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What is pollen pistil interaction?
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Sexual reproduction in flowering plants
What is pollen pistil interaction?
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POLLEN PISTIL INTERACTION
After
pollination
, the
pollen grain
gets deposited on the
stigma.
It is
two-celled
having a larger
tube cell
and smaller
generative cell.
The
sugary secretions
produced on the stigma
stimulate
the
germination
of the pollen grain.
The inner covering intine produces a
pollen tube
which comes out through a
germ pore.
The
tube nucleus
enters the pollen tube first, followed by
generative nucleus.
Soon, the tube cell disintegrates, while the generative nucleus divides by mitosis to produce
two haploid male gametes.
The pollen tube with its contents, i.e. tube nucleus, cytoplasm and two male gametes is called
male gametophyte.
The pollen tube bores its way through the
stigma
and passes down though the
style
towards the ovary.
After reaching the ovary, the pollen tube enters the ovule through the
micropyle (Porogamy)
and then enters one of the
synergids
through
the filiform apparatus
.
The
extensive infoldings
of the wall in the
synergids
at the micropylar end is called the
filiform apparatus.
It plays an important role in attracting the pollen tube.
All the sequence of events from the deposition of pollen on the stigma till the entry of pollen tube in the ovule together is referred to as
‘Pollen Pistil interaction’.
Image Source:
http://jxb.oxfordjournals.org/content/early/2010/02/24/jxb.erq021/F1.expansion.html
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Lifeeasy Authors
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The ability of the pistil to recognise the pollen followed by its acceptance or rejection is the result of a continuous dialogue between pollen grain and the pistil
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anonymous
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