Developmental instability in Brassica campestris (Cruciferae): Fluctuating asymmetry of foliar and floral traits

被引:38
作者
Evans, AS
Marshall, M
机构
[1] Department of Biology, University of New Mexico, Albuquerque
[2] Department of Botany, University of British Columbia, Vancouver
关键词
developmental instability; fluctuating asymmetry; plants; components of fitness; growth and reproduction; heritability;
D O I
10.1046/j.1420-9101.1996.9060717.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The degree of fluctuating asymmetry of bilateral traits provides a measure of developmental instability, which can be influenced by genetic as well as environmental stress. We studied genetic variation between and within two populations of the mustard Brassica campestris for asymmetry of foliar (cotyledon width) and floral (petal length and width) traits as well as for phenological (germination and flowering) and performance (biomass and flowering) traits. The two populations differed in mean expression of most traits, including asymmetry. However, within-population estimates of genetic variability tended to be lower for asymmetry than other traits. Asymmetry was greater in the population that had lower biomass accumulation and flower production, which supports the idea that population-level asymmetry may be indicative of population-level performance. However, within each population, evidence that performance was negatively correlated with asymmetry was equivocal. Within populations there was little or no concordance among estimates of asymmetry based on different structures, i.e., plants that had highly asymmetrical cotyledons did not tend to have highly asymmetrical petals. The lack of a general buffering capacity at the individual level maybe explained by developmental processes (e.g., action of different genes or morphogens) as well as evolutionary processes (e.g., selection on asymmetry of different traits).
引用
收藏
页码:717 / 736
页数:20
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