Within-Population Variation in Demography of Taraxacum Officinale: Maintenance of Genetic Diversity
Within-Population Variation in Demography of Taraxacum Officinale: Maintenance of Genetic Diversity
复制标题
蒲公英人口学的种群内变异：遗传多样性的维持
DOI：
10.2307/2265704
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发表时间：
1996
期刊：
影响因子：
4.8
通讯作者：
H. S. Yang
中科院分区：
文献类型：
--
作者：
M. Vavrek;J. McGraw;H. S. Yang
基因型对时间环境异质性的不同反应可能有助于这些基因型在种群中的长期持续。我们测试了基因型的季节依赖的健身组件是否可以负责维持人口内的遗传多样性。在四个季节（春季-4月至7月、夏季-7月至10月、秋季-10月至1月和冬季-1月至4月）中种植蒲公英的5个基因型的克隆重复。印度植物被直接种植到自然的田野植被中。在每个季节测量每个基因型的适合度分量（建立、存活、生长、种子生产和叶面积优势）和适合度的综合度量（有限增长率）。不同的基因型对季节的反应，观察所有健身组件。尽管存在季节差异，但各季节的基因型表现是相等的。这一结果表明，时间异质性可能对群体内的遗传结构有实质性的影响。如果长期的健身值保持相似的基因型，通过时间的对比季节性表现的持久性是预期的。
Differential response of genotypes to temporal environmental heterogeneity may contribute to the long-term persistence of those genotypes within a population. We tested whether season-dependent fitness components of genotypes could be responsible for the maintenance of genetic diversity within a population. Clonal replicates of five genotypes of Taraxacum officinale were planted in each of four seasons (spring-April to July, sum- mer-July to October, autumn-October to January, and winter-January to April). Indi- viduals were planted directly into natural, field vegetation. Fitness components (establish- ment, survival, growth, seed production, and leaf area dominance) and an integrated measure of fitness (finite rate of increase) were measured for each genotype in each season. Dif- ferential genotypic responses to seasons were observed for all fitness components. Despite seasonal differences, genotypic performances summed across seasons were equivalent. This result indicates that temporal heterogeneity may have a substantial effect on within-pop- ulation genetic structure. The persistence of genotypes of contrasting seasonal performance through time is expected if long-term fitness values remain similar.