Muscles provide an internal water reserve for reproduction
Muscles provide an internal water reserve for reproduction
复制标题
DOI：
10.1098/rspb.2018.0752
复制
发表时间：
2018-06-27
影响因子：
4.7
通讯作者：
DeNardo, Dale F.
中科院分区：
文献类型：
--
作者：
Brusch, George A.;Lourdais, Olivier;DeNardo, Dale F.
利用脂肪来支持生殖的能量需求（即资本育种）已经在不同的分类群中进行了研究。然而，尽管生殖产出（即幼鱼或卵）大约70%是水，但人们对内部资源的可用性知之甚少，以适应生殖的水分需求。最近的研究表明，脱水会增加肌肉的分解代谢，作为维持水分平衡的一种手段。因此，我们研究了生殖投资和缺水对雌性儿童蟒（Antaresia childreni）分解代谢和生殖输出的交互影响。有生殖能力和无生殖能力的雌性在怀孕期间要么随意喝水，要么连续三周不喝水。我们发现，与其他组相比，缺水的生殖女性总体上有更大的体重损失、外轴肌损失、血浆渗透压和血浆尿酸浓度。此外，与有水的雌虫相比，缺水雌虫的卵数相似，但产卵量更轻，总卵数更低。我们的研究结果首次证明了选择性蛋白质分解代谢可以用于支持繁殖过程中的水分需求，因此，这些发现将资本育种概念扩展到非能量资源。
The use of fat to support the energy needs of reproduction (i.e. capital breeding) has been studied in a diversity of taxa. However, despite reproductive output (i.e. young or eggs) being approximately 70% water, little is known about the availability of internal resources to accommodate the hydric demands of reproduction. Recent research suggests that dehydration increases the catabolism of muscle as a means of maintaining water balance. Accordingly, we investigated the interactive effects of reproductive investment and water deprivation on catabolism and reproductive output in female Children's pythons (Antaresia childreni). Both reproductive and nonreproductive females were either provided water ad libitum or were water-deprived for three weeks at the time when reproductive females were gravid. We found that water-deprived reproductive females had, in general, greater body mass loss, epaxial muscle loss, plasma osmolality and plasma uric acid concentrations relative to the other groups. Furthermore, water-deprived females had similar clutch sizes compared with females with access to water, but produced lighter eggs and lower total clutch masses. Our results provide the first evidence that selective protein catabolism can be used to support water demands during reproduction, and, as a result, these findings extend the capital breeding concept to non-energetic resources.