The promoter activity of sen 1, a senescence-associated gene of Arabidopsis, is repressed by sugars

Chung, Byoung-Chull; Lee, Sang Yeb; Oh, Sung Aeong; Rhew, Tae Hyong; Nam, Hong Gil; Lee, Choon-Hwan

doi:10.1016/s0176-1617(97)80262-3

Cited by 35 publications

(25 citation statements)

References 22 publications

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“…However, some contradictory data indicate that senescence in petals can be induced by sugar starvation as external application of sugar can delay senescence (van Doorn, 2004), and the reduction of photosynthetic efficiency, resulting in sugar starvation in the leaf, has been supposed to be a signal for induction of senescence (Hensel et al, 1993). This is in addition supported by the observation that the dark-induced expression of many senescence-enhanced genes is repressed in the presence of Suc (Chung et al, 1997). Obviously, the relationship between sugar levels and senescence is therefore not yet clear and might depend on the combination with other developmental signals (Ono et al, 2001).…”

Section: Senescencementioning

confidence: 99%

Natural Variation for Carbohydrate Content in Arabidopsis. Interaction with Complex Traits Dissected by Quantitative Genetics

et al. 2006

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Besides being a metabolic fuel, carbohydrates play important roles in plant growth and development, in stress responses, and as signal molecules. We exploited natural variation in Arabidopsis (Arabidopsis thaliana) to decipher the genetic architecture determining carbohydrate content. A quantitative trait locus (QTL) approach in the Bay-0 3 Shahdara progeny grown in two contrasting nitrogen environments led to the identification of 39 QTLs for starch, glucose, fructose, and sucrose contents representing at least 14 distinct polymorphic loci. A major QTL for fructose content (FR3.4) and a QTL for starch content (ST3.4) were confirmed in heterogeneous inbred families. Several genes associated with carbon (C) metabolism colocalize with the identified QTL. QTLs for senescence-related traits, and for flowering time, water status, and nitrogen-related traits, previously detected with the same genetic material, colocalize with C-related QTLs. These colocalizations reflect the complex interactions of C metabolism with other physiological processes. QTL fine-mapping and cloning could thus lead soon to the identification of genes potentially involved in the control of different connected physiological processes.Sugars and starch are important plant products used for human diet and as raw material in industry (Roeper, 2002). The level and quality of carbohydrates depends on the species, the organ, growth conditions, and many other parameters, but globally reflects the balance between photosynthesis and growth. In addition, total plant biomass and, therefore, yield in the case of many crops largely depend on photosynthetic carbon (C) fixation and carbohydrate metabolism.During photosynthesis, CO 2 is fixed in the chloroplast into triose-phosphates, which are mainly used to regenerate ribulose-1,5-bisphosphate. Only the surplus is exported in the cytosol in counter exchange with inorganic orthophosphate (Edwards and Walker, 1983). In the cytosol triose-phosphates are converted to end products, including Suc, by releasing phosphate. Suc is the main transport form of C, which is translocated via the phloem to the sink organs. Suc phosphate synthase and Suc synthase (Susy) catalyze the formation of Suc in the cytosol, either with the substrates Fru-6-P and UDP-Glc or from Fru and UDPGlc, respectively. Susy, a reversible enzyme, is more important for Suc degradation than for Suc synthesis. The catalytic reaction of Suc phosphate synthase results in Suc-6-P, and Suc synthesis is completed by the action of Suc-6-P phosphatase.In the chloroplast, some of the photosynthate is directly converted to starch, which represents a transient storage, and is remobilized during the night to maintain leaf metabolism and Suc export to sink organs (Geiger and Servaites, 1994). ADP-Glc pyrophosphorylase catalyzes the first committed step of starch synthesis, producing ADP-Glc, the substrate for soluble and granule-bound starch synthases. The first product, amylose, is then further processed by starch branching enzymes I and II (Dennis and Blakele...

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Section: Senescencementioning

confidence: 99%

Natural Variation for Carbohydrate Content in Arabidopsis. Interaction with Complex Traits Dissected by Quantitative Genetics

et al. 2006

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“…Their sugar content declines as a result of limited photosynthesis, so their senescence may be induced by sugar starvation. Chung et al (1997) discovered in Arabidopsis plants a gene called sen 1, which was expressed during leaf senescence. A particularly strong expression of the gene was observed in excised leaves kept in darkness, which simultaneously showed symptoms of accelerated senescence.…”

Section: Sugar Starvation Versus Senescencementioning

confidence: 99%

Plant Responses to Sugar Starvation

Morkunas¹,

Borek²,

Formela³

et al. 2012

Carbohydrates - Comprehensive Studies on Glycobiology and Glycotechnology

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“…Among downregulated genes are components of the photosynthetic machinery and the sucrose-sensitive transcripts sen1 and asn1 (Lam et al, 1994;Chung et al, 1997). Photosynthetic capacity is known to be inhibited by the presence of excess free sugars (Oswald et al, 2001), and sen1 and asn1 are downregulated by sugar accumulation (Lam et al, 1994;Chung et al, 1997).…”

Section: The Plant Lammer Kinase Modulates Development and Gene Exprementioning

confidence: 99%

“…Photosynthetic capacity is known to be inhibited by the presence of excess free sugars (Oswald et al, 2001), and sen1 and asn1 are downregulated by sugar accumulation (Lam et al, 1994;Chung et al, 1997). Thus, a situation could be imagined in which these seemingly disparate transcripts are reduced as a result of increased sugar levels acting as a unifying signal.…”

Section: The Plant Lammer Kinase Modulates Development and Gene Exprementioning

confidence: 99%

Alternative Splicing Modulation by a LAMMER Kinase Impinges on Developmental and Transcriptome Expression

et al. 2003

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Alternative splicing is a major contributor to genome complexity, playing a significant role in various cellular functions, including signal transduction, immunity, and development. The spliceosomal machinery is responsible for the processing of nuclear RNA. Several splicing factors associated with this complex are phosphorylated by kinases that possess a conserved LAMMER motif. We demonstrate in BY-2 tobacco cells a novel role for the LAMMER motif in the maintenance of proper subnuclear localization. Furthermore, high expression of the LAMMER kinase in Arabidopsis plants modulated the alternative splicing of specific endogenous genes and resulted in abnormal plant development and a novel transcriptome profile. A prominent feature was the upregulation of genes that play a role in protein turnover, suggesting a moderating function for these gene products in the control of alternative splicing events. Together, these results demonstrate alternative splicing modulation as a result of phosphorylation activity, providing an opportunity to study its global effect on the plasticity of plant development and gene expression at the organism level.

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The promoter activity of sen 1, a senescence-associated gene of Arabidopsis, is repressed by sugars

Cited by 35 publications

References 22 publications

Natural Variation for Carbohydrate Content in Arabidopsis. Interaction with Complex Traits Dissected by Quantitative Genetics

Natural Variation for Carbohydrate Content in Arabidopsis. Interaction with Complex Traits Dissected by Quantitative Genetics

Plant Responses to Sugar Starvation

Alternative Splicing Modulation by a LAMMER Kinase Impinges on Developmental and Transcriptome Expression

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