Recent Posts

Discarding unwanted organs is a highly regulated process in plants (Cell)

Plants frequently, seasonally, discard unwanted organs (termed abscission), which include dead leaves, flowers and ripe fruit. Abscission requires tight control to avoid exposure to biotic and abiotic factors, which can lead to tissue damage or infection. Due to the presence of the cell wall, plant cells…

Novel functions of TCP5 in petal development and ethylene biosynthesis (Plant J.)

The flower is one of the most important organs of a plant as it provides fruits and seeds. Due to its economic value, flowers are studied extensively to understand its developmental process. Based on the popular ABC model of flower development, floral organ development is mostly regulated through the…

CLERK is a novel receptor kinase required for sensing of root-active CLE peptides in Arabidopsis (Development)

Small secreted peptides including CLEs have been identified as contributing to plant development. CLE26 and CLE45 have been shown to regulate protophloem differentiation in the root tip. Anne et al. used a combination of genetic screening and transcriptomics to identify factors downstream of these peptides.…

ONE GENE: DIFFERENT mRNAs, DIFFERENT TISSUES, DIFFERENT FUNCTIONS IN DEVELOPMENT

Napoli et al. show that mRNA splicing variants have tissue- and developmental stage-specific activity in flower development https://doi.org/10.1105/tpc.17.00840. By Roberta Ghelli and Patrizia Brunetti Background: Plants that are self-pollinating contain both male (stamen) and female (pistil)…

Switching off Seed Maturation Genes in Seedlings

Chen et al identify AGL15 as a direct target of HSI2-dependent transcriptional repression in Arabidopsis seedlings https://doi.org/10.1105/tpc.17.00655. By Naichong Chen and Randy Allen Background: The developmental transition from seeds to seedlings is a critical step in the plant life cycle.…

Review: Auxin: a molecular trigger of seed development (Genes Devel.) ($)

Seeds are hugely important, providing the opportunity for reproductive dormancy in seed-bearing plants and as a nutrient-dense food source for animals. Seed development involves the formation of three genetically distinct tissues, the embryo, seed coat and endosperm. Although normally dependent on fertilization…

DNA methylation dynamics during early plant life

DNA methylation is extensively reprogrammed in the early embryo and germlines of mammals, whereas flowering plants do not show such extensive resetting except in the endosperm. Active DNA demethylation in the central cell and reduced activity of DNA methyltransferases leads to global hypomethylation…

Extensive transcriptomic and epigenomic remodelling occurs during Arabidopsis thaliana germination

Understanding the complex regulatory mechanisms that contribute to germination and seedling establishment requires integration of gene-expression, transcription factors (TFs), DNA methylation, smallRNA data, and their interactions. Narsai et al. describe the first dynamic transcription factor network…

Maternal components of RdDM are required for seed development in Brassica rapa

RNA directed DNA methylation (RdDM) is an epigenetic process in which plant double-strand RNAs are processed into small RNAs (sRNA) that add repressive DNA methylation to homologous DNA sequences. RdDM primarily acts on repetitive DNA and transposable elements (TEs). Despite its important biological…