Disruption of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase (DXR) gene results in albino, dwarf and defects in trichome initiation and stomata closure in Arabidopsis

Xing, Shufan; Miao, Junwei; Li, Shuang; Qin, Genji; Tang, Si; Li, Haoni; Gu, Hongya; Liu, Qu

doi:10.1038/cr.2010.54

Cited by 75 publications

(49 citation statements)

References 73 publications

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“…OeDXS OeDXR and OeHMBPPR had the strongest differential expression in accordance with their key role in the MEP pathway, which has been proposed in other plant species [40-42]. In particular, our results showed that OeDXS, which is involved in the first step of the MEP pathway, was exclusively expressed in the first developmental stage (45 DAF) in both cultivars.…”

Section: Resultssupporting

confidence: 86%

Olive phenolic compounds: metabolic and transcriptional profiling during fruit development

Alagna¹,

Mariotti²,

Panara³

et al. 2012

BMC Plant Biol

142

130

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BackgroundOlive (Olea europaea L.) fruits contain numerous secondary metabolites, primarily phenolics, terpenes and sterols, some of which are particularly interesting for their nutraceutical properties. This study will attempt to provide further insight into the profile of olive phenolic compounds during fruit development and to identify the major genetic determinants of phenolic metabolism.ResultsThe concentration of the major phenolic compounds, such as oleuropein, demethyloleuropein, 3–4 DHPEA-EDA, ligstroside, tyrosol, hydroxytyrosol, verbascoside and lignans, were measured in the developing fruits of 12 olive cultivars. The content of these compounds varied significantly among the cultivars and decreased during fruit development and maturation, with some compounds showing specificity for certain cultivars. Thirty-five olive transcripts homologous to genes involved in the pathways of the main secondary metabolites were identified from the massive sequencing data of the olive fruit transcriptome or from cDNA-AFLP analysis. Their mRNA levels were determined using RT-qPCR analysis on fruits of high- and low-phenolic varieties (Coratina and Dolce d’Andria, respectively) during three different fruit developmental stages. A strong correlation was observed between phenolic compound concentrations and transcripts putatively involved in their biosynthesis, suggesting a transcriptional regulation of the corresponding pathways. OeDXS, OeGES, OeGE10H and OeADH, encoding putative 1-deoxy-D-xylulose-5-P synthase, geraniol synthase, geraniol 10-hydroxylase and arogenate dehydrogenase, respectively, were almost exclusively present at 45 days after flowering (DAF), suggesting that these compounds might play a key role in regulating secoiridoid accumulation during fruit development.ConclusionsMetabolic and transcriptional profiling led to the identification of some major players putatively involved in biosynthesis of secondary compounds in the olive tree. Our data represent the first step towards the functional characterisation of important genes for the determination of olive fruit quality.

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Section: Resultssupporting

confidence: 86%

Olive phenolic compounds: metabolic and transcriptional profiling during fruit development

Alagna¹,

Mariotti²,

Panara³

et al. 2012

BMC Plant Biol

142

130

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“…6 and Table 2). Our data indicate that CDS_CCI2 has an important role in secondary metabolism processes, which is in accordance with study on disruption of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase (DXR) gene results in albino, dwarf and defects in trichome initiation and stomata closure in Arabidopsis (Xing et al 2010).…”

Section: Discussionsupporting

confidence: 93%

Cloning and functional analysis of CDS_CCI2: a Tanacetum cinerariaefolium chrysanthemyl diphosphate synthase gene

Tang

Khalil

et al. 2012

Plant Growth Regul

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Although irregular monoterpenes are important and common in the Asteraceae family, little is known about their biosynthesis at the genetic level via the MEP pathway. Chrysanthemyl diphosphate (CPP) is an intermediate in the biosynthesis of pyrethrins which are irregular monoterpenes with excellent insecticidal activity in Tanacetum cinerariaefolium (T. cinerariaefolium). In this study, a chrysanthemyl diphosphate synthase (CDS) gene named CDS_CCI2 (GenBank accession no. HQ235057) was isolated from T. cinerariaefolium. It was homologous to T. cinerariaefolium CPP gene family, and proved to be located in the plastid by the in situ subcellular localization. CDS_CCI2 was found to be expressed in roots, stems, leaves, buds and flowers. Moreover, the expression of CDS_CCI2 can be up-regulated by abscisic acid (ABA), methyl jasmonate and ethrel treatment. Phenotypic and molecular analysis showed that overexpression of CDS_CCI2 in micro-tom tomato resulted in dwarf phenotypes characterized with infertile flowers and seedless fruits. Furthermore, overexpression of CDS_CCI2 altered the production of endogenous secondary metabolites. Our data indicate that CPP affects the synthesis of gibberellic acid (GA) and ABA.

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“…Chl and carotenoids were extracted from the aboveground parts of 40-day-old Arabidopsis, as described previously [33]. Absorbance ( A ) of the final solution at 663, 647 and 470 nm was measured and the concentrations of Chl a (Ca), Chl b (Cb) and carotenoids (Cc) were calculated as follows [34]: …”

Section: Methodsmentioning

confidence: 99%

Disruption of the Homogentisate Solanesyltransferase Gene Results in Albino and Dwarf Phenotypes and Root, Trichome and Stomata Defects in Arabidopsis thaliana

et al. 2014

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Homogentisate solanesyltransferase (HST) plays an important role in plastoquinone (PQ) biosynthesis and acts as the electron acceptor in the carotenoids and abscisic acid (ABA) biosynthesis pathways. We isolated and identified a T-DNA insertion mutant of the HST gene that displayed the albino and dwarf phenotypes. PCR analyses and functional complementation also confirmed that the mutant phenotypes were caused by disruption of the HST gene. The mutants also had some developmental defects, including trichome development and stomata closure defects. Chloroplast development was also arrested and chlorophyll (Chl) was almost absent. Developmental defects in the chloroplasts were consistent with the SDS-PAGE result and the RNAi transgenic phenotype. Exogenous gibberellin (GA) could partially rescue the dwarf phenotype and the root development defects and exogenous ABA could rescue the stomata closure defects. Further analysis showed that ABA and GA levels were both very low in the pds2-1 mutants, which suggested that biosynthesis inhibition by GAs and ABA contributed to the pds2-1 mutants' phenotypes. An early flowering phenotype was found in pds2-1 mutants, which showed that disruption of the HST gene promoted flowering by partially regulating plant hormones. RNA-sequencing showed that disruption of the HST gene resulted in expression changes to many of the genes involved in flowering time regulation and in the biosynthesis of PQ, Chl, GAs, ABA and carotenoids. These results suggest that HST is essential for chloroplast development, hormone biosynthesis, pigment accumulation and plant development.

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Disruption of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase (DXR) gene results in albino, dwarf and defects in trichome initiation and stomata closure in Arabidopsis

Cited by 75 publications

References 73 publications

Olive phenolic compounds: metabolic and transcriptional profiling during fruit development

Olive phenolic compounds: metabolic and transcriptional profiling during fruit development

Cloning and functional analysis of CDS_CCI2: a Tanacetum cinerariaefolium chrysanthemyl diphosphate synthase gene

Disruption of the Homogentisate Solanesyltransferase Gene Results in Albino and Dwarf Phenotypes and Root, Trichome and Stomata Defects in Arabidopsis thaliana

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