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Journal of Experimental Biology 86,225-236 (1980)
Published by Company of Biologists 1980

Studies on Locust Rectum : II. Identification of Specific Ion Transport Processes Regulated by Corpora Cardiaca and Cyclic-AMP

J. H. SPRING ¹ and J. E. PHILLIPS ²

¹ Deparytment of Zoology, University of Britsih Columbia, B.C., Canada V6T 1W5
² Department of Zoology, University of British Columbia Vancouver, B.C., Canada V6T 1W5

Please send reprint requests to J. E. Phillips.

1. The unidirectional fluxes of ³⁶Cl^- and ²²Na⁺ across short-circuited locust recta bathed in a simple NaCl saline were followed with time. Unidirectional fluxes and net flux of ²²Na⁺ to the haemocoel side all remained constant for at least 4 h and were unaffected by either corpora cardiaca homogenate (CC) or cAMP.

2. Both CC and cAMP stimulated influx and net flux of ³⁶Cl^- to the haemocoel side. Over the whole time course of the experiment, i.e. both before and after stimulation, net Cl^- flux approximately equalled the shortcircuit current (I_SC).

3. Neither CC nor cAMP caused substantial stimulation of I_SC or transepithelial electropotential difference (PD) if all Cl^- in the bathing saline was replaced by either sulphate or nitrate or acetate.

4. Acetate saline sustains I_SC, PD and transepithalial resistance (R) at higher levels than does simple Cl-saline.

5. Experiments with Cl-free, SO₄-salines suggest that alternate electrogenic transport processes can be slowly turned on when Cl^- is absent, provided a complex saline which contains several organic constituents, or simple acetate saline, is present.