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Regulation of Heterochromatic Silencing and Histone H3 Lysine-9 Methylation by RNAi
TLDR
It is proposed that double-stranded RNA arising from centromeric repeats targets formation and maintenance of heterochromatin through RNAi.
Spatially restricted microRNA directs leaf polarity through ARGONAUTE1
TLDR
It is shown that a 21-nucleotide miRNA that directs cleavage of PHB/PHV messenger RNA accumulates first in the embryonic meristem, and then in the abaxial domain of the developing leaf.
The role of ARGONAUTE1 (AGO1) in meristem formation and identity.
TLDR
Through phenotypic and double mutant analysis, it is shown that AGO1 regulates stem cell function via SHOOT MERISTEMLESS (STM) and CUPSHAPED COTYLEDONS1 and 2 (CUC1 and CUC2) positively regulate STM and are targets of miRNA.
The developmental role of microRNA in plants.
TLDR
Over the past year, the list of known miRNAs, confirmed targets and developmental effects has expanded, as has the realization that they are conserved during evolution and that small RNAs can play a direct role in cell-cell signaling.
Mixing and matching pathways in leaf polarity.
TLDR
Analysis of conserved genetic pathways involving small regulatory RNAs and several distinct transcription factor families in different model organisms reveals a surprising diversity in the genetic control of such a fundamental developmental process.
Signaling sides adaxial-abaxial patterning in leaves.
TLDR
How recent work in a range of species is clarifying understanding of adaxial and abaxial processes is considered, which suggests that several highly conserved interlocking pathways are involved.
Maintenance of species boundaries in a Neotropical radiation of Begonia
TLDR
It is shown that Begonia demonstrate properties making them exceptionally prone to speciation, at multiple stages along the divergence continuum, not only are populations weakly connected by gene flow, promoting allopatric Speciation, but species often show strong reproductive barriers in secondary contact.
Genetic differentiation and species cohesion in two widespread Central American Begonia species
TLDR
The population genetic data suggest that Begonia populations are only weakly connected by gene flow, allowing reproductive barriers to accumulate between the most isolated populations, supporting allopatric divergence in situ being the precursor of speciation in Begonia.
Using targeted enrichment of nuclear genes to increase phylogenetic resolution in the neotropical rain forest genus Inga (Leguminosae: Mimosoideae)
TLDR
It is concluded that targeted enrichment provides the large volumes of phylogenetically-informative sequence data required to resolve relationships within recent plant species radiations, both at the species level and for within-species phylogeographic studies.
bundle sheath defective, a mutation that disrupts cellular differentiation in maize leaves
TLDR
It is proposed that induction of the C4 state restricts B SD1 gene action to bundle sheath cells, which suggests that, during normal development, the Bsd1 gene directs the morphological differentiation of chloroplasts in a light-independent and bundle she Heath cell-specific fashion.
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