THE EFFECT OF DIETARY PROTEIN LEVELS AND HAEMOLYMPH COMPOSITION ON THE SENSITIVITY OF THE MAXILLARY PALP CHEMORECEPTORS OF LOCUSTS
THE EFFECT OF DIETARY PROTEIN LEVELS AND HAEMOLYMPH COMPOSITION ON THE SENSITIVITY OF THE MAXILLARY PALP CHEMORECEPTORS OF LOCUSTS
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膳食蛋白质水平和血淋巴成分对蝗虫上颌须化学感受器敏感性的影响
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
S. J. Simpson
中科院分区：
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作者：
J. Abisgold;S. J. Simpson
1.以往的研究表明，东亚飞蝗（Locusta migratoria（L.）通过减少肉间间隔来补偿稀释的膳食蛋白质（Simpson & Abisgold，1985）。2.膳食蛋白质对餐间间隔的影响直接或间接受血淋巴的渗透压和游离氨基酸含量的调节（Abisgold & Simpson，1987）。3.膳食蛋白质和血淋巴成分的水平影响的可能性，下颚须味觉受体的反应进行了调查。4.喂食低蛋白饮食的昆虫有明显更大的受体反应（以感器刺激的第一秒内的尖峰总数测量）对0.0125 mol-1亮氨酸/0.05 mol-1 NaCl、单独0.05 mol-1 NaCl或0.025 mol-1蔗糖/0.05 mol-1 NaCl的刺激的影响，尽管对于两种饮食，对蔗糖的反应显着低于对其他两种溶液的反应。5.通过注射将低蛋白质喂养的蝗虫血淋巴的游离氨基酸谱增加到高蛋白质喂养的蝗虫血淋巴的游离氨基酸谱，显著降低了受体对随后注射的10种氨基酸中的8种的0.0125 mol −1混合物刺激的反应，但没有降低对0.025 mol −1蔗糖在0.05 mol −1 NaCl中的刺激的反应。这种降低与注射对血液渗透压的影响无关，并在注射后持续50分钟。6.单独对0.05 moll −1 NaCl的反应受到血液氨基酸水平和渗透压的增加的影响，但这种影响不如对氨基酸刺激反应的特异性降低显著。7.可能的意义减少受体的敏感性对摄食行为和血液渗透压和游离氨基酸含量的相对作用进行了讨论。注：现地址：海外开发自然资源研究所，学院大楼，Wrights Lane，伦敦VV 8 5SJ。
1. Previous work has shown that fifth-instar nymphs of Locusta migratoria (L.) compensate for a dilution of their dietary protein by reducing intermeat interval (Simpson & Abisgold, 1985). 2. The effect of dietary protein on intermeal interval is regulated, either directly or indirectly, by the osmolality and free amino acid content of the haemolymph (Abisgold & Simpson, 1987). 3. The possibility that levels of dietary protein and haemolymph composition affect the response of the maxillary palp gustatory receptors is investigated. 4. Insects fed a low-protein diet had a significantly greater receptor response (measured as the total number of spikes in the first second of stimulation of a sensillum) to stimulation with 0.0125 moll −1 leucine in 0.05 moll −1 NaCl, 0.05 moill −1 NaCl alone or 0.025 moll −1 sucrose in 0.05 moll −1 NaCl than did insects fed a high-protein diet, although for both diets the response to sucrose was significantly lower than the response to the other two solutions. 5. Increasing the free amino acid profile of the haemolymph of a low-protein-fed locust up to that of a high-protein-fed locust by injection markedly reduced the response of the receptors to subsequent stimulation with a 0.0125 moll −1 mix of eight of the 10 amino acids injected, but did not reduce the response to stimulation with 0.025 moll −1 sucrose in 0.05 moll −1 NaCl. This reduction was independent of the effect of injection on blood osmolality and was sustained for 50min after the injection. 6. The response to 0.05 moll −1 NaCl alone was influenced both by increases in blood amino acid levels and by osmolality, but the effect was less marked than the specific reduction in response to amino acid stimulation. 7. The possible significance of a reduction in receptor sensitivity on feeding behaviour and the relative roles of blood osmolality and free amino acid content are discussed. Note: Present address: Overseas Development Natural Resources Institute, College House, Wrights Lane, London VV8 5SJ.