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Phloem sap moves from source to sink under pressure.1. Aphids, an insect that annoys gardeners,...

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Biology

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Phloem sap moves from source to sink under pressure.1. Aphids, an insect that annoys gardeners, have helped demonstrate that organiccompounds flow under pressure in the phloem. Analysis of the fluid emerging from aphidstylets (liquid aphids were consuming) verified that in most plant species, sucrose is themain carbohydrate being translocated through the phloem. The contents of sieve tubeswere found to be under high pressure, often five times as much as in an automobile tireIn flowering plants, sucrose-laden phloem sap flows from a starting location, called theto another site, called thealong gradients ofdecreasing solute concentration and pressure. The pressure flow mechanism builds up atthe source end of a sieve tube system and pushes those solutes by bulk flow toward asink, where they are removed

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