Abstract
Water resorption by the rectum of the desert locust, Schistocerca gregaria, has been studied in vitro in an attempt to elucidate the relationship between solute resorption and apparent active water transport. Uninhibited preparations transported water from lumen to haemolymph against increasing osmotic gradients at about 30 per cent of the rate recorded in vivo. The preparations actively transported sodium but showed no capability for potassium or chloride transport. The water transport was far greater than could result through isosmotic coupling to the observed sodium transport, and continued when the sodium transport was inhibited by 10 −3 M KCN+10 −3 M iodoacetate. Water and sodium transport were not significantly inhibited by 10 −2 M KCN but were inhibited by 10 −2 M iodoacetate suggesting the in vitro preparation utilized anaerobic respiration to energize the water and sodium transport. Dinitrophenol (10 −3 M) inhibited both sodium and water uptake, possibly in a similar fashion to its action in inhibiting anaerobic sodium transport in the turtle bladder. Water transport took place without net accompanying solute movement or when net solute movement was in the opposing direction. These findings are consistent with theories of solute recycling within the epithelium.
Published Version
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