An extracellular transglutaminase is required for apple pollen tube growth

Alessia Di Sandro, Stefano Del Duca, Elisabetta Verderio, Alan J. Hargreaves, Alessandra Scarpellini, Giampiero Cai, Mauro Cresti, Claudia Faleri, Rosa A. Iorio, Shigehisa Hirose, Yutaka Furutani, Ian G.C. Coutts, Martin Griffin, Philip L.R. Bonner, Donatella Serafini-Fracassini