Zeatin: Difference between revisions

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Line 3: \| Watchedfields = changed \| verifiedrevid = 439270934 \| ImageFile = Trans-Zeatin Structural Formula V.~~png~~1.svg \| ImageSize = 150px \| IUPACName = (''E'')-2-methyl-4-(7''H''-purin-6-ylamino)but-2-en-1-ol Line 59: Zeatin can also be applied to stimulate seed germination and seedling growth. Zeatin has also been shown to promote the resistance of [[tobacco]] against the bacterial [[pathogen]] ''[[Pseudomonas syringae]]'', in which ''trans''-zeatin has a more prominent effect than ''cis''-zeatin. <ref>{{cite journal\|author1= Großkinsky, D.K. \|author2=Edelsbrunner, K. \|author3=Pfeifhofer, H. \|author4=van der Graaff, E. \|author5=Roitsch, T. \|name-list-style=amp \|title= Cis- and trans-zeatin differentially modulate plant immunity. \|journal= Plant Signaling & Behavior \|volume=8 \|year=2013\|doi=10.4161/psb.24798\|pmid=23656869\|issue=7\|pages=e24798 \|pmc=3906432 \|bibcode=2013PlSiB...8E4798G }}</ref> The two isomers of Zeatin are found to have different effects biologically, as trans-zeatin is found to be bioactive while cis-zeatin has a weak impact. This distinct bioactivity is not a result of difference in uptake and accumulation of trans-Zeatin as opposed to cis-Zeatin.<ref>{{Cite journal \|last1=Gajdošová \|first1=Silvia \|last2=Spíchal \|first2=Lukáš \|last3=Kamínek \|first3=Miroslav \|last4=Hoyerová \|first4=Klára \|last5=Novák \|first5=Ondřej \|last6=Dobrev \|first6=Petre I. \|last7=Galuszka \|first7=Petr \|last8=Klíma \|first8=Petr \|last9=Gaudinová \|first9=Alena \|last10=Žižková \|first10=Eva \|last11=Hanuš \|first11=Jan \|last12=Dančák \|first12=Martin \|last13=Trávníček \|first13=Bohumil \|last14=Pešek \|first14=Bedřich \|last15=Krupička \|first15=Martin \|date=May 2011 \|title=Distribution, biological activities, metabolism, and the conceivable function of cis-zeatin-type cytokinins in plants \|url=https://academic.oup.com/jxb/article-lookup/doi/10.1093/jxb/erq457 \|journal=Journal of Experimental Botany \|language=en \|volume=62 \|issue=8 \|pages=2827–2840 \|doi=10.1093/jxb/erq457 \|pmid=21282330 \|issn=1460-2431 \|access-date=December 7, 2023}}</ref> In the tobacco callus bioassay, cis-Zeatin was found to be less active than trans-Zeatin. There is no evidence of cis↔trans isomerization in plant tissues.<ref>{{Cite journal \|last=Jameson \|first=Paula Elizabeth \|date=2023-05-02 \|title=Zeatin: The 60th anniversary of its identification \|url=https://academic.oup.com/plphys/article/192/1/34/7039312 \|journal=Plant Physiology \|language=en \|volume=192 \|issue=1 \|pages=34–55 \|doi=10.1093/plphys/kiad094 \|issn=0032-0889 \|pmc=10152681 \|pmid=36789623}}</ref> == References == Line 65 ⟶ 67: == External links == * [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Cytokinins.html Cytokinins] {{Webarchive\|url=https://web.archive.org/web/20060217212642/http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Cytokinins.html \|date=2006-02-17 }} [[Category:Cytokinins]] [[Category:Purines]] [[Category:Aging-related substances in plants]] [[Category:Plant growth regulators]]