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1.
J Plant Res ; 122(4): 415-9, 2009 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-19319626

RESUMO

The sphingoid long-chain base (LCB) composition of glucosylceramides was characterized in 31 species of Fabaceae including the model legumes Lotus japonicus and Medicago truncatula. With the exception of Lupinus texensis L, the 8-trans/cis-unsaturated isomers of 4-hydroxy-8-sphingenines [i.e., t18:1 (8t) plus t18:1 (8c)] were the major components in each species. In tribe Fabeae, each species from four genera--Pisum, Lathyrus, Lens, and Vicia--showed that more than 50% of dihydroxy sphingoid LCBs are 8-sphingenines [i.e., d18:1 (8t) plus d18:1 (8c)]. These results suggest that the sphingoid LCB composition of glucosylceramides reflects the phylogenetic relationships within the Fabeae.


Assuntos
Fabaceae/química , Glucosilceramidas/análise , Filogenia , Aldeídos/análise , Cromatografia Gasosa , Folhas de Planta/química
2.
Plant Cell Physiol ; 49(11): 1758-63, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18849574

RESUMO

Sphingoid long-chain base (LCB) 1-phosphates are degradated by LCB 1-phosphate lyase to C(16) fatty aldehydes and phosphoethanolamine. Here, we confirmed that the At1g27980 gene product, AtDPL1, is a functional LCB-1-phosphate lyase. Expression of green fluorescent protein fusion products in suspension-cultured Arabidopsis cells showed that AtDPL1 is located to the endoplasmic reticulum. The rates of fresh weight decreases of dpl1-1 and dpl1-2 mutants were significantly slower than those of the wild-type plants. This ability to limit their transpiration reflected the leaf temperature of the mutant plants more than that of wild-type plants, suggesting that AtDPL1 plays a role in dehydration stress.


Assuntos
Aldeído Liases/metabolismo , Proteínas de Arabidopsis/metabolismo , Arabidopsis/enzimologia , Desidratação/metabolismo , Fosfatos/metabolismo , Aldeído Liases/genética , Arabidopsis/genética , Proteínas de Arabidopsis/genética , DNA Bacteriano/genética , Retículo Endoplasmático/metabolismo , Deleção de Genes , Regulação da Expressão Gênica de Plantas , Genes de Plantas , Teste de Complementação Genética , Proteínas de Fluorescência Verde/genética , Proteínas de Fluorescência Verde/metabolismo , Mutagênese Insercional , Mutação , Transpiração Vegetal , RNA de Plantas/genética , Saccharomyces cerevisiae/enzimologia , Saccharomyces cerevisiae/genética , Estresse Fisiológico
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