西亚试剂：Glutamate Receptor–Like Genes Form Ca2+ Channels in Pollen

Glutamate Receptor–Like Genes Form Ca2+ Channels in Pollen Tubes and Are Regulated by Pistil d-Serine

Michard, Erwan; Lima, Pedro T.; Borges, Filipe; Silva, Ana Catarina; Portes, Maria Teresa; Carvalho, Jo?o E.; Gilliham, Matthew; Liu, Lai-Hua; Obermeyer, Gerhard; Feijó, José A

Elevations in cytosolic free calcium concentration ([Ca2+]cyt) constitute a fundamental signal transduction mechanism in eukaryotic cells, but the molecular identity of Ca2+ channels initiating this signal in plants is still under debate. Here, we show by pharmacology and loss-of-function mutantsthat in tobacco and Arabidopsis, glutamate receptor–like channels (GLRs) facilitate Ca2+ influx across the plasma membrane, modulate apical [Ca2+]cyt gradient, and consequently affect pollen tube growth and morphogenesis. Additionally, wild-type pollen tubes grown in pistilsof knock-out mutants for serine-racemase (SR1) displayed growth defects consistent with a decrease in GLR activity. Our findings reveal a novel plant signaling mechanismbetween male gametophyte and pistil tissue similar to amino acid–mediated communication commonly observed in animal nervoussystems.

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