The nucleus of the pollen grain passes through the pollen tube and joins with the egg cell inside an ovule in the ovary. Fruit comes from flowering plants, and it is grown in the following process ...

The pollen grain then germinates into a tube that guides the male reproductive cells to the depths of the ovary, picking up signals along the way that reveal the location of an ovule. Blocking signals ...

The recent study from Japan used advanced imaging techniques to show that protein signals guide a pollen tube to an individual ovule within the ovary, through a process called chemotaxis.

To its right is a 3.4-millimetre-wide cross-section of a blue passion flower (Passiflora caerulea) ovary, stuffed with mature ...