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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 hypothesis that CKI-1 is involved in cytokinin perception is supported and the existence of a feedback loop altering cytokinIn metabolism in response to the level of receptor abundance is demonstrated.

16 citations

Journal ArticleDOI
TL;DR: It is suggested that in the presence of a functional root system lateral buds do not synthesize cytokinins de novo, but that they do have the metabolic capacity to convert cytokinin transported to them.
Abstract: Girdling of 1-year-old Salix babyionica L. plants resulted in an early accumulation of compounds which co-chromatographed with cytokinin glucosides in both the bark and buds below the girdle. In the bark the cytokinin glucosides were present in high levels in both girdled and non-girdled plants. In the buds of non-girdled plants. however, glucoside concentration was initially low but then increased rapidly after ringing and reached a maximum level prior to any visible signs of bud swell. With the onset of lateral shoot growth the glucoside cytokinins decreased while the cytokinins that co-chromatographed with zeatin and its derivatives increased. As the cytokinin glucosides are generally considered to be storage forms, their accumulation in the bark and buds below the girdle apparently does not reflect synthesis but rather transport towards a more competitive sink. In the case of Salix plants the lateral buds would appear to have the ability to hydrolyze these glucosylated zeatin derivatives and then to utilize them for bud development. It is suggested that in the presence of a functional root system lateral buds do not synthesize cytokinins de novo, but that they do have the metabolic capacity to convert cytokinins transported to them.

16 citations

Journal ArticleDOI
TL;DR: A procedure for in vitro propagation of roseroots (Rhodiola rosea L), a medicinal plant, was developed using a RITA bioreactor system containing liquid medium, combined with a gelled medium to support rapid shoot proliferation and induced hyperhydricity.
Abstract: A procedure for in vitro propagation of roseroots (Rhodiola rosea L), a medicinal plant, was developed using a RITA bioreactor system containing liquid medium, combined with a gelled medium. Wild roseroot clones: ‘RCi’, ‘RC2’ and ‘RC3’ were established on a basal medium (BM) from in vitro-germinated seedlings on half-strength Murashige and Skoog (MS) salts. TDZ at 2–4 μM supported shoot proliferation but inhibited shoot elongation of ‘RCi’ shoots on gelled medium. Clones differed significantly with respect to multiplication rate with ‘RCi’ producing the most shoots per explant on gelled BM with 2 μM zeatin. In a bioreactor system, TDZ supported rapid shoot proliferation at lower concentration (0.5 μM) but induced hyperhydricity at more than 0.5 μM. Bioreactor-multiplied hyperhydric shoots of all clones when transferred to gelled medium containing 1–2 μM zeatin produced normal shoots within 4 wk of culture. Shoots were rooted in vitro on BM void of growth regulators. Almost all (9U to 95%) in vitro plantlets survived when transferred to potting medium.

16 citations

Journal ArticleDOI
TL;DR: It was observed that the IAA, zeatin and ABA levels in the leaf were high in the first year, and was low in the second year, while the annual GA3 levels were lower in the ‘on’ year and higher in the alternate bearing, ‘off’year.
Abstract: This research was carried out in order to observe seasonal changes of internal plant growth regulators in pistachio. This research was conducted during three years at a commercial pistachio orchard located in FA±rat valley in Nizip, Gaziantep. ‘KA±rmA±zA±’ pistachio cultivar trees grafted on Pistacia vera L. were used as plant material. Changes in auxin (IAA), cytokinin (Zeatin), gibberellin (GA3) and abscisic acid (ABA) were observed in leaves in May, July and September of the first (heavy cropping year - 'on'-year) and second (subsequent light cropping year ' off '-year) years. Besides, yield and flower bud abscission rate were observed during three years to determine the relationships among the level of plant growth regulator, yield and flower bud abscission. It was observed that the IAA, zeatin and ABA levels in the leaf were high in the first year, and was low in the second year. The annual GA3 levels were lower in the ‘on’ year and higher in the alternate bearing, ‘off’ year. The correlation analysis between the hormones and fruit bud abscission rates showed that increase in the ABA levels caused also increase in fruit bud abscission at all months in the first year. Key words: Auxin, zeatin, gibberellic acid, abscisic acid, pistachio.

16 citations

Journal ArticleDOI
TL;DR: Principal component analysis (PCA) revealed that growth and SNF parameters under salinity were inversely correlated to the amount of reduced nitrogen allocated to the roots and nodules, to the sucrolytic activity in the roots, and to the t -Z and ABA concentration in the nodules.

16 citations


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