PARENTAL EFFECTS IN LYCHNIS-FLOS-CUCULI .2. SELECTION ON TIME OF EMERGENCE AND SEEDLING PERFORMANCE IN THE FIELD
PARENTAL EFFECTS IN LYCHNIS-FLOS-CUCULI .2. SELECTION ON TIME OF EMERGENCE AND SEEDLING PERFORMANCE IN THE FIELD
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DOI：
10.1046/j.1420-9101.1991.4030467.x
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发表时间：
1991-01-01
影响因子：
2.1
通讯作者：
BIERE, A
中科院分区：
文献类型：
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作者：
BIERE, A
以多年生牧草剪秋罗（Lychnis flos-cuculi）为材料，研究了其实验种群出苗时间的选择。 从田间群体中获得的8个基因型的全异交种子沿着包括亲本地点的环境梯度播种，发现了显著的早出苗定向选择，并且选择强度在地点之间存在差异。 不同母本和父本基因型子代家系的羽化时间差异显著。 这些差异可以归因于父母的影响，而狭义遗传力接近于零。 到秋天的存活率在父系家庭的后代中有所不同。 不同地点的母系后代的存活率各不相同。 不同出苗群体的个体间存活率和植株大小的差异在整个冬季持续存在，而不同亲本基因型的后代间这些差异的显著性则消失了，这表明出苗时间对选择的反应可能较低，因为（1）狭义遗传力较低，（2）亲本基因型对后代羽化时间的影响不同，（3）存活率存在家系×地点互作。 家庭相对较早出现的幼苗也有显着较高的种子重量，出苗率，植株重量，虽然这些家庭的相关性的强度各不相同的网站。 因此，不太可能同时选择出苗时间和这些性状中的任何一个将延迟选择出苗时间的反应。
Selection on the timing of seedling emergence was investigated in an experimental population of Lychnis flos-cuculi, a perennial hay-meadow species. Seeds obtained from a full diallel cross of 8 genotypes from a field population were sown along an environment gradient that included the parental site.Significant directional selection for early emergence was found and the intensity of selection varied among sites. Emergence time varied significantly among progeny families of different maternal and paternal genotypes. These differences could be attributed to parental effects whereas narrow-sense heritabilities were close to zero. Survivorship until autumn differed among progeny of paternal families. Survivorship of maternal progeny varied among sites. Whereas differences in survival and plant size among individuals from different emergence cohorts persisted over the winter, the significance of these differences among progeny from different parental genotypes disappeared.It is suggested that a response to selection on emergence time might be low since (1) the narrow sense heritability was low, (2) parental genotypes differed in their effect on offspring emergence time when used as female parent or as pollen donor and (3) there was a family x site interaction for survival. Families with relatively early emerging seedlings also had a significantly higher seed weight, emergence percentage, and plant weight although the strength of these among-family correlations varied among sites. It is therefore not likely that simultaneous selection on emergence time and either of these traits would retard a response to selection on emergence time.