RRC ID 21121
著者 Nakagawa N, Kato M, Takahashi Y, Shimazaki K, Tamura K, Tokuji Y, Kihara A, Imai H.
タイトル Degradation of long-chain base 1-phosphate (LCBP) in Arabidopsis: functional characterization of LCBP phosphatase involved in the dehydration stress response.
ジャーナル J Plant Res
Abstract Sphingolipid metabolites, long-chain base 1-phosphates (LCBPs), are involved in ABA signaling pathways. The LCBPs synthesized by long-chain base kinase are dephosphorylated by LCBP phosphatase or degraded by LCBP lyase. Here we show that the At3g58490 gene encodes AtSPP1, a functional LCBP phosphatase. Transient expression of green fluorescent protein fusion in suspension-cultured Arabidopsis cells showed that AtSPP1 is localized in the endoplasmic reticulum. The level of dihydrosphingosine 1-phosphate was increased in loss-of-function mutants (spp1) compared with wild-type (WT) plants, suggesting a role of AtSPP1 in regulating LCBP levels. The rate of decrease in fresh weight of detached aerial parts was significantly slower in spp1 mutants than in WT plants. A stomatal closure bioassay showed that the stomata of spp1 mutants were more sensitive than the WT to ABA, suggesting that AtSPP1 is involved in guard cell signaling. However, spp1 mutants showed decreased sensitivity to ABA with respect to primary root growth but not to seed germination. The response to fumonisin B(1) did not differ between the WT and spp1 mutant. A significant decrease in AtDPL1 (LCBP lyase) transcripts in spp1 mutants was observed. We conclude that AtSPP1 is a functional LCBP phosphatase that may play a role in stomatal responses through LCBP-mediated ABA signaling.
巻・号 125(3)
ページ 439-49
公開日 2012-5-1
DOI 10.1007/s10265-011-0451-9
PMID 21910031
MeSH Abscisic Acid / metabolism Acclimatization / physiology* Arabidopsis / enzymology* Arabidopsis / genetics* Gene Expression Regulation, Enzymologic Gene Expression Regulation, Plant Genetic Variation Genotype Mutation Phosphates / metabolism* Phosphoric Monoester Hydrolases / metabolism* Plant Components, Aerial / metabolism Plant Stomata / metabolism Proteolysis Signal Transduction Sphingolipids / metabolism Stress, Physiological / physiology*
IF 2.185
引用数 20
WOS 分野 PLANT SCIENCES
リソース情報
シロイヌナズナ / 植物培養細胞・遺伝子 pda09352 pda09604 pda04689 pda04178 pda02078