SPL8, a local regulator in a subset of gibberellin-mediated developmental processes in Arabidopsis

Zhang, Yan; Schwarz, Štefan; Saedler, Heinz; Huijser, Peter

doi:10.1007/s11103-006-9099-6

Cited by 172 publications

(149 citation statements)

References 42 publications

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“…In addition to the role of the SPL7 transcription factor in Cu deficiency responses, other Arabidopsis SPL members have been shown to participate in flowering transition and fertility (Cardon et al, 1999;Unte et al, 2003;Wu and Poethig, 2006;Gandikota et al, 2007;Zhang et al, 2007;Wang et al, 2009;Wu et al, 2009). It is interesting that two members of the Physcomitrella patens SPL family, which are homologous to Arabidopsis SPL8, are regulated by the circadian clock (Riese et al, 2008).…”

Section: Copt1 and Copt3 Overexpression Effects Inmentioning

confidence: 99%

Deregulated Copper Transport Affects Arabidopsis Development Especially in the Absence of Environmental Cycles

et al. 2010

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Copper is an essential cofactor for key processes in plants, but it exerts harmful effects when in excess. Previous work has shown that the Arabidopsis (Arabidopsis thaliana) COPT1 high-affinity copper transport protein participates in copper uptake through plant root tips. Here, we show that COPT1 protein localizes to the plasma membrane of Arabidopsis cells and the phenotypic effects of transgenic plants overexpressing either COPT1 or COPT3, the latter being another high-affinity copper transport protein family member. Both transgenic lines exhibit increased endogenous copper levels and are sensitive to the copper in the growth medium. Additional phenotypes include decreased hypocotyl growth in red light and differentially affected flowering times depending on the photoperiod. Furthermore, in the absence of environmental cycles, such as light and temperature, the survival of plants overexpressing COPT1 or COPT3 is compromised. Consistent with altered circadian rhythms, the expression of the nuclear circadian clock genes CIRCADIAN CLOCK-ASSOCIATED1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY) is substantially reduced in either COPT1-or COPT3-overexpressing plants. Copper affects the amplitude and the phase, but not the period, of the CCA1 and LHY oscillations in wild-type plants. Copper also drives a reduction in the expression of circadian clock output genes. These results reveal that the spatiotemporal control of copper transport is a key aspect of metal homeostasis that is required for Arabidopsis fitness, especially in the absence of environmental cues.

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Section: Copt1 and Copt3 Overexpression Effects Inmentioning

confidence: 99%

Deregulated Copper Transport Affects Arabidopsis Development Especially in the Absence of Environmental Cycles

et al. 2010

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“…Anther dehiscence involves the processes of thickening of secondary cell walls, consecutive degeneration of various anther tissues, changes in carbohydrate metabolism, and movement of water out of the anther (Keijzer, 1987;Clément and Audran, 1995;Bots et al, 2005). GA deficiency or overdose produces nondehiscent anthers in various plant species (Colombo and Favret, 1996;Murray et al, 2003;Zhang et al, 2007), indicating that a fine-tuned GA signaling is important for anther dehiscence. RGAregulated genes include some genes involved in water or osmotic stress, such as aquaporin-like genes, dehydrins, and Pro oxidase genes.…”

Section: Rga Predominantly Regulates Stamen and Pollen Developmentmentioning

confidence: 99%

Global Identification of DELLA Target Genes during Arabidopsis Flower Development

Hou

Shen

et al. 2008

Plant Physiology

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Gibberellin (GA) plays important roles in regulating many aspects of plant development. GA derepresses its signaling pathway by promoting the degradation of DELLA proteins, a family of nuclear growth repressors. Although the floral organ identity is established in flowers of the GA-deficient mutant ga1-3, the growth of all floral organs is severely retarded. In particular, abortive anther development in ga1-3 results in male sterility. Genetic analysis has revealed that various combinations of null mutants of DELLA proteins could gradually rescue floral organ defects in ga1-3 and that RGA is the most important DELLA protein involved in floral organ development. To elucidate the early molecular events controlled by RGA during flower development, we performed whole-genome microarray analysis to identify genes in response to the steroid-inducible activation of RGA in ga1-3 rgl2 rga 35S:RGA-GR. Although DELLA proteins were suggested as transcriptional repressors, similar numbers of genes were down-regulated or up-regulated by RGA during floral organ development. More than one-third of RGA down-regulated genes were specifically or predominantly expressed in stamens. A significant number of RGA-regulated genes are involved in phytohormone signaling or stress response. Further expression analysis through activation of RGA by steroid induction combined with cycloheximide identified eight genes as immediate targets of RGA. In situ hybridization and transgenic studies further showed that the expression pattern and function of several selected genes were consistent with the predictions from microarray analysis. These results suggest that DELLA regulation of floral organ development is modulated by multiple phytohormones and stress signaling pathways.

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“…In maize, for instance, mutations of the SBP-box genes LG1 and TGA1 uncovered roles in leaf and glume development, respectively (Moreno et al, 1997;Wang et al, 2005). In A. thaliana, fertility is reduced upon SPL8 loss-of-function and a role for SPL8 as a local regulator of GAmediated signalling has been suggested (Unte et al, 2003;Zhang et al, 2007). Stone et al (2005) discovered that a reduction of SPL14 expression increased resistance to the fungal toxin fumonisin B1.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the SBP-box gene families in P. patens and seed plants

Riese¹,

Höhmann²,

Saedler³

et al. 2007

Gene

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104

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To come to a better understanding of the evolution and function of the SBP-box transcription factor family in plants, we identified, isolated and characterized 13 of its members from the moss Physcomitrella patens. For the majority of the moss SBP-box genes, clear orthologous relationships with family members of flowering plants could be established by phylogenetic analysis based on the conserved DNA-binding SBPdomain, as well as additional synapomorphic molecular characters. The P. patens SBP-box genes cluster in four separable groups. One of these consists exclusively of moss genes; the three others are shared with family members of Arabidopsis and rice. Besides the family defining DNAbinding SBP-domain, other features can be found conserved between moss and other plant SBP-domain proteins. An AHA-like motif conserved from the unicellular alga Chlamydomonas reinhardtii to flowering plants, was found able to promote transcription in a heterologous yeast system. The conservation of a functional microRNA response element in the mRNA of three of the moss SBP-box genes supports the idea of an ancient origin of microRNA dependent regulation of SBP-box gene family members.As our current knowledge concerning the roles of SBP-box genes in plant development is scarce and the model system P. patens allows targeted mutation, the material we isolated and characterized will be helpful to generate the mutant phenotypes necessary to further elucidate these roles.

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SPL8, a local regulator in a subset of gibberellin-mediated developmental processes in Arabidopsis

Abstract: Gibberellins (GAs) are important plant growth regulators, regulating many plant developmental processes, including seed germination, root and stem elongation, rosette expansion, floral induction and anther development.

Cited by 172 publications

References 42 publications

Deregulated Copper Transport Affects Arabidopsis Development Especially in the Absence of Environmental Cycles

Deregulated Copper Transport Affects Arabidopsis Development Especially in the Absence of Environmental Cycles

Global Identification of DELLA Target Genes during Arabidopsis Flower Development

Comparative analysis of the SBP-box gene families in P. patens and seed plants

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