Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer).
PILS are emerging auxin transporters that can modulate the intracellular auxin distribution in Arabidopsis. The authors now link these proteins to a developmental process, the apical hook opening in response to light, and to phytochrome signalling.
Ethylene is a plant hormone that promotes fruit ripening. Here, the authors identify pyrazinamide, a drug used to treat tuberculosis, as an inhibitor of ethylene biosynthesis in Arabidopsis thaliana and present the crystal structure of its active form (pyrazinecarboxylic acid) bound to ACC oxidase.
The phytohormone auxin is sensed by SCFTIR1-AUX/IAA receptors leading to AUX/IAA repressor ubiquitylation and turnover. Here the authors show that IAA6 and IAA19 differ in their ubiquitylation and turnover dynamics, differentially contributing to auxin sensing and enabling discrimination of auxin concentrations.
A genetic screen in the model panicoid grass Setaria viridis reveals the importance of the auxin transporter AUX1 for inflorescence branching in maize, highlighting how model plants can accelerate gene discovery in complex crops.
Abscisic acid (ABA) dynamically balances plant water use and availability. It is synthesized during water deficit and quickly catabolized into breakdown products previously thought to be largely inactive. New work demonstrates that phaseic acid, a major ABA catabolite, is a weak ABA receptor agonist with its own auxiliary role in water relations.