthesis of key enzymes that will degrade nntrients stored in the first and second reserve tissues of the germ and endosperm, respectively. Two gibberellic acids (GA, and GA3) are the major hormones produced by the anbryo. These hormones are later transported along with the absorbed water to the endosperm through the tube cells, and induce aleurone cells... [Pg.123]


See other pages where Gibberellic acid degradation is mentioned: [Pg.362]    [Pg.7]    [Pg.10]    [Pg.10]    [Pg.69]    [Pg.21]    [Pg.199]    [Pg.97]    [Pg.97]    [Pg.97]    [Pg.98]    [Pg.16]    [Pg.387]    [Pg.158]    [Pg.92]    [Pg.158]    [Pg.159]    [Pg.54]    [Pg.204]    [Pg.257]    [Pg.259]    [Pg.419]    [Pg.270]    [Pg.29]   


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