Smyth D R
Department of Genetics and Developmental Biology, Monash University, Clayton Melbourne, Victoria 3168 Australia.
Curr Biol. 1997 Feb 1;7(2):R64-6. doi: 10.1016/s0960-9822(06)00037-6.
The guidance of a pollen tube through the female flower to reach an ovule is genetically controlled and occurs only if the ovule's embryo sac has developed, suggesting that the embryo sac is the source of a specific pollen tube attractant.
花粉管穿过雌花到达胚珠的过程受基因控制，并且只有在胚珠的胚囊发育成熟时才会发生，这表明胚囊是特定花粉管吸引剂的来源。
