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Expression data from Arabidopsis thaliana senescent leaves treated with cytokinins

ABSTRACT: Cytokinins are plant hormones with biological functions ranging from coordination of plant growth and development to the regulation of senescence. A series of 2-chloro-N6-(halogenobenzylamino)purine ribosides was prepared and tested for cytokinin activity in selected bioassays. Several compounds showed significant activity, especially in delaying senescence in detached wheat leaves. We used microarrays to gather information about the reprogramming of gene transcription when senescent Arabidopsis leaves were treated with selected C2-substituted aromatic cytokinin ribosides that showed high activity in the senescence bioassay. Arabidopsis senescent leaves were treated with cytokinins and subsequently used for RNA extraction and hybridization on Affymetrix microarrays. 21-days old Arabidopsis leaves were treated with the appropriate cytokinin or left untreated (DMSO only).

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Maria Majeska Cudejkova

PROVIDER: E-GEOD-75875 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Expression data from Arabidopsis thaliana senescent leaves treated with cytokinins

Project description:Cytokinins are plant hormones with biological functions ranging from coordination of plant growth and development to the regulation of senescence. A series of 2-chloro-N6-(halogenobenzylamino)purine ribosides was prepared and tested for cytokinin activity in selected bioassays. Several compounds showed significant activity, especially in delaying senescence in detached wheat leaves. We used microarrays to gather information about the reprogramming of gene transcription when senescent Arabidopsis leaves were treated with selected C2-substituted aromatic cytokinin ribosides that showed high activity in the senescence bioassay.

2015-12-11 | GSE75875 | GEO

A time series of autumn senescence leaves from populus tremula

Project description:A gene expression analysis of the changes in in popolulus tremula during the autumn sensencece. Leaves were analyzed from late summer and late into autumn. Cytokinins are plant hormones that typically block or delay leaf senescence. We profiled 34 different cytokinins/cytokinin metabolites (including precursors, conjugates and degradation products) in leaves of a free-growing mature aspen (Populus tremula) before and after the initiation of autumnal senescence over three consecutive years. The levels and profiles of individual cytokinin species, or classes/groups, varied greatly between years, despite the fact that the onset of autumn senescence was at the same time each year, and senescence was not associated with depletion of either active or total cytokinin levels. Levels of aromatic cytokinins (topolins) were low and changed little over the autumn period. Diurnal variations and weather-dependent variations in cytokinin content were relatively limited. We also followed the expression patterns of all aspen genes implicated as having roles in cytokinin metabolism or signaling, but neither the pattern of regulation of any group of genes nor the expression of any particular gene supported the notion that decreased cytokinin signaling could explain the onset of senescence. Based on the results from this tree, we therefore suggest that cytokinin depletion is unlikely to explain the onset of autumn leaf senescence in aspen.

2016-12-11 | GSE86960 | GEO

Trans-Zeatin-N-Glucosides have biological activity in Arabidopsis thaliana

Project description:Cytokinin is an indispensable phytohormone responsible for a number of physiological processes ranging from root development to leaf senescence. The term “cytokinin” refers to several dozen adenine-derived compounds which occur naturally in plants, including the model plant Arabidopsis thaliana. Cytokinins (CKs) can be divided up into various classes and forms; the base forms are generally considered to be active while highly abundant cytokinin-N-glucosides (CKNGs), which are composed of a CK base irreversibly conjugated to a glucose molecule, are considered inactive. However, results from early CK studies suggest CKNGs do not always lack activity despite the perpetuation in the literature that they are inactive. Here we show that exogenous application of CKNGs to Arabidopsis tissue results in a CK response comparable to the application of an active CK base. These results are most apparent in senescence assays in which both a CK base (tZ) and CKNGs (tZ7G, tZ9G) delay senescence in cotyledons. Further physiological experiments involving root growth and shoot regeneration revealed CKNGs do not always have the same effects as CK bases, and these compounds have largely distinct effects on the transcriptome, as well as the proteome. These data are in direct contradiction to previous reports of CKNGs being inactive and raise questions about the function of these compounds as well as their mechanism of action. Because CKNGs make up the majority of CKs in Arabidopsis and other Angiosperms, it is especially important to understand their physiological effects in order to have a more holistic understanding of this essential phytohormone.

2020-05-27 | PXD016087 | Pride

Arabidopsis thaliana

Project description:Expression data from Arabidopsis thaliana senescent leaves treated with cytokinins

| PRJNA305585 | ENA

Overexpression of OsMADS29 in Oryza sativa var. PB1

Project description:Overexpression of MADS29 results in severely dwarfed phenotype, resulting from a shift in auxin-cytokinin ratio in favor of cytokinins. To see the extent of change in gene expression in the leaves of the transgenic plants, whole genome transcript analysis was carried out using microarray.

2013-09-05 | GSE42028 | GEO

Hybrid aspen (Populus tremula x tremuloides)1h cytokinin induction and 1h control treatment data.

Project description:Aim of the project: Genome wide gene expression analysis for cytokinin (100nM 2ip, 20nM NaPi buffer) fast (1h) response genes from 3 months old Hybrid aspen(Populus tremula x tremuloides)apical part (30 cm from tip; diameter:4-5mm) of stem. Stems of two individuals (trees 15 and 16) was cut into 50-100um thick (free hand)cross sections randomly selected stem discs are set to two pools: cytokinin treatment and control treatment. Samples are collected noon time (11:00-11:30). Cytokinin treatment: stem discs (several hundred) are submerged with 100nM 2ip, 20nM NaPi buffer, with modest shaking for 60 min +/- 2 min (time to collect about 30mg stem discs (several dozens) for RNA sample. Control treatment: identical to cytokinin treatment, only without 100nM 2ip.

2016-07-14 | E-MTAB-4635 | biostudies-arrayexpress

Cytokinin responsive genes in rice

Project description:Cytokinins (CKs) are a class of plant hormones that regulate many aspects of growth and development, including cell division, apical dominance, leaf senescence, nutrient signaling, and shoot differentiation. In the past decade, substantial progress has been made in understanding CK biosynthesis, metabolism and signal transduction. Much of this knowledge is based on research in Arabidopsis, a dicotyledonous model plant. Although cytokinin plays an important role for growth and development in the Gramineae, our knowledge of cytokinin responsive genes in monocotyledonous species is very limited compared to Arabidopsis. The search for genes whose expression is modified by CK has yielded a number of valuable tools that have been used to understand CK signaling and the complex developmental processes under control of this hormone. We tried to identify rice genes regulated by CK using an Affymetrix rice genome array. Keywords: time_course; hormone_response; organ_specific_response

2007-02-15 | GSE6719 | GEO

The role of cytokinins in clubroot disease

Project description:Clubroot (Plasmodiophora brassicae) is a pathogen of Brassicaceae that causes significant reductions in yield as a consequence of gall formation in the root and hypocotyl of infected plants. The pathogen hijacks host vascular cambium development and cytokinins are implicated in this process. Microarray analysis was used to investigate changes in cytokinin metabolism during gall formation of clubroot-infected ipt1;3;5;7 mutants Arabidopsis thaliana. These mutants have severely restricted synthesis of host cytokinins (isopentenyl adenine and trans zeatin) and fail to form a vascular cambium and, as a consequence, do not undergo secondary thickening. Infection of these mutants allows the impact of pathogen-derived cytokinin synthesis to be observed.

2016-01-12 | E-MTAB-4201 | biostudies-arrayexpress

Expression data from Rice leaves

Project description:Senescence is a developmental process and chlorophyll is an indicator of leaf senescene. In plants cytokinin plays a role in delaying leaf senescence. Chlorophyll degradation is tightly regulated during senescence and cytokinin might interplay in the chrorophyll degradation pathway to regulate leaf greening. we used microarray to study the differential gene expression during leaf senescence and inpresence of a synthetic cytokinin (6-benzyl adenine). third leaf of 30-day-old rice plant were selected and incubated for 72 hours in solution containing 6-BA in darkness. Control condition leaves were incubated in solution without 6-BA. Three sets of control versus 6-BA treated leaves were used for RNA extraction and hybridation on Affymatrix rice gene chip.

2014-09-15 | E-GEOD-55902 | biostudies-arrayexpress

Epigenomic and transcriptomic dynamics of Arabidopsis senescent leaves

Project description:Senescence occurs in a programmed manner to dismantle the vegetative tissues and redirect the nutrients towards metabolic pathways supporting reproductive success. External factors can trigger the senescence program as an adaptive strategy, indicating that this terminal program is controlled at different levels. Using bisulphite conversion followed by sequencing, we interrogated changes in the methylome of senescent Arabidopsis leaves induced by darkness, and their impact on gene and transposable element (TE) expression with transcriptome sequencing. Two biological replicates were sequenced for each condition: S as senescent and NS as non senescent.

2019-12-30 | GSE132038 | GEO

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