HERITABILITY AND GENETIC CORRELATION OF COROLLA SHAPE AND SIZE IN ERYSIMUM MEDIOHISPANICUM
HERITABILITY AND GENETIC CORRELATION OF COROLLA SHAPE AND SIZE IN ERYSIMUM MEDIOHISPANICUM
复制标题
DOI：
10.1111/j.1558-5646.2009.00667.x
复制
发表时间：
2009-07-01
期刊：
影响因子：
3.3
通讯作者：
Perfectti, Francisco
中科院分区：
文献类型：
--
作者：
Gomez, Jose M.;Abdelaziz, Mohamed;Perfectti, Francisco
花的形状在大多数植物中已经进化为传粉媒介选择的结果。不幸的是，没有研究探索花形的遗传变异，尽管这些信息对于理解其适应性进化至关重要。我们的主要目的是确定花冠形状的遗传力在糖芥（菊科）。此外，我们还探讨了其他授粉选择性状在这种植物物种，如植物的大小，花的显示，和花冠的大小的遗传力。此外，我们调查所有这些性状之间的遗传相关性。我们发现显着的遗传力为一株大小性状（茎高），花数，所有花冠大小性状（花冠直径，花冠筒长度和花冠筒宽度），和花冠形状。因此，该物种保留了很高的能力，以应对其传粉者施加的选择。所有功能相关性状之间的遗传相关性很强，花数和植物大小之间，弱花冠大小和植物大小之间，花冠形状和任何其他性状之间没有相关性。因此，选择影响一些E。中穗草性状也会间接影响其他功能相关和不相关的性状。更重要的是，观察到的遗传相关性似乎至少部分是适应性的，因为正相关选择目前作用于这些性状之间的协方差（Gomez 2003; Gomez et al. 2006）。
Flower shape has evolved in most plants as a consequence of pollinator-mediated selection. Unfortunately, no study has explored the genetic variation of flower shape, despite that this information is crucial to understand its adaptive evolution. Our main goal here is to determine heritability of corolla shape in Erysimum mediohispanicum ( Brassicaceae). Also, we explore heritability of other pollinator-selected traits in this plant species, such as plant size, flower display, and corolla size. In addition, we investigate genetic correlations between all these traits. We found significant heritability for one plant-size trait (stalk height), for number of flowers, for all corolla-size traits (corolla diameter, corolla tube length and corolla tube width), and for corolla shape. Consequently, this species retains a high ability to respond to the selection exerted by its pollinators. Genetic correlation was strong between all functionally related traits and between flower number and plant size, weak between corolla size and plant size and no correlation between corolla shape and any other trait. Thus, selection affecting some E. mediohispanicum traits would also indirectly affect other functionally related and unrelated traits. More importantly, the observed genetic correlation seems to be at least partially adaptive because positive correlational selection currently acts on the covariance between some of these traits (Gomez 2003; Gomez et al. 2006).