Maternal age affects offspring lifespan of the seed beetle, Callosobruchus maculatus
Maternal age affects offspring lifespan of the seed beetle, Callosobruchus maculatus
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DOI：
10.1111/j.1365-2435.2003.00799.x
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发表时间：
2003-12-01
影响因子：
5.2
通讯作者：
Wallin, WG
中科院分区：
文献类型：
--
作者：
Fox, CW;Bush, ML;Wallin, WG
1.年长父母的后代通常比年轻母亲的后代的成年寿命短。研究了种子甲虫Callosobruchus maculatus子代基因型、母本年龄和父本年龄对子代存活、发育和成虫寿命的影响.雌性从卵发育成成虫所需时间比雄性长约四分之一天，寿命比雄性长约7天。死亡率模式最好用逻辑死亡率模型描述，所有三个模型参数在性别之间差异显著;女性的基线死亡率高于男性，但女性的死亡率增加速度比男性慢。与男性相比，女性的死亡率在年龄上也有所延迟。卵孵化的比例和幼虫存活率都随着母体年龄的增加而下降，而卵至成虫的发育时间大幅增加。与在许多其他生物体中观察到的模式相反，即使在控制了家庭之间的异质性之后，年长母亲的后代也比年轻母亲的后代寿命更长。没有证据表明父亲的年龄会影响后代的任何性状。母亲年龄对后代寿命的影响男性后代大于女性后代（与一般观察结果一致，即影响寿命的遗传和环境因素在两性之间存在差异），并且在父系家庭中存在差异（表明后代基因型介导了母亲年龄对寿命的非遗传影响）。
1. Offspring from older parents often have shorter adult lifespans than offspring of younger mothers. We examine the effects of offspring genotype, maternal age and paternal age on offspring survival, development and adult lifespan in the seed beetle, Callosobruchus maculatus.2. Females took about a quarter of a day longer to develop from an egg to an adult and lived approximate to7 days longer than males. Mortality patterns were best described by a logistic mortality model, and all three model parameters differed significantly between the sexes; females had a higher baseline mortality rate than males but the mortality rate increased more slowly in females than in males. Females also showed a delay, relative to males, in the age at which mortality became age-dependent.3. The proportion of eggs that hatched and larval survivorship both declined with increasing maternal age, while egg-to-adult development time increased substantially. Contrary to the pattern observed in many other organisms, offspring of older mothers lived longer than offspring of younger mothers, even after controlling for heterogeneity among families. There was no evidence that paternal age affected any offspring traits.4. The effect of maternal age on offspring lifespan was greater for male offspring than for female offspring (consistent with the general observation that the genetic and environmental factors affecting lifespan differ between the two sexes) and varied among sire families (indicating that offspring genotype mediated the non-genetic effect of maternal age on lifespan).