Definition of pollen tube in English:

pollen tube

noun

Botany
  • A hollow tube which develops from a pollen grain when deposited on the stigma of a flower. It penetrates the style and conveys the male gametes to the ovule.

    • ‘In pre-zygotic mechanisms, the pollen tube may grow as far as the ovule but not penetrate it, or penetration may be achieved without fertilization.’
    • ‘In only one pollination did a pollen tube appear to enter the ovary, but not the ovule.’
    • ‘For example, low temperatures near flowering affect ovule development and pollen tube growth.’
    • ‘Guidance of the pollen tube down the style involves mechanical, chemical and physical cues that are not yet fully understood.’
    • ‘The grain is empty because the body cell and prothallial nuclei have moved out along the pollen tube towards the archegonia.’

Pronunciation:

pollen tube

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