Reproduction deep inside wood: a low O2 and high CO2 environment promotes egg production by termite queens
Reproduction deep inside wood: a low O2 and high CO2 environment promotes egg production by termite queens
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木材深处的繁殖：低氧气和高二氧化碳环境促进白蚁蚁后产卵
DOI：
10.1098/rsbl.2020.0049
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发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Matsuura Kenji
中科院分区：
文献类型：
--
作者：
Tasaki Eisuke;Komagata Yasuyuki;Inagaki Tatsuya;Matsuura Kenji
对于生活在恶劣环境中的动物来说，极端条件是正常的。这些动物适应它们的栖息地，并可以默认使用困难的条件。生活在封闭空间中的生物，特别是腐烂木材中的白蚁，由于有限的气体交换和高昆虫密度，会经历低O2和高CO2气体条件。特别是白蚁蚁后，在树林深处的皇家房间里繁殖，成千上万的个体在那里从事社会劳动。在这里，我们表明，皇家商会在白蚁巢有低O2和高CO2气体浓度，这提高了产蛋皇后。我们确定了一个独特的皇家室在地下白蚁的巢，其特点是低O2（15.75%）和高CO2（4.99%）浓度的气体条件。皇后表现出显着更大的繁殖力下低O2和高CO2气体条件下的皇家室比环境气体条件下。定量PCR分析表明，与环境气体条件相比，皇家气室气体条件显著促进了蜂王卵黄蛋白原基因RsVg 1、RsVg 2和RsVg 3的表达水平。这项研究强调了生活在封闭栖息地的动物的适应性，这些栖息地由于自身的新陈代谢而缺氧和高碳酸血症，以便在这种环境条件下具有较高的适应性。
Extreme conditions are normal for animals living in harsh environments. These animals adapt to their habitats and can use difficult conditions by default. Organisms living in enclosed spaces, notably termites in decaying wood, experience low O2and high CO2gas conditions due to limited gas exchange and high insect density. Termite queens, in particular, reproduce in royal chambers deep inside the wood, wherein tens of thousands of individuals engage in social labour. Here, we demonstrate that royal chambers in termite nests have low O2and high CO2gas concentrations, which enhance egg production by queens. We identified a unique gas condition of royal chambers in the nest of the subterranean termiteReticulitermes speratus, which is characterized by low O2(15.75%) and high CO2(4.99%) concentrations. Queens showed significantly greater fecundity under the low O2and high CO2gas conditions in the royal chambers than under ambient gas conditions. Quantitative PCR analysis revealed that the royal chamber gas conditions significantly promoted the expression levels of the vitellogenin genesRsVg1,RsVg2andRsVg3in queens compared with ambient gas conditions. This study highlights the adaptation of animals that live in closed habitats, which are hypoxic and hypercapnic as the result of their own metabolism, so as to have a high fitness in such environmental conditions.