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Zeatin

About: Zeatin is a research topic. Over the lifetime, 2467 publications have been published within this topic receiving 64092 citations. The topic is also known as: Zeatin & (E/Z)-zeatin.


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Journal ArticleDOI
TL;DR: The content of cytokinins especially zeatin nucleotide decreased in shoots as a result of temperature increase and accumulated in roots, followed by a decline of evapotranspiration after its initial temperature-induced uprising.
Abstract: The content of cytokinins especially zeatin nucleotide decreased in shoots as a result of temperature increase. Simultaneously the cytokinins accumulated in roots. The changes in cytokinins distribution were followed by a decline of evapotranspiration after its initial temperature-induced uprising.

16 citations

Journal Article
TL;DR: It was found that the application of a combination of cytokinin and 0.5 microM GA3 from day zero was the most appropriate for obtaining vigorously growing plantlets following LN immersion and proved to be more effective than basal medium, zeatin or kinetin treatments.
Abstract: Studies on the effects of plant growth regulators (PGRs) on survival, recovery and post-recovery growth of shoot apices following cryopreservation are limited. In this study, the effects of plant growth regulators in both the culture phase and the recovery phase of cryostorage were examined for the rare plant species, Anigozanthos viridis ssp terraspectans Hopper. Survival of shoot apices was not correlated to cytokinin or auxin treatments administered in culture media prior to cryostorage. In recovery media, the plant growth regulators, kinetin, zeatin (cytokinins), IAA, (auxin) and GA3 were examined for their effect following cryopreservation. It was found that the application of a combination of cytokinin and 0.5 microM GA3 from day zero was the most appropriate for obtaining vigorously growing plantlets following LN immersion. This combination proved to be more effective than basal medium, zeatin or kinetin treatments.

16 citations

Journal ArticleDOI
TL;DR: The ability of ectomycorrhizal fungi to affect host cytokinin relations was not dependent upon an ability to synthesize cytokinins in pure culture, and results are discussed in relation to improved mineral nutrition, enhanced root growth, and increased short-root proliferation in the ectomy corollary association.
Abstract: SUMMARY Seven ectomycorrhizal fungi were screened by a soybean cell division bioassay to determine their potential for cytokinin synthesis. Fungal isolates of Rhizopogon roseolus (Corda) Hollos and Suillus punctipes (Peck) Sing, released significant quantities of cytokinin-like substances into the culture medium. In contrast, Cenococcum geophilum (Fr.), Hebeloma crustuliniforme (Bull. ex. St. Amans) Qual., Pisolithus tinctorius (Pers.) Coker and Couch, Suillus granulatus (L. ex. Fr.) O. Kuntze, and Thelephora terrestris (Ehrh.) Fr. failed to elicit a positive cytokinin response in the soybean bioassay. Purification of S. punctipes culture filtrates by cation exchange, organic solvent partitioning, and separation on Sephadex LH-20 revealed the presence of compounds with the same retention volume as zeatin and zeatin riboside. Greenhouse studies with loblolly pine (Pinus taeda L.) indicated that, together with improved plant growth and enhanced mineral nutrition, P. tinctorius mediated a significant effect on host cytokinin relations. Cytokinin activity of extracted needles increased 44 and 30% for 12- and 14-month-old seedings, respectively, following ectomycorrhizal establishment. Axenically grown seedlings colonized by 5. punctipes showed no alterations in growth, nutrition, or cytokinin concentration, compared to non-inoculated controls, even though mycorrhizal formation exceeded 30%. The ability of ectomycorrhizal fungi to affect host cytokinins was not dependent upon an ability to synthesize cytokinins in pure culture. Results are discussed in relation to improved mineral nutrition, enhanced root growth, and increased short-root proliferation in the ectomycorrhizal association.

16 citations

Journal ArticleDOI
TL;DR: Results show that spinach somatic embryogenesis is most facilitated by NAA combined with GA3, with low frequency of somatic embryo formation shown on culture media containing auxins combined with natural cytokinins.
Abstract: To establish a plant-regenerating system through frequent somatic embryogenesis, a detailed investigation was undertaken on the effects of kinds, concentrations, and combinations of growth regulators on callus and somatic embryo formation from spinach root segments. Although no somatic embryogenesis occurred on the culture medium containing auxins alone, a low frequency of somatic embryo formation was shown on culture media containing auxins combined with natural cytokinins, namely 10 μM NAA with 10 μM zeatin, 30 μM NAA with 10 μM 2-iP, and 1μM 2.4-D with 0.1 μM zeatin or 10μM 2-iP. Somatic embryos also formed on culture madia containing auxins combined with GA3. From 50 to 70% of the root segment differentiated somatic embryos on culture media containing 10 to 30 μM NAA combined with 1 to 100 μM GA3. These results show that spinach somatic embryogenesis is most facilitated by NAA combined with GA3.

16 citations

Journal ArticleDOI
TL;DR: In this paper, a comparison of trans-zeatin, cis-izatin and (±)-dihydrozeatin was conducted in the soybean callus bioassay.
Abstract: 6-(2,3,4-Trihydroxy-3-methylbutylamino)purine was identified as an oxidation product of cis-zeatin and is biologically as active as the parent compound. A comparison of trans-zeatin, cis-zeatin and (±)-dihydrozeatin indicated that trans-zeatin and (±)-dihydrozeatin were more active in the soybean callus bioassay than cis-zeatin. Both the trans- and cis-isomers of zeatin did, however, give an optimum response at 10-5M. Dihydrozeatin was more active at concentrations of 10-6 and 10-5M than trans-zeatin. The significance of the formation of 6-(2,3,4-trihydroxy-3-methylbutylamino)purine with respect to stereochemistry and the oxidation of cytokinins with an unsaturated isopentenyl side chain is discussed.

16 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202333
2022103
202135
202034
201932
201848