Pollen tube growth question

arron kcchin at pacific.net.sg
Fri Apr 21 03:19:10 EST 2000

> The pollen tube is the extension of a single cell of the pollen grain
> (or male gametophyte) the tube cell.   You can demonstrate that this
> growth does not require any contribution of the style other than
> sucrose, calcium, and boron, since pollen grains of many species will
> successfully germinate in a liquid medium containing these three
> ingredients.  
If 'Growth' does imply also -tropism, then there must be  'factor/s' other than
the sucrose, calcium and boron. For the pollen tube does grow dirrectly towards
the ovules...............

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