Talk:Cytokinin

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Does anyone know whether or not Cytokinin is really used in the Opening and closing of the Stomata in plants? Or does it still remain just a theory?

Jun ('06): actually, no, cytokinins aren't involved in stomatal openings etc. stomatal openings etc are controlled by abscisic acid, which is part of potassium chloride threory, where abscisic acid causes the movement of potassium ions into the guard cells, drawing water into it via osmosis.

Matt ('06): Listen to Jun. He knows his stuff. =D

Hello! I believe we could add a section to this article related to Cytokinin Signaling in plants. I could add this section in a few days if there is no opposition? If you would like to check over what I post, please check back and feel free to make further edits to it! April 19th, 2016. — Preceding unsigned comment added by ESK6989 (talk • contribs) 16:43, 19 April 2016 (UTC)[reply]

Discovery

The discovery of Cytokinins dates back to 1921, when an Austrian Plant Physiologist, G. Haberlandt discovered that vascular tissues of various plants contained an unknown diffusible factor, which stimulated cell division, Johannes Van Overbeek found that milky endosperm of immature coconut also had this factor which stimulated cell division and differentiation in very young Datura embryos.

Jablonski and Skoog (1954) extended the work of Haberlandt and reported that a substance present in the vascular tissue was responsible for causing cell division in the pith cells. Miller and his co-workers (1954) isolated and purified the cell division substance in crystallized form. from autoclaved herring fish sperm DNA This active compound was named as Kinetin because of its ability to promote cell division and was the first Cytokinin to be named. Kinetin was later on identified to be 6-furfuryl-amino purine. Later on the generic name kinin was suggested to include kinetin and other substances having similar properties.

The first naturally occurring cytokinin was isolated and crystallized simultaneously by Miller und D.S. Lethum (1963-65) from the milky endosperm of corn (Zea mays) and named as Zeatin. Lethem ((1963) proposed the term Cytokinins for such substances. EarthDragon (talk) 12:00, 15 May 2022 (UTC)[reply]

Certainly I agree that the text and source you removed were incorrect. The source only superficially appeared related to the text. However neither ^[1](which is already here) nor ^[2] mentions Haberlandt, and ^[3] doesn't describe Haberlandt as the discoverer. Also please give more specific citations - this cite^[2] will provide some of them for you (Miller and coworkers 1954, and Letham and Miller 1965, etc). Invasive Spices (talk) 15 May 2022 (UTC)

References

^ Sakakibara, Hitoshi (2006-06-01). "Cytokinins: Activity, Biosynthesis, and Translocation". Annual Review of Plant Biology. 57 (1). Annual Reviews: 431–449. doi:10.1146/annurev.arplant.57.032905.105231. ISSN 1543-5008. PMID 16669769. S2CID 25584314.
^ ^a ^b Amasino, Richard (2005-07-01). "1955: Kinetin Arrives. The 50th Anniversary of a New Plant Hormone". Plant Physiology. 138 (3). American Society of Plant Biologists (OUP): 1177–1184. doi:10.1104/pp.104.900160. ISSN 1532-2548. PMC 1176392. PMID 16009993. S2CID 39799168.
^ Sugiyama, Munetaka (2015-03-01). "Historical review of research on plant cell dedifferentiation". Journal of Plant Research. 128 (3). Botanical Society of Japan (Springer): 349–359. doi:10.1007/s10265-015-0706-y. ISSN 0918-9440.

[Sakakibara-2006-1] Sakakibara, Hitoshi (2006-06-01). "Cytokinins: Activity, Biosynthesis, and Translocation". Annual Review of Plant Biology. 57 (1). Annual Reviews: 431–449. doi:10.1146/annurev.arplant.57.032905.105231. ISSN 1543-5008. PMID 16669769. S2CID 25584314.

[Amasino-2005-2] Amasino, Richard (2005-07-01). "1955: Kinetin Arrives. The 50th Anniversary of a New Plant Hormone". Plant Physiology. 138 (3). American Society of Plant Biologists (OUP): 1177–1184. doi:10.1104/pp.104.900160. ISSN 1532-2548. PMC 1176392. PMID 16009993. S2CID 39799168.

[Sugiyama-2015-3] Sugiyama, Munetaka (2015-03-01). "Historical review of research on plant cell dedifferentiation". Journal of Plant Research. 128 (3). Botanical Society of Japan (Springer): 349–359. doi:10.1007/s10265-015-0706-y. ISSN 0918-9440.

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