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Roeckel, P.; Oancia, Tammy; Drevet, Joël R.

doi:10.1023/a:1018425720949

Cited by 21 publications

(4 citation statements)

References 16 publications

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“…The biological mechanism underlying these effects is unknown; however, the decreased number of grains as the reduced availability of sink organs for fixed carbon can be considered the main cause for the increased seed size. It is reported that cytokinin controls seed number and size [ 28 , 29 ], and that Methylobacterium species are able to synthesize trans-zeatin [ 8 , 14 ]. The effect of M .…”

Section: Resultsmentioning

confidence: 99%

Methylobacterium Species Promoting Rice and Barley Growth and Interaction Specificity Revealed with Whole-Cell Matrix-Assisted Laser Desorption / Ionization-Time-of-Flight Mass Spectrometry (MALDI-TOF/MS) Analysis

et al. 2015

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Methylobacterium species frequently inhabit plant surfaces and are able to utilize the methanol emitted from plants as carbon and energy sources. As some of the Methylobacterium species are known to promote plant growth, significant attention has been paid to the mechanism of growth promotion and the specificity of plant–microbe interactions. By screening our Methylobacterium isolate collection for the high growth promotion effect in vitro, we selected some candidates for field and pot growth tests for rice and barley, respectively. We found that inoculation resulted in better ripening of rice seeds, and increased the size of barley grains but not the total yield. In addition, using whole-cell matrix-assister laser desorption/ionization- time-of-flight mass spectrometry (MALDI-TOF/MS) analysis, we identified and classified Methylobacterium isolates from Methylobacterium-inoculated rice plants. The inoculated species could not be recovered from the rice plants, and in some cases, the Methylobacterium community structure was affected by the inoculation, but not with predomination of the inoculated species. The isolates from non-inoculated barley of various cultivars grown in the same field fell into just two species. These results suggest that there is a strong selection pressure at the species level of Methylobacterium residing on a given plant species, and that selection of appropriate species that can persist on the plant is important to achieve growth promotion.

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Section: Resultsmentioning

confidence: 99%

Methylobacterium Species Promoting Rice and Barley Growth and Interaction Specificity Revealed with Whole-Cell Matrix-Assisted Laser Desorption / Ionization-Time-of-Flight Mass Spectrometry (MALDI-TOF/MS) Analysis

et al. 2015

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“…Two different approaches have been followed: 1) increasing cytokinin biosynthesis by the ectopic expression of ISOPENTENYL TRANSFERASE ( IPT ) genes that catalyze the rate-limiting step in cytokinin synthesis or 2) reducing cytokinin degradation through down-regulation of CYTOKININ OXIDASE/DEHYDROGENASE ( CKX ) genes. For the first case, several promoters have been used, however, although some positive effects have been achieved, such transgenic plants also had both morphological and physiological negative effects 14 – 18 . Recently, it has been reported that transgenic canola ( B. napus ) plants expressing the IPT gene under the control of a modified version of the AtMYB3 2 promoter showed increased yield 29 .…”

Section: Discussionmentioning

confidence: 99%

“…A good strategy to get more seeds per fruit would be to use a specific regulatory region to up-regulate IPT genes or to down-regulate CKX genes exclusively in the placental tissue of the gynoecium, in order to stimulate the meristematic activity of this tissue 21 , 25 , 31 . Moreover, this strategy could be combined with genetics or the use of specific regulatory regions that provide expression in the inflorescence meristem to increase the cytokinin concentration, resulting in the production of more fruits per plant 18 , 21 , 29 .…”

Section: Discussionmentioning

confidence: 99%

“…The first approach was to increase endogenous cytokinin levels by ectopic expression of ISOPENTENYL TRANSFERASE ( IPT ) genes that catalyze the rate-limiting step in cytokinin biosynthesis. For this, several promoters have been used, however, although some positive effects have been achieved, such transgenic plants also had both morphological and physiological negative effects 14 – 18 . The other approach followed was to reduce cytokinin degradation through down-regulation of CYTOKININ OXIDASE/DEHYDROGENASE ( CKX ) genes.…”

Section: Introductionmentioning

confidence: 99%

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Conserved and novel responses to cytokinin treatments during flower and fruit development in Brassica napus and Arabidopsis thaliana

Zúñiga-Mayo

Baños-Bayardo

Díaz-Ramírez

et al. 2018

Sci Rep

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Hormones are an important component in the regulatory networks guiding plant development. Cytokinins are involved in different physiological and developmental processes in plants. In the model plant Arabidopsis thaliana, cytokinin application during gynoecium development produces conspicuous phenotypes. On the other hand, Brassica napus, also known as canola, is a crop plant belonging to the Brassicaceae family, as A. thaliana. This makes B. napus a good candidate to study whether the cytokinin responses observed in A. thaliana are conserved in the same plant family. Here, we observed that cytokinin treatment in B. napus affects different traits of flower and fruit development. It increases ovule and seed number, affects stamen filament elongation and anther maturation, and causes a conspicuous overgrowth of tissue in petals and gynoecia. Furthermore, cytokinin recovers replum development in both wild type B. napus and in the A. thaliana rpl ntt double mutant, in which no replum is visible. These results indicate both conserved and novel responses to cytokinin in B. napus. Moreover, in this species, some cytokinin-induced phenotypes are inherited to the next, untreated generation, suggesting that cytokinins may trigger epigenetic modifications.

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The Biotechnological Potential of Cytokinin Status Manipulation

Šmehilová

Spíchal

2013

Plant Cell Monographs

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Cytokinins are highly conserved plant hormones with a long evolutionary history that regulate various aspects of plant growth and development. The genetic background of the mechanisms involved in the regulation of plants' cytokinin status has recently been elucidated. Studies on transgenic plants with altered cytokinin biosynthesis, metabolism, degradation, or signaling revealed interesting consequences of cytokinin deficiency or disruption of cytokinin perception that can be applied in plant biotechnology and agriculture. Cytokinin levels and the sensing thereof can be manipulated using transgenic approaches and by treating plants with novel exogenous compounds in order to promote root system development, biomass formation, yield-forming traits, nutrient uptake, and tolerance of biotic and abiotic stresses. This chapter provides an overview of recent findings concerning the molecular basis and genetic background of cytokinin signaling and metabolism and the ways in which they can be manipulated to tailor plants' traits to meet specific requirements.

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Cited by 21 publications

References 16 publications

Methylobacterium Species Promoting Rice and Barley Growth and Interaction Specificity Revealed with Whole-Cell Matrix-Assisted Laser Desorption / Ionization-Time-of-Flight Mass Spectrometry (MALDI-TOF/MS) Analysis

Methylobacterium Species Promoting Rice and Barley Growth and Interaction Specificity Revealed with Whole-Cell Matrix-Assisted Laser Desorption / Ionization-Time-of-Flight Mass Spectrometry (MALDI-TOF/MS) Analysis

Conserved and novel responses to cytokinin treatments during flower and fruit development in Brassica napus and Arabidopsis thaliana

The Biotechnological Potential of Cytokinin Status Manipulation

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