Entries by Rory Burke

Robust transcriptional indicators of immune cell death revealed by spatio-temporal transcriptome analyses (Mol Plant)

Many plants trigger a form of cell death, known as the hypersensitive response (HR), immediately upon pathogen recognition. To minimize damage to the plant, this cell death must be highly localized to the site of attack, while more distal cells survive and activate other immune responses. However, the transcriptomic programs underlying these disparate cell fates […]

Spermine inhibits PAMP ROS and Ca2+ burst and reshapes the transcriptional landscape of PAMP-triggered immunity in Arabidopsis (bioRxiv)

Polyamines are endogenous cationic amines that have been shown to regulate a plethora of biological processes in plants, including the hypersensitive response. However, the importance of polyamines in other aspects of plant immunity has not yet been fully explored. In this new preprint, Zhang and colleagues examine the role of two polyamines, spermine and putrescine, […]

A mitochondrial RNA processing protein mediates plant immunity to a broad spectrum of pathogens by modulating the mitochondrial oxidative burst (Plant Cell)

Phytophthora are a group of oomycete pathogens that infect a wide range of plants and cause disease in many important crop species. Large scale mutant screens have previously been used to identify Arabidopsis thaliana mutants with enhanced resistance to P. parasitica. Here, Yang and colleagues investigate the mechanisms underlying resistance in one such mutant, rtp7. […]

Chloroplast protein import determines plant proteostasis and retrograde signaling (bioRxiv)

The neurological condition Huntington’s disease is caused by mutated versions of the Huntingtin gene that encode expanded stretches of polyglutamine repeats, resulting in protein aggregation. However, despite the widespread presence of polyglutamine repeat regions in plant proteomes, similar pathologies have yet to be observed. To investigate this paradox, Llamas and colleagues expressed aggregation-prone fragments of […]

Arabidopsis CHROMATIN REMODELING 19 acts as a transcriptional repressor and contributes to plant pathogen resistance (Plant Cell)

Chromatin remodellers are highly conserved eukaryotic proteins with regulatory roles in various aspects of DNA metabolism including DNA repair, gene expression and mitosis. Here, Kang et al. examine the function of the CHROMATIN REMODELLING19 (CHR19) in Arabidopsis thaliana. Using two T-DNA insertion lines, the researchers first showed that unlike its animal and yeast homologues, CHR19 […]

Flavodiiron proteins enhance the rate of CO2 assimilation in Arabidopsis under fluctuating light intensity (Plant Physiol)

Plants must adjust to varying levels of light in order to optimize photosynthetic rates; too little electron transport and plants will incur an energetic penalty, while excessive excitation of photosystem I leads to photodamage. During high light conditions, the increase in DpH acts as a brake on electron transport via acidification of the thylakoid lumen. […]

Ethylene augments root hypoxia tolerance through amelioration of reactive oxygen species and growth cessation (bioRxiv)

Flooding presents a dual threat to plants; not only is mitochondrial respiration supressed during the resulting hypoxic conditions, but once the floodwaters recede, the return to ambient oxygen levels triggers a cascade of harmful reaction oxygen species (ROS). One of the most well-studied responses to flooding stress is the accumulation of the gaseous hormone ethylene. […]

CLAVATA modulates auxin homeostasis to regulate stem cell identity in a moss (New Phytol.)

The size and shape of aerial organs in angiosperms is determined by the activity of shoot apical meristem cells. The mechanism by which this cell population is maintained has been well described in Arabidopsis, and involves a negative feedback loop of diffusible CLAVATA peptides and the transcription factor WUSCHEL. However, in bryophytes WUSCHEL is not […]