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首页> 外文期刊>Postharvest Biology and Technology >Molecular and physiological insights into the potential efficacy of CO2-augmented postharvest cold treatments for false codling moth
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Molecular and physiological insights into the potential efficacy of CO2-augmented postharvest cold treatments for false codling moth

机译：分子与生理见解患CO2 - 增强的采后冷理治疗假密码蛾的潜在疗效

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Cold sterilisation may be supplemented with elevated CO2 (hypercapnia) to increase pest mortality however, in some cases, such treatment combinations have generated unexpected high levels of pest survival. Consequently, determining the mechanistic basis of potential interactions or any cross resistance between CO2 and low temperature stress is critical for effective pest disinfestation through cold sterilization. Here, using larvae of false codling moth Thaumatotibia leucotreta, a crop pest in southern Africa, we explored the effects of various hypercapnic pre-treatments on larval survival to standard cold exposures, and a diverse array of biochemical traits that may be indicative of key cellular stress responses or damage and repair processes. Short ( 4 h) pre-treatments with a single stressor (cold or hypercapnia), multiple stress combinations (hypercapnia with hypoxia, and cold hypercapnia), followed by 10 h cold exposure had little effect on larval survival ( > 96%). Longer 24 h pre-treatments (hypercapnia + cold) followed by 5 d cold exposure led to significant differences in larval survival (0-80%), with the recovery conditions between exposures greatly affecting larval survival. In contrast with the short-term cold exposures, larvae from the long-term experiments had increased haemocyte mortality, protein concentration and heat shock protein 70 levels, while the concentrations of key cryoprotective sugars were decreased. No changes in membrane lipids could be attributed to the presence of CO2. These molecular correlates can be used as testable hypotheses for future work to further identify the mode of action of CO2 reducing (or enhancing) cold tolerance in these insects. From an insect physiology standpoint, chronic hypercapnic cold sterilization protocols appear to be a viable post-harvest option for control of T. leucotreta.
机译：冷灭菌可以补充升高的CO 2（Hypercapnia）以增加害虫死亡率，然而，在某些情况下，这种治疗组合产生了意外的高水平的害虫存活。因此，确定电位相互作用的机械基础或CO 2之间的任何横抗性，对于通过冷灭菌的有效害虫灭菌至关重要。在这里，使用南部非洲的农作物害虫幼虫的幼虫，我们探讨了各种超型预治疗对标准冷露的幼虫生存的影响，以及多样化的生物化学特性，可以指示关键细胞压力响应或损坏和修复过程。短（＆ 4 h）预处理，具有单一的压力源（寒冷或寒冷或高血管），多重应激组合（Hypoxia和缺氧和冷Hypercapnia），其次是10小时冷水对幼虫存活影响（> 96％）几乎没有影响。更长的24小时预治疗（Hypercapnia + Cold），然后是5 d冷淡导致幼虫存活率的显着差异（0-80％），曝光之间的恢复条件大大影响幼虫存活。与短期冷曝光相比，来自长期实验的幼虫增加了血液细胞死亡率，蛋白质浓度和热休克蛋白70水平，而关键冷冻保护糖的浓度降低。膜脂质的变化可能归因于CO2的存在。这些分子相关可以用作未来工作的可测试假设，以进一步识别在这些昆虫中的CO 2的作用方式（或增强）耐寒性的作用。从昆虫生理学的角度来看，慢性高型冷灭菌方案似乎是用于控制leucotreeta的可行的收获后选择。

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