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Question

A pollen lands from anther to stigma of a flower, however there is no pollen tube formation. What is the reason behind this?
  1. No synchrony between pollen release and stigma receptivity
  2. Pollen is no longer viable
  3. Self-incompatibility
  4. Any of the above


Solution

The correct option is D Any of the above
The pollen after landing on the stigma undergoes a series of chemical interactions with the stigma.

If the pollen is compatible, then the pollen tube formation is facilitated.

In certain species, the pollen grain from the same flower is considered self-incompatible and is rejected. In such cases the pollen tube formation does not take place. 

There is no pollen tube formation if the stigma is not receptive when the pollen grain is released.

If a pollen grain is no longer viable, it won't be able to germinate to give rise to the pollen tube.  

 

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