The hypothesis put forth by Fensom and Willia | vedclass

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(A) Fensom and Williams $(1974)$ proposed the contractile protein hypothesis for phloem transport.They observed a network of interlinked microfibrils

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Contractile protein

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(A) Fensom and Williams $(1974)$ proposed the contractile protein hypothesis for phloem transport.They observed a network of interlinked microfibrils in the sieve tube elements.These microfibrils were composed of contractile threads of $P$-protein,which are believed to facilitate the movement of sap through the sieve tubes via rhythmic contractions.

The hypothesis put forth by Fensom and Williams is:

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