scholarly journals Gene expression changes occurring at bolting time are associated with leaf senescence in Arabidopsis

Plant Direct ◽  
2020 ◽  
Vol 4 (11) ◽  
Author(s):  
Will E. Hinckley ◽  
Judy A. Brusslan
Keyword(s):  
Gene Expression ◽  
Leaf Senescence ◽  
Bolting Time

scholarly journals Gene Expression Changes Occurring at Bolting Time are Associated with Leaf Senescence in Arabidopsis

2020 ◽  
Author(s):  
Will E Hinckley ◽  
Judy A. Brusslan
Keyword(s):  
Gene Expression ◽  
Phase Transition ◽  
Time Series ◽  
Leaf Senescence ◽  
Molecular Mechanisms ◽  
Rna Seq ◽  
Age Dependent ◽  
Temporal Coupling ◽  
Rosette Leaf ◽  
Bolting Time

AbstractIn plants, the vegetative to reproductive phase transition (termed bolting in Arabidopsis) generally precedes age-dependent leaf senescence (LS). Many studies describe a temporal link between bolting time and LS, as plants that bolt early, senesce early, and plants that bolt late, senesce late. However, the molecular mechanisms underlying this relationship are unknown and are potentially agriculturally important, as they may allow for the development of crops that can overcome early LS caused by stress-related early phase transition. We hypothesized that gene expression changes associated with bolting time were regulating LS. We used a mutant that displays both early bolting and early LS as a model to test this hypothesis. An RNA-seq time series experiment was completed to compare the early bolting mutant to vegetative WT plants of the same age. This allowed us to identify bolting time-associated genes (BAGs) expressed in an older rosette leaf at the time of inflorescence emergence. The BAG list contains many well characterized LS regulators (ORE1, WRKY45, NAP, WRKY28), and GO analysis revealed enrichment for LS and LS-related processes. These bolting associated LS regulators likely contribute to the temporal coupling of bolting time to LS.

scholarly journals Genome-wide H3K9 Acetylation Level Increases with Age-Dependent Senescence of Flag Leaf in Rice (Oryza sativa)

2021 ◽  
Author(s):  
Yu Zhang ◽  
Yanyun Li ◽  
Yuanyuan Zhang ◽  
Zeyu Zhang ◽  
Deyu Zhang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Oryza Sativa ◽  
Leaf Senescence ◽  
Epigenetic Modification ◽  
Flag Leaf ◽  
Regulation Of Gene Expression ◽  
Leaf Aging ◽  
Genome Wide ◽  
Age Dependent ◽  
H3k9 Acetylation

Flag leaf senescence is an important biological process that drives the remobilization of nutrients to the growing organs of rice. Leaf senescence is controlled by genetic information via gene expression and epigenetic modification, but the precise mechanism is as of yet unclear. Here, we analyzed genome-wide acetylated lysine residue 9 of histone H3 (H3K9ac) enrichment by chromatin immunoprecipitation-sequencing (ChIP-seq) and examined its association with transcriptomes by RNA-seq during flag leaf aging in rice (Oryza sativa). We found that genome-wide H3K9 acetylation levels increased with age-dependent senescence in rice flag leaf, and there was a positive correlation between the density and breadth of H3K9ac and gene expression and transcript elongation. A set of 1,249 up-regulated, differentially expressed genes (DEGs) and 996 down-regulated DEGs showing a strong relationship between temporal changes in gene expression and gain/loss of H3K9ac was observed during rice flag leaf aging. We produced a landscape of H3K9 acetylation- modified gene expression targets that includes known senescence-associated genes, metabolism-related genes, as well as miRNA biosynthesis- related genes. Our findings reveal a complex regulatory network of metabolism- and senescence-related pathways mediated by H3K9ac and also elucidate patterns of H3K9ac-mediated regulation of gene expression during flag leaf aging in rice.

Differences in gene expression between natural and artificially induced leaf senescence in barley

2015 ◽  
Vol 176 ◽  
pp. 180-191 ◽  
Author(s):  
Armin Springer ◽  
Georg Acker ◽  
Sandra Bartsch ◽  
Heike Bauerschmitt ◽  
Steffen Reinbothe ◽  
...  
Keyword(s):  
Gene Expression ◽  
Leaf Senescence

scholarly journals Molecular Characterization of a Senescence-Associated Gene Encoding Cysteine Proteinase and its Gene Expression during Leaf Senescence in Sweet Potato

2002 ◽  
Vol 43 (9) ◽  
pp. 984-991 ◽  
Author(s):  
Guan-Hong Chen ◽  
Lin-Tzu Huang ◽  
Mee-Ngan Yap ◽  
Ruey-Hua Lee ◽  
Yih-Jong Huang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Molecular Characterization ◽  
Sweet Potato ◽  
Leaf Senescence ◽  
Cysteine Proteinase ◽  
Gene Encoding ◽  
Its Gene

scholarly journals A Genome-Wide Chronological Study of Gene Expression and Two Histone Modifications, H3K4me3 and H3K9ac, during Developmental Leaf Senescence

2015 ◽  
Vol 168 (4) ◽  
pp. 1246-1261 ◽  
Author(s):  
Judy A. Brusslan ◽  
Giancarlo Bonora ◽  
Ana M. Rus-Canterbury ◽  
Fayha Tariq ◽  
Artur Jaroszewicz ◽  
...  
Keyword(s):  
Gene Expression ◽  
Histone Modifications ◽  
Leaf Senescence ◽  
Genome Wide ◽  
A Genome

scholarly journals Developmentally controlled changes during Arabidopsis leaf development indicate causes for loss of stress tolerance with age

2020 ◽  
Vol 71 (20) ◽  
pp. 6340-6354
Author(s):  
Aakansha Kanojia ◽  
Saurabh Gupta ◽  
Maria Benina ◽  
Alisdair R Fernie ◽  
Bernd Mueller-Roeber ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Gene Expression ◽  
Stress Tolerance ◽  
Leaf Senescence ◽  
Leaf Development ◽  
Cellular Events ◽  
Age Related ◽  
Elevated Expression ◽  
Stress Related Genes ◽  
Developmental Programme

Abstract Leaf senescence is the final stage of leaf development and is induced by the gradual occurrence of age-related changes (ARCs). The process of leaf senescence has been well described, but the cellular events leading to this process are still poorly understood. By analysis of progressively ageing, but not yet senescing, Arabidopsis thaliana rosette leaves, we aimed to better understand processes occurring prior to the onset of senescence. Using gene expression analysis, we found that as leaves mature, genes responding to oxidative stress and genes involved in stress hormone biosynthesis and signalling were up-regulated. A decrease in primary metabolites that provide protection against oxidative stress was a possible explanation for the increased stress signature. The gene expression and metabolomics changes occurred concomitantly to a decrease in drought, salinity, and dark stress tolerance of individual leaves. Importantly, stress-related genes showed elevated expression in the early ageing mutant old5 and decreased expression in the delayed ageing mutant ore9. We propose that the decreased stress tolerance with age results from the occurrence of senescence-inducing ARCs that is integrated into the leaf developmental programme, and that this ensures a timely and certain death.

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