Assertion: gametophyte's nucleus | /r/HasProperty | christensen et al.
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text: ; Shi et al. , 2005), cell formation (Hejatko et al. , 2003; Kim et al. , 2005; Pischke et al. , 2002), fusion of the polar nuclei (Christensen et al. , 2002; Niewiadomski et al. , 2005; Portereiko et al. , 2006b), cell death (Christensen et al. , 2002), and DNA demethylation (Choi et al. , 2002; Gehring et al. , 2006), or in reproductive functions such as regulation of the initiation of endosperm development (Grossniklaus et al. , 1998; Luo et al. , 1999; Ohad et al. , 1999), pollen tube guidance (Marton et al. , 2005), and control of pollen tube growth within the female gametophyte (Huck et al. , 2003; Rotman et al. , 2003).