Recent Posts

Nanoscale movements of cellulose microfibrils in primary cell walls ($)

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Cell walls are complex mixtures of cellulose microfibrils, proteins and other materials. Their mechanical properties can be measured and modeled, but it is not always simple to translate these measurements to changes at the molecular level. Zhang et al. used atomic force microscopy to provide an unprecedented…

Going my own way: Ethylene-independent ACC signaling in pollen tube attraction (Nature Comms.)

1-Aminocyclopropane-1-carboxylic acid (ACC) is the precursor of the phytohormone ethylene. Here, Mou and co-workers show ACC to act independent of ethylene in the ovule to attract growing pollen tubes. Mutants impaired in ACC biosynthesis had less fertilization and seed setting events. Fertilization…

Calcium binding by arabinogalactan polysaccharides is important for normal plant development (Plant Cell)

Arabinogalactan proteins (AGPs) are a class of apoplastic carbohydrate-binding proteins with a carbohydrate portion that can also bind to calcium (Ca2+) ions in a pH-dependent manner. Here, Lopez-Hernandez and colleagues have probed the role of AGPs and the functional significance of their Ca2+-binding…

Spatial profiling of immune competence in plant roots (bioRxiv)

Plant roots should prevent immune activation by innocuous soil microbiota, as constitutive immune activation is harmful to plant growth. Previous studies have indicated variable immune competence of different root cell types and developmental zones, but this is currently poorly understood with the fine…

A calmodulin-gated calcium channel links pathogen patterns to plant immunity ($) (Nature)

Calcium ions mediate calcium-based defense responses in pattern triggered immunity (PTI) upon detection of pathogen patterns by plant surface receptors. A new study by Tian et al. has elucidated the molecular events that activate the calcium response. The authors show that adequeate calcium nutrient…

A chloroplast-localized mitochondrial calcium uniporter transduces osmotic stress in Arabidopsis (Nature Plants)

Calcium and chloroplasts are both at the heart of the signal transduction during environmental stress. Teardo et al. studied whether the chloroplast-localized mitochondrial calcium uniporter has a role in stress signaling. The group identified 6 homologs of mitochondrial calcium uniporter (MCU) in Arabidopsis,…

Plant Calcium Channels Perceive the Hungry Caterpillar

Meena et al. identify a Ca2+ channel involved in herbivory recognition. Plant Cell https://doi.org/10.1105/tpc.19.00057 By Mukesh Kumar Meena, Ramgopal Prajapati, Deepthi Krishna and Jyothilakshmi Vadassery are from National Institute of Plant Genome Research (NIPGR), New Delhi, India Background:…