CREam of cytokinin signalling: receptor identified

Schmülling, Thomas

doi:10.1016/s1360-1385(01)02011-8

Cited by 35 publications

(15 citation statements)

References 27 publications

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“…The function of AHKs as CK receptors was proved by heterologous complementation of His kinase-dependent pathways of yeast (Inoue et al 2001;Ueguchi et al 2001a;Suzuki et al 2001) and bacteria Yamada et al 2001) mutants engineered to express CK receptors and for easy scoring of the CK response (reviewed in Schmülling 2001). Expression of CRE1/AHK4, AHK3 and AHK2-CHASE-TM (AHK2-CHASE including the two adjacent transmembrane domains) in Escherichia coli DrcsC and cps::lacZ mutant strains producing b-galactosidase in reaction to CK , and direct receptor binding assays (Romanov et al 2005) were used for molecular and biochemical characterisation of the receptors Yamada et al 2001;Spíchal et al 2004;Romanov et al 2006).…”

Section: Ck Perception and Signal Transductionmentioning

confidence: 99%

Cytokinins - recent news and views of evolutionally old molecules

Spíchal¹

2012

Functional Plant Biol.

156

169

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Cytokinins (CKs) are evolutionally old and highly conserved low-mass molecules that have been identified in almost all known organisms. In plants, they evolved into an important group of plant hormones controlling many physiological and developmental processes throughout the whole lifespan of the plant. CKs and their functions are, however, not unique to plants. In this review, the strategies and mechanisms of plants – and phylogenetically distinct plant-interacting organisms such as bacteria, fungi, nematodes and insects employing CKs or regulation of CK status in plants – are described and put into their evolutionary context. The major breakthroughs made in the last decade in the fields of CK biosynthesis, degradation and signalling are also summarised.

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Section: Ck Perception and Signal Transductionmentioning

confidence: 99%

Cytokinins - recent news and views of evolutionally old molecules

Spíchal¹

2012

Functional Plant Biol.

156

169

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“…Early leaf senescence due to cytokinin deficiency could have been anticipated in view of the stimulatory activity of cytokinins in de-etiolation and their ability to postpone leaf senescence (Gan and Amasino 1995). It was concluded that lowering the cytokinin level beyond a threshold does not trigger the onset of senescence (Schmülling 2001). Another surprising result was the fact that, in contrast to vegetative tissues, cell division, cell size and morphogenesis of flowers was not altered in CKX overexpressers.…”

Section: Ckx Genes As a Tool For Studying Cytokinin Functionsmentioning

confidence: 99%

Structure and function of cytokinin oxidase/dehydrogenase genes of maize, rice, Arabidopsis and other species

et al. 2003

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Cytokinin oxidases/dehydrogenases (CKX) catalyze the irreversible degradation of the cytokinins isopentenyladenine, zeatin, and their ribosides in a single enzymatic step by oxidative side chain cleavage. To date the sequences of 17 fully annotated CKX genes are known, including two prokaryotic genes. The CKX gene families of Arabidopsis thaliana and rice comprise seven and at least ten members, respectively. The main features of CKX genes and proteins are summarized in this review. Individual proteins differ in their catalytic properties, their subcellular localization and their expression domains. The evolutionary development of cytokinin-catabolizing gene families and the individual properties of their members indicate an important role for the fine-tuned control of catabolism to assure proper regulation of cytokinin functions. The use of CKX genes as a tool in studies of cytokinin biology and biotechnological applications is discussed.

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“…Several recently discovered components of the cytokinin-signaling pathway (22,23) and the cytokininresponse phenotype of auxin mutants (24,25) show that these two groups of plant hormones indeed ''cross talk'' on the molecular level. The aim of the present study was to investigate the true nature of the interaction on the homeostatic level between these two hormones.…”

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Auxin regulation of cytokinin biosynthesis in Arabidopsis thaliana : A factor of potential importance for auxin–cytokinin-regulated development

Nordström

Tarkowski

Tarkowská

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

510

397

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One of the most long-lived models in plant science is the belief that the long-distance transport and ratio of two plant hormones, auxin and cytokinin, at the site of action control major developmental events such as apical dominance. We have used in vivo deuterium labeling and mass spectrometry to investigate the dynamics of homeostatic cross talk between the two plant hormones. Interestingly, auxin mediates a very rapid negative control of the cytokinin pool by mainly suppressing the biosynthesis via the isopentenyladenosine-5 -monophosphate-independent pathway. In contrast, the effect of cytokinin overproduction on the entire auxin pool in the plant was slower, indicating that this most likely is mediated through altered development. In addition, we were able to confirm that the lateral root meristems are likely to be the main sites of isopentenyladenosine-5 -monophosphate-dependent cytokinin synthesis, and that the aerial tissue of the plant surprisingly also was a significant source of cytokinin biosynthesis. Our demonstration of shoot-localized synthesis, together with data demonstrating that auxin imposes a very rapid regulation of cytokinin biosynthesis, illustrates that the two hormones can interact also on the metabolic level in controlling plant development, and that the aerial part of the plant has the capacity to synthesize its own cytokinin independent of long-range transport from the root system.

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CREam of cytokinin signalling: receptor identified

Cited by 35 publications

References 27 publications

Cytokinins - recent news and views of evolutionally old molecules

Cytokinins - recent news and views of evolutionally old molecules

Structure and function of cytokinin oxidase/dehydrogenase genes of maize, rice, Arabidopsis and other species

Auxin regulation of cytokinin biosynthesis in Arabidopsis thaliana : A factor of potential importance for auxin–cytokinin-regulated development

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