Sap transport proteins. Recent evidence indicates that mobile proteins and RNA are part of the plant's long-distance communication signaling system. Evidence also exists for the directed transport and sorting of macromolecules as they pass through plasmodesmata." A large number of insects of the order Hemiptera (the half-wings), feed directly on phloem sap, and make it the primary component of their diet. Phloem sap is "nutrient-rich compared with many other plant products and generally lacking in toxins and feeding deterrents, [yet] it is consumed as the dominant or sole diet by a very restricted range of animals". This apparent paradox is explained
The Sap (1929 film) The Sap (1929 film) The Sap is a 1929 American comedy film directed by Archie Mayo and written by De Leon Anthony and Robert Lord. It is based on the 1924 play "The Sap" by William A. Grew. The film stars Edward Everett Horton, Alan Hale Sr., Patsy Ruth Miller, Russell Simpson, Jerry Mandy and Edna Murphy. The film was released by Warner Bros. on November 9, 1929. The sap, unemployed and hapless Bill Small, is not regarded by his wife Betty and her relatives. But he is redeemed by a wise stock investment in wheat which reverses his fortunes