Abstract:
:Mutations affecting the Arabidopsis SWC6 gene encoding a putative orthologue of a component of the SWR1 chromatin remodelling complex in plants have been characterized. swc6 mutations cause early flowering, shortened inflorescence internodes, and altered leaf and flower development. These phenotypic defects resemble those of the photoperiod independent early flowering 1 (pie1) and early in short days 1 (esd1) mutants, also affected in homologues of the SWR1 complex subunits. SWC6 is a ubiquitously expressed nuclear HIT-Zn finger-containing protein, with the highest levels found in pollen. Double mutant analyses suggest that swc6 abolishes the FLC-mediated late-flowering phenotype of plants carrying active alleles of FRI and of mutants of the autonomous pathway. It was found that SWC6 is required for the expression of the FLC repressor to levels that inhibit flowering. However, the effect of swc6 in an flc null background and the down-regulation of other FLC-like/MAF genes in swc6 mutants suggest that flowering inhibition mediated by SWC6 occurs through both FLC- and FLC-like gene-dependent pathways. Both genetic and physical interactions between SWC6 and ESD1 have been demonstrated, suggesting that both proteins act in the same complex. Using chromatin immunoprecipitation, it has been determined that SWC6, as previously shown for ESD1, is required for both histone H3 acetylation and H3K4 trimethylation of the FLC chromatin. Altogether, these results suggest that SWC6 and ESD1 are part of an Arabidopsis SWR1 chromatin remodelling complex involved in the regulation of diverse aspects of plant development, including floral repression through the activation of FLC and FLC-like genes.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Lázaro A,Gómez-Zambrano A,López-González L,Piñeiro M,Jarillo JAdoi
10.1093/jxb/erm332subject
Has Abstractpub_date
2008-01-01 00:00:00pages
653-66issue
3eissn
0022-0957issn
1460-2431pii
erm332journal_volume
59pub_type
杂志文章abstract::Flowering is a critical period in the life cycle of flowering plant species, resulting in an irreversible commitment of significant resources. Wheat is photoperiod sensitive, flowering only when daylength surpasses a critical length; however, photoperiod insensitivity (PI) has been selected by plant breeders for >40 y...
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doi:10.1093/jxb/erq270
更新日期:2011-01-01 00:00:00
abstract::When plants encounter compacted soil, stomatal closure occurs and shoot growth slows. These responses occur in the absence of detectable changes in foliar water status. The use of genotypes with a reduced capacity to synthesize either ABA or ethylene has provided convincing evidence that ABA is responsible for providi...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:
更新日期:2002-01-01 00:00:00
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journal_title:Journal of experimental botany
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更新日期:2014-07-01 00:00:00
abstract::In grapevine, stimulation of defence responses was evidenced in response to various types of abiotic stresses in both leaves and berries, as revealed by the increasing expression of genes encoding defence-related proteins or the stimulation of their corresponding activities. However, the capability of inflorescences t...
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更新日期:2009-01-01 00:00:00
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journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erv057
更新日期:2015-03-01 00:00:00
abstract::Plants show varied cellular responses to salinity that are partly associated with maintaining low cytosolic Na(+) levels and a high K(+)/Na(+) ratio. Plant metabolites change with elevated Na(+), some changes are likely to help restore osmotic balance while others protect Na(+)-sensitive proteins. Metabolic responses ...
journal_title:Journal of experimental botany
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doi:10.1093/jxb/erp243
更新日期:2009-01-01 00:00:00
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abstract::Storage of phosphorus (P) in stem tissue is important in Mediterranean Proteaceae, because proteoid root growth and P uptake is greatest during winter, whereas shoot growth occurs mostly in summer. This has prompted the present investigation of the P distribution amongst roots, stems, and leaves of Hakea prostrata R.B...
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