“…Knowledge about signaling pathways that operate during pollen tube growth following self-incompatible and compatible pollinations has increased considerably in recent years (Hiscock and Allen, 2008), but the molecular basis underlying the production of female signals, and how pollen tubes perceive and decode them to correctly target the embryo sac, remain largely unknown. The transcriptional profiles of pollen (Becker et al, 2003;Twell, 2003, 2004;Pina et al, 2005; for review, see Becker and Feijó , 2007), embryo sac (Yu et al, 2005;Johnston et al, 2007;Jones-Rhoades et al, 2007;Steffen et al, 2007), pistil (Scutt et al, 2003;Tung et al, 2005), and embryo or seed developmental stages (Chen et al, 2001;Hennig et al, 2004;Yoshida et al, 2005, Le et al, 2010 were recently analyzed.…”