Energy use efficiency is characterized by an epigenetic component that can be directed through artificial selection to increase yield
Energy use efficiency is characterized by an epigenetic component that can be directed through artificial selection to increase yield
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DOI：
10.1073/pnas.0908755106
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发表时间：
2009-11-24
影响因子：
11.1
通讯作者：
De Block, Marc
中科院分区：
文献类型：
--
作者：
Hauben, Miriam;Haesendonckx, Boris;De Block, Marc
数量性状，如动物的大小和重量以及植物的种子产量，即使在遗传相同的个体群体中也是正态分布的。例如，在植物中，各种因素，如当地的土壤质量，小气候和播种深度，影响同基因种群的个体植物之间的生长差异。除了这些物理因素外，表观遗传成分也有助于生长和产量的差异。调节作物产量的网络仍然没有得到很好的理解。虽然这个网络预计有表观遗传因素，但目前完全不清楚是否有可能塑造表观基因组以增加作物产量。在这里，我们表明，能量利用效率是一个重要的因素，在决定油菜（甘蓝型油菜）种子产量，它可以通过人工选择表观遗传特征。从一个同基因油菜群体的单株及其自交后代的呼吸强度进行递归选择，可以产生具有不同的生理和农艺性状的群体。这些人群被发现在遗传上是相同的，但表观遗传上不同。此外，无论是DNA甲基化模式，以及农艺和生理特性的选择线是可遗传的。从选择高能量利用效率的亲本系衍生的杂交种在杂种优势之上具有5%的产量增加。我们的研究结果表明，人工选择允许通过选择具有特定表观基因组状态的群体来增加产量潜力。
Quantitative traits, such as size and weight in animals and seed yield in plants, are distributed normally, even within a population of genetically identical individuals. For example, in plants, various factors, such as local soil quality, microclimate, and sowing depth, affect growth differences among individual plants of isogenic populations. Besides these physical factors, also epigenetic components contribute to differences in growth and yield. The network that regulates crop yield is still not well understood. Although this network is expected to have epigenetic elements, it is completely unclear whether it would be possible to shape the epigenome to increase crop yield. Here we show that energy use efficiency is an important factor in determining seed yield in canola (Brassica napus) and that it can be selected artificially through an epigenetic feature. From an isogenic canola population of which the individual plants and their self-fertilized progenies were recursively selected for respiration intensity, populations with distinct physiological and agronomical characteristics could be generated. These populations were found to be genetically identical, but epigenetically different. Furthermore, both the DNA methylation patterns as well as the agronomical and physiological characteristics of the selected lines were heritable. Hybrids derived from parent lines selected for high energy use efficiencies had a 5% yield increase on top of heterosis. Our results demonstrate that artificial selection allows the increase of the yield potential by selecting populations with particular epigenomic states.