What is pollen pistil interaction? describe in detail

CBSE Class 12 CBSE Class 12 Biology
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what is pollen pistil interaction? describe in detail

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Pollen-Pistil Interaction

  • Pollen-pistil interaction is a sequence of events that occur from the time of pollen deposition over the stigma till the time of entry of pollen tube inside the ovule.

  • The process has checks at several places for the promotion or inhibition of pollen growth.

    Advantages

  • It is helpful to the plant breeders in manipulating pollen growth even in incompatible cases.

  • It is a safety measure to ensure that illegitimate crossings do not take place.

  • Compatibility and incompatibility of the pollen-pistil is determined by special proteins.

  • Compatible pollens absorb water and nutrients from the surface of stigma, germinate and produce pollen tube.

  • Pollen tube grows into the style whose growth and path is determined by specific chemicals.

Entry of Pollen tube into the Embryo sac

  • The fully developed embryo sac consists of 3 antipodal cells, 2 synergids, 1 egg cell and 1 secondary nucleus.
  • The pollen tube pierces through the nucellus and ultimately, penetrates the wall of the embryo sac.
  • The tip of the pollen tube disintegrates and the 2 male gametes are liberated in the embryo sac.
  • One or both the synergids which help in directing the pollen tube towards the egg disintegrates