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PMID:20200070

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Citation

Zheng, Z, Xu, X, Crosley, RA, Greenwalt, SA, Sun, Y, Blakeslee, B, Wang, L, Ni, W, Sopko, MS, Yao, C, Yau, K, Burton, S, Zhuang, M, McCaskill, DG, Gachotte, D, Thompson, M and Greene, TW (2010) The protein kinase SnRK2.6 mediates the regulation of sucrose metabolism and plant growth in Arabidopsis. Plant Physiol. 153:99-113

Abstract

In higher plants, three subfamilies of sucrose nonfermenting-1 (Snf1)-related protein kinases have evolved. While the Snf1-related protein kinase 1 (SnRK1) subfamily has been shown to share pivotal roles with the orthologous yeast Snf1 and mammalian AMP-activated protein kinase in modulating energy and metabolic homeostasis, the functional significance of the two plant-specific subfamilies SnRK2 and SnRK3 in these critical processes is poorly understood. We show here that SnRK2.6, previously identified as crucial in the control of stomatal aperture by abscisic acid (ABA), has a broad expression pattern and participates in the regulation of plant primary metabolism. Inactivation of this gene reduced oil synthesis in Arabidopsis (Arabidopsis thaliana) seeds, whereas its overexpression increased Suc synthesis and fatty acid desaturation in the leaves. Notably, the metabolic alterations in the SnRK2.6 overexpressors were accompanied by amelioration of those physiological processes that require high levels of carbon and energy input, such as plant growth and seed production. However, the mechanisms underlying these functionalities could not be solely attributed to the role of SnRK2.6 as a positive regulator of ABA signaling, although we demonstrate that this kinase confers ABA hypersensitivity during seedling growth. Collectively, our results suggest that SnRK2.6 mediates hormonal and metabolic regulation of plant growth and development and that, besides the SnRK1 kinases, SnRK2.6 is also implicated in the regulation of metabolic homeostasis in plants.

Links

PubMed PMC2862418 Online version:10.1104/pp.109.150789

Keywords

Abscisic Acid/metabolism; Arabidopsis/enzymology; Arabidopsis/genetics; Arabidopsis/growth & development; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Energy Metabolism; Fatty Acid Desaturases/metabolism; Gene Expression; Gene Expression Regulation, Plant; Germination; Mosaic Viruses; Plant Leaves/metabolism; Plant Oils/metabolism; Plants, Genetically Modified/enzymology; Plants, Genetically Modified/genetics; Plants, Genetically Modified/growth & development; Promoter Regions, Genetic; Protein-Serine-Threonine Kinases/genetics; Protein-Serine-Threonine Kinases/metabolism; Seedling/growth & development; Seeds/growth & development; Seeds/metabolism; Sucrose/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:SRK2E

acts_upstream_of_or_within

GO:0019432: triglyceride biosynthetic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

acts_upstream_of_or_within

GO:0006636: unsaturated fatty acid biosynthetic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

acts_upstream_of_or_within

GO:0005985: sucrose metabolic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

acts_upstream_of_or_within

GO:0009737: response to abscisic acid

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

acts_upstream_of_or_within

GO:0048366: leaf development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

involved_in

GO:0006636: unsaturated fatty acid biosynthetic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

involved_in

GO:0005985: sucrose metabolic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

involved_in

GO:0009737: response to abscisic acid

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

involved_in

GO:0019432: triglyceride biosynthetic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:SRK2E

involved_in

GO:0048366: leaf development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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