OrangerV1, PascalFrancis, Checkpoint, bibRecord, 000296

Involvement of polyamine biosynthesis in somatic embryogenesis of Valencia sweet orange (Citrus sinensis) induced by glycerol

Identifieur interne : 000296 ( PascalFrancis/Checkpoint ); précédent : 000295; suivant : 000297

Involvement of polyamine biosynthesis in somatic embryogenesis of Valencia sweet orange (Citrus sinensis) induced by glycerol

Auteurs : Xiao-Ba Wu [République populaire de Chine] ; JING WANG [République populaire de Chine] ; Ji-Hong Liu [République populaire de Chine] ; Xiu-Xin Deng [République populaire de Chine]

Source :

Journal of plant physiology [ 0176-1617 ] ; 2009.

RBID : Pascal:09-0086904

Descripteurs français

Pascal (Inist)
- Polyamine, Biosynthèse, Développement embryonnaire, Embryon somatique, Culture tissu, Expression génique, Citrus sinensis, Glycérol, Ornithine(2-difluorométhyl), Ornithine(2-difluorométhyl), Physiologie végétale.

English descriptors

KwdEn :
- Biosynthesis, Citrus sinensis, Embryonic development, Gene expression, Glycerol, Plant physiology, Polyamine, Somatic embryo, Tissue culture.

Abstract

Culture of Citrus sinensis embryogenic callus on the embryo-inducing medium (EIM) containing glycerol gave rise to a large number of embryos, whereas very few embryos were observed on the callus growth medium (CGM). In the current paper, attempts were made to investigate whether polyamine biosynthesis was involved in glycerol-mediated somatic embryogenesis. Quantification of free polyamines by high-performance liquid chromatography showed that the cultures on EIM had less putrescine than those on CGM. However, increase in spermidine and spermine was detected in cultures on EIM during the first 20 d of culture, coincident with abundant somatic embryogenesis. The globular embryos contained more polyamines than embryos at other stages. Semi-quantitative reverse transcriptase-polymerase chain reaction assay showed that expression levels of all of the five key genes involved in polyamine biosynthesis, with the exception of S-adenosylmethionine decarboxylase, were induced in cultures on EIM, and that their transcriptional levels were increased with maturation of the embryos. Addition of α-difluoromethylornithine, a polyamine biosynthesis inhibitor, to EIM resulted in remarkable inhibition of somatic embryogenesis, concurrent with notable reduction of endogenous putrescine and spermidine, particularly at higher concentrations. Exogenous application of 1 mM putrescine to EIM together with 5mM α-difluoromethylornithine led to dramatic enhancement of endogenous polyamines, which successfully restored somatic embryogenesis. All of these, collectively, demonstrated that free polyamines, at least spermidine and spermine herein, were involved in glycerol-mediated promotion of somatic embryogenesis, which will open a new avenue for establishing a sophisticated system for somatic embryogenesis based on the modulation of endogenous polyamines.

Affiliations:

République populaire de Chine

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Culture of Citrus sinensis embryogenic callus on the embryo-inducing medium (EIM) containing glycerol gave rise to a large number of embryos, whereas very few embryos were observed on the callus growth medium (CGM). In the current paper, attempts were made to investigate whether polyamine biosynthesis was involved in glycerol-mediated somatic embryogenesis. Quantification of free polyamines by high-performance liquid chromatography showed that the cultures on EIM had less putrescine than those on CGM. However, increase in spermidine and spermine was detected in cultures on EIM during the first 20 d of culture, coincident with abundant somatic embryogenesis. The globular embryos contained more polyamines than embryos at other stages. Semi-quantitative reverse transcriptase-polymerase chain reaction assay showed that expression levels of all of the five key genes involved in polyamine biosynthesis, with the exception of S-adenosylmethionine decarboxylase, were induced in cultures on EIM, and that their transcriptional levels were increased with maturation of the embryos. Addition of α-difluoromethylornithine, a polyamine biosynthesis inhibitor, to EIM resulted in remarkable inhibition of somatic embryogenesis, concurrent with notable reduction of endogenous putrescine and spermidine, particularly at higher concentrations. Exogenous application of 1 mM putrescine to EIM together with 5mM α-difluoromethylornithine led to dramatic enhancement of endogenous polyamines, which successfully restored somatic embryogenesis. All of these, collectively, demonstrated that free polyamines, at least spermidine and spermine herein, were involved in glycerol-mediated promotion of somatic embryogenesis, which will open a new avenue for establishing a sophisticated system for somatic embryogenesis based on the modulation of endogenous polyamines.</div>
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Involvement of polyamine biosynthesis in somatic embryogenesis of Valencia sweet orange (Citrus sinensis) induced by glycerol

Involvement of polyamine biosynthesis in somatic embryogenesis of Valencia sweet orange (Citrus sinensis) induced by glycerol

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