Entries by Magdalena Julkowska

Gating of miRNA movement at defined cell-cell interfaces governs their impact as positional signals

Small RNAs constitute a unique signal transduction mechanism by targeting specific mRNAs and causing a direct down-regulation of target gene expression. Mobile RNAs are known to act as positional cues in developing tissues or to signal stress responses at the systemic level. Although plasmodesmata serve as miRNA gateways in cell-to-cell movement, we know very little […]

Ectopic BASL reveals tissue cell polarity throughout leaf development in Arabidopsis thaliana

Signals determining tissue polarity are fundamental to proper organ development. Asymmetry across the entire organ  arises due to to polarity fields. Although there are numerous examples of proteins that express preferential polar localization in the cell, the mechanism that coordinates the polarity field across the whole organ level is still unknown. Mansfield et al. used […]

Releasing the Cytokinin Brakes on Root Growth

Roots explore the soil for available water and nutrients, with deep roots providing water from the lower soil layers (Uga et al., 2015) and highly branched roots searching the soil for less-mobile nutrients such as phosphate, zinc, and manganese. Root architecture results from plant developmental programs, which are modified by environmental cues. The development of […]

Lateral root priming synergistically arises from root growth and auxin transport dynamics (bioRxiv)

Root system architecture is primarily determined by branching of the lateral roots. The position of a new lateral root is determined by oscillating auxin concentrations in the main root meristem. To understand the nature of auxin oscillations Van den Berg and ten Tusscher developed a multiscale root model integrating realistic root tip architecture, auxin reflux […]

Auxin methylation is required for differential growth in Arabidopsis

Plants need to navigate and adjust their growth according to the environmental clues, such as light or gravity. Asymmetric distribution of auxin is necessary for organ bending. Abbas and colleagues show that conversion of indole-3-acetic acid (IAA) into methyl-IAA (Me-IAA) is important for asymmetric auxin distribution. Mutation of IAA carboxyl methyltransferase 1 (IAMT1) resulted in […]

Diacylglycerol acyltransferase 1 contributes to freezing tolerance

Low temperature is one of the environmental factors limiting the plant distribution. Yet there are some plants that can survive freezing temperatures, such as Boechera stricta, native to the Rocky Mountains, spread across a broad range of elevations. Arisz and colleagues observed that freezing tolerance was higher in the LTM ecotype (found in the northern […]

Arabidopsis duodecuple mutant of PYL ABA receptors reveals PYL repression of ABA-independent SnRK2 activity

Abscisic acid (ABA) is a plant hormone involved in many plant processes – from seed maturation to drought responses. ABA is perceived by intracellular pyrabactin resistance and PYR-like family (PYR/PYL) receptors, counting 14 genes in Arabidopsis, representing the largest family of plant receptors.  Although individual PYLs differ in their expression patterns, it is hard to […]

Adjusting Boron Transport by Two-Step Tuning of Levels of the Efflux Transporter BOR1

Boron is an essential plant micronutrient with the narrowest optimal range in the soil of any micronutrient. At neutral pH, boron is present as uncharged boric acid, B(OH)3, which can freely penetrate membranes. Boron plays an important role in cross-linking cell wall components, but boron starvation and toxicity affect various metabolic and physiological processes beyond […]