Recent Posts

Mechanism and function of root circumnutation (PNAS)

This is an engrossing paper. The authors start off with a simple mutant screen for abnormal root growth in rice seedlings, through which they identified three “long root” mutant alleles of a rice mutant in a gene encoding a histidine kinase, HK1. Careful analysis showed that the mutant roots fail…

Differential biosynthesis and cellular permeability explain longitudinal gibberellin gradients in growing roots (PNAS)

Gibberellin (GA) controls multiple developmental processes throughout the plant life cycle, from seed germination to flowering. In Arabidopsis, GA also regulates division of meristematic cells at the tip of the root and cell elongation in the growing zone. Despite its importance, little is known about…

Microbiota-root-shoot axis modulation by MYC2 favors Arabidopsis growth over defense under suboptimal light (bioRxiv)

Microbiota-root-shoot axis modulation by MYC2 favors Arabidopsis growth over defense under suboptimal light Below- and aboveground plant organs experience distinct biotic and abiotic environments. Thus, coordination between root and shoot responses are likely crucial for plant survival. Given that…

CLAVATA signaling ensures reproductive development in plants across thermal environments (Curr. Biol.)

Plant reproduction and development requires robust signaling pathways that integrate environmental queues such as temperature. In Arabidopsis, the formation of flower primordia from the inflorescence meristem (IM) depends on the proliferation/ differentiation balance and is regulated by auxin and the…

CAMEL in the canal: Regulation of PIN proteins during canalization (Science)

Auxin transport during development or wound regeneration is known to require auxin-induced channel or ‘canal’ formation that includes polar localization of PIN auxin transport proteins. Hajný and colleagues have characterized a receptor-like kinase (RLK) complex involved in auxin-induced pattern…

Ethylene independent functions of ACC in Marchantia polymorpha (Nature Plants)

Ethylene is synthesized from 1-Aminocyclopropane carboxylic acid (ACC), and ACC has long been used as a substitute to induce ethylene responses. In a new study, Li and colleagues show that ACC functions as a stand-alone signaling molecule in the liverwort Marchantia. While treatment with ethylene…

SPLICEd in the Seeds: Integration of ABA and Light Signaling in Arabidopsis

Dhineshkumar Thiruppathi 1,2  ORCID ID: 0000-0002-2018-3356 Donald Danforth Plant Science Center, Saint Louis, Missouri 63132 1Author for contact: dthiruppathi@danforthcenter.org 2Lead author Plant development and adjustment to the environment require not only tight regulation of core…

A protein engineering approach for elucidating receptor protein signaling function (Plant Cell)

Plant cells express an array of membrane-bound receptor proteins that recognize and respond to extracellular cues. However, their varied structure/specificity and methods of activation pose challenges in assessing their function. Focusing on Leucine-Rich Repeat Receptor Kinases (LRR-RKs), Hohmann et…

Structural basis of salicylic acid perception by Arabidopsis NPR proteins (Nature) ($)

Salicylic acid (SA) is a critical hormone in plant-pathogen responses. The main receptors of this hormonal signal are a small family of NPR proteins (NONEXPRESSOR OF PATHOGENESIS-RELATED GENES). Although NPR1 is a positive regulator of defense signaling, NPR3 and NPR4 serve as negative regulators; they…