Zeatin

Occurrence, chemistry, synthesis and cytokinin activity of l -methyl-rran.s-zeatin and its analogs (glycosylated adenine derivatives) 97H(46)659. 

Tables VIII and IX show responses of hydrilla explants to various plant growth regulators and to solstitialin. GA3, BA and solstitialin enhanced elongation at 10-4 or 10 5 M. Zeatin, on the other hand, dramatically increased new shoot initiation in apical explants but had little effect on 2-node explants.

Effect of ABA and Zeatin on New Shoot Production from Apical Shoots and Two-node Sections of Hydrilia verticillata3... 

Zeatin Derivative of purine. There are other similar purines controlling cell activities... 

Isolated from plants Lupinic acid - metabolite of the 13 cytokinin zeatin... 

This enzyme ]EC 4.2.99.13], also known as lupinic acid synthase, catalyzes the reaction of O-acetyl-L-serine with zeatin to produce lupinate and acetate. Zeatin is N -(4-hydroxy-3-methyl-butyl-iran5 -2-enylamino)purine. A number of other A -substituted purines can function as substrates for this enzyme. 

This enzyme [EC 2.4.1.118], also known as UDP-glucose-zeatin 7-glucosyltransferase, catalyzes the reaction of UDP-glucose with an A -alkylaminopurine to produce UDP and an A -alkylaminopurine-V-jS-D-glucoside. The enzyme can act on a number of -substituted adenine derivatives (e.g., zeatin and A -benzylaminopurine). However, it has been reported that A -benzyladenme does not serve as a substrate. Depending on the substrate, a 9-/3-D-glucoside may be the product formed. 

This enzyme [EC 1.1.1.242] catalyzes the reversible reaction of dihydrozeatin with NADP+ to produce zeatin and NADPH. 

SHIKIMATE DEHYDROGENASE SULFITE REDUCTASE VALINE DEHYDROGENASE ZEATIN aS-TRANS ISOMERASE NADPH DEHYDROGENASE NAD(P)H DEHYDROGENASE (QUINONE) NADPH-dependent enzymes, ACYL-ACYL-CARRIER-RROTEIN -DESA-TURASE... 

ZEATIN CIS-TRANS ISOMERASE ZEATIN REDUCTASE ZEOLITE ZERO ORDER... 

P-D-galactopyranosy 1- (1 —>2) -a-galactopyranosyl-( 1—>3)-a-L-arabinofuranosyl]-4-0-(a-L-arabino-furanosyl)-(3- D- galac topyranosyl) - trans -zeatin-ribos ide ... 

Other cytokinins discovered in microoiganisms include trans-zeatin, /nmf-zeatin riboside, and 6-(4-hydroxy-l,3-dimethylbut-/ra. f-2-enylamino)-9-p-D-ribofuranosylpurine (4), a new cytokinin from the phytopathogenic bacterium Pseudomonas syringae pr. savastanoi, that causes olive knot and galls on stems of ash, jasmine, oleander, and privet. 

Zearalenone growth promotant veterinary use, 1, 219 ( )-Zearalenone synthesis, 1, 479 Zeatin... 

In fact, kinetin was not the natural cell division hormone, although as an adenine derivative it is chemically closely related to the native kinins that have been isolated from plant sources. It was D. S. Letham in New Zealand (1967) who first succeeded with a crystalline cytokinin isolated from the milky stage of immature maize (Zea mays) kernels. It was 6-substituted iso-pentenylamino purine (N6-(A2-isopentenyl)) adenosine (Figure 2d). He called the substance zeatin, and zeatin riboside was, in fact, the major active constituent of coconut milk (Letham, 1974). 

Cooper JB, Long SR. 1994. Morphogenetic rescue of Rhizobium meliloti nodulation mutants by trans-zeatin secretion. Plant Cell 6 215-225. 

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