Nurse cell–derived small RNAs define paternal epigenetic inheritance in Arabidopsis (Science)
Plant Science Research WeeklyNew mechanisms for the production and function of small RNAs continue to be discovered. Previous studies have shown a role for small RNAs in methylation reprogramming. Recently, Long et al. found that the epigenetic reprogramming that takes place in the male reproductive tissues also involves mobile…
A tale of two morphs: seed coat differentiation in the dimorphic diaspore model Aethionema arabicum (Brassicaceae) (Plant J.)
Plant Science Research WeeklyWhile most plants have a single fruit and seed form, several species produce two or more distinct fruit and seed types, although the mechanisms behind this phenomenon remain unknown. Here, Arshad and colleagues assess the differences in the internal morphology and transcriptomic profile throughout development…
Review: Postzygotic reproductive isolation established in the endosperm: mechanisms, drivers and relevance ($) (Phil. Trans. R. Soc. B)
Plant Science Research WeeklyIn this fascinating review, Köhler and colleagues show us that the seed endosperm is not only a nutritive tissue that supports embryo growth, it also nourishes the course of plant evolution. When closely related species or species with different ploidy levels hybridize, endosperm development deviates…
LEAFY is a pioneer transcription factor and licenses cell reprogramming to floral fate (Nature Comms)
Plant Science Research WeeklyMaster transcription factors (TFs) can activate specific genetic programs to reprogram cellular fate in the context of open chromatin. A special class of these proteins known as pioneer TFs are defined by their ability to trigger cell fate reprogramming by binding their cognate cis motifs in a nucleosome…
Longer telomeres, earlier flowering: Natural variation in plant telomere length is associated with flowering time (Plant Cell)
Plant Science Research WeeklyTelomeres (from Greek words meaning "end part") are highly repetitive DNA sequences at chromosome ends that guard against degeneration during cell division. Though all eukaryotes possess telomeres, extensive interspecific variation exists for telomere lengths (300bp in yeast to 150kb in tobacco). Telomere…
TERMINAL FLOWER 1-FD complex target genes and competition with FLOWERING LOCUS T (Nat. Commun.)
Plant Science Research WeeklyThe onset of reproductive development is tightly regulated in response to environmental cues as early and delayed flowering greatly affects seed production. In Arabidopsis, the timing of flower formation is controlled by members of the Phosphatidyl Ethanolamine-Binding Protein (PEBP) family: TERMINAL…
Review: La vie en roses, lilies, and other flowers: the floral microbiome (Annu. Rev. Ecol. Evol. Syst.)
Plant Science Research WeeklyBeyond their beautiful colors, fragrances and shapes, flowers also can host a great variety of life forms. A diverse community of bacteria, fungi, protozoa, and other organisms live in the flowers. A recent work by Rachel Vannette summarizes the current studies about the floral microbiome, highlighting…
A peptide pair coordinates regular ovule initiation patterns with seed number and fruit size (Curr. Biol.)
Plant Science Research Weekly
In Arabidopsis pistils, ovule primordia differentiate from the placenta - meristematic tissue within the two fused carpels - in parallel rows with a regular spacing of 2-4 cells. Since fruit growth and ovule formation determine the maximum number of seeds enclosed in a silique, these two processes…
Review. Imaging flowers: a guide to current microscopy and tomography techniques to study flower development (J. Exp. Bot.)
Plant Science Research WeeklyFlowers bear the reproductive organs and determine the reproductive success of plants by producing fruits and seeds. Flowers usually include four whorls of organs: sepals, petals, stamen and carpel. In this review, Prunet and Duncan discuss various microscopic and tomographic techniques to image flower…