Genetic variation of morphological traits in Drosophila melanogaster under poor nutrition:: isofemale lines and offspring-parent regression
Genetic variation of morphological traits in Drosophila melanogaster under poor nutrition:: isofemale lines and offspring-parent regression
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DOI：
10.1046/j.1365-2540.2001.00837.x
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发表时间：
2001-03-01
期刊：
影响因子：
3.8
通讯作者：
Imasheva, AG
中科院分区：
文献类型：
--
作者：
Bubliy, OA;Loeschcke, V;Imasheva, AG
用等雌系分析和子代-亲代回归分析方法，研究了在低酵母含量和标准培养基上饲养的黑腹果蝇的胸长、翼长和胸膜硬毛数三个形态性状的变异。其目的是测试当比较压力和非压力环境时，这些实验方法是否给出了不同的遗传变异性估计模式。在标准营养条件和较差营养条件下，等雌系设计的遗传力以及遗传和表型方差通常高于子代-亲本回归设计。对于每个性状，两种设计的遗传力对压力的反应是相似的：在营养不良的情况下，翅长表现出较低的遗传力，而胸长和胸膜毛数的遗传力在不同营养条件下没有差异。应激和非应激环境间的遗传方差和环境方差仅在等雌系中存在显著差异：营养不良时，胸长的遗传方差和胸长、翼长的环境方差较高。将结果与文献数据进行了比较，并对等雌系遗传变异性增加的可能原因进行了简要讨论。
Variation of three morphological traits (thorax length, wing length and sternopleural bristle number) was examined in Drosophila melanogaster reared on a medium with low yeast content and on a standard medium using the isofemale line analysis and offspring-parent regression. The aim was to test whether these experimental approaches give different patterns of changes in genetic variability estimates when stressful and nonstressful environments are compared. Heritabilities and genetic and phenotypic variances were generally higher in the isofemale line design than in the offspring-parent regression design under both standard and poor nutritional conditions. For each trait, the response of heritability to stress was similar in both designs: wing length exhibited lower heritability under poor nutrition, whereas heritabilities of thorax length and sternopleural bristle number did not differ between nutritional regimes. Statistically significant differences in the genetic variances and the environmental variances between stressful and nonstressful environments were recorded only in isofemale lines: the genetic variance of thorax length and the environmental variances of thorax length and wing length were higher under poor nutrition. The results are compared to literature data and possible reasons of increased genetic variability estimates in isofemale lines are briefly discussed.