Do green spathes assimilate?

Hello,
 
Many aroids have green spathes and usually they are the tallest parts of the plants.
In deep shade in forests spathes are often green, olive-green, brown, it indicates the presence of chlorophyll.
Some other aroids' spathes turn green as the flowers become pollinated (like Spathiphyllum).
Do the green spathes play a role in assimilation?
 
Marek
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