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By Chelston W. D Brathwaite

ISBN-10: 9290390131

ISBN-13: 9789290390138

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This increase in the ratio of RNA polymerase I to II is to a large extent maintained following solubilization and DEAE cellulose fractionation of the RNA polymerases from nuclei of normal and auxintreated mature tissue (42, 43). We have also observed that the level of "soluble" (not pelleted in the chromatin or nuclear fractions) RNA polymerase II does not change significantly in the mature tissue following auxin treatment (42). Auxin treatment has an opposite effect on RNA synthesis in zone A compared to zone B.

Fig . 10 2 I! 54 T. L. KEY the nuclei and fractionated on DEAE cellulose, the relative activities of RNA polymerase I and II are similar to those observed in the nuclei. The level of solubilized RNA polymerase I is 2- to 3-fold higher in zone A than in zone B while the level of solubilized RNA polymerase II is similar between the two zones. The large decrease in RNA polymerase I during the growth transition from the meristematic to the mature state shows a positive correlation with the change in the relative level of in vivo rRNA synthesis which occurs during this transition.

L. KEY migrate as single bands on 5% acry1amide gels electrophoresed under nondenaturing conditions. If enzymes IIa and lIb are electrophoresed together, they migrate as two distinct bands. Subsequent re-electrophoresis of the "native" bands under denaturing conditions and analysis of the subunits reveals that RNA polymerase lIb migrates faster than IIa on the "native" gels (Fig. 7). 75 to 15% acry1amide gradient is shown in Fig. 7 A and B. These SDS gels indicate that RNA polymerase IIa differs from lIb only with respect to its largest subunit (Fig.

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An Introduction to the Diagnosis of Plant Disease by Chelston W. D Brathwaite


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