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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Mining de novo diversity in palaeopolyploids
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Mining de novo diversity in palaeopolyploids

机译：从古多倍体中重新挖掘多样性

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Palaeopolyploids per se are bestowed with buffering capacity to accommodate large-scale loss or gain of genetic material and they harbour de novo variations in the somatic tissues in higher order palaeopolyploids. Such de novo changes, when channelledinto differentiation of daughter shoots become an important resource and valuable means to score diversity in the species, where sexual mechanisms are deficient. Using the palaeo-octaploid plant system Mentha arvensis, we demonstrate that somatic diversity accumulated de novo in asexually reproducing plants is elicited by polyplo-idization stress, unravelling the mine of hidden varia-tion. This facilitates fixation of new genomic states in a short time, through their participation in bud-sport formation, that otherwise happens over the evolutionary timescale. The observations made have far-reaching practical implications, suggesting a simple means to realize a plethora of functionally balanced genetic variations at whole-plant level in evolutionary hybridsatural polyploidsew polyploid lineages, without any involvement of the sexual process or other cumber-some means of induction of clonal variation that carries a risk of genotypic or aneuploid syndrome. The occurrence and impact of such processesin the evolution of natural hybrids is unknown, but it is believed that this may have contributed to the success and diversification of polyploid lineages.
机译：古多倍体本身具有缓冲能力，以适应遗传物质的大规模损失或获取，并且它们在较高阶的古多倍体的体细胞组织中具有从头变异。当从头分化为子枝时，这种从头开始的变化就成为一种重要的资源和宝贵的手段，可以为缺乏性机制的物种打分。使用古八倍体植物系统薄荷树，我们证明了无性繁殖植物从头开始积累的体细胞多样性是由多重胁迫引起的，揭示了隐藏的变异矿。通过参与芽运动形成，这有助于在短时间内固定新的基因组状态，否则这些新的基因组状态会在进化的时间尺度上发生。所观察到的结果具有深远的实际意义，表明一种简单的方法即可在进化杂种/天然多倍体/新多倍体谱系中在全植物水平上实现多种功能平衡的遗传变异，而无需涉及性过程或其他繁琐的工作。引起基因变异或非整倍性综合征风险的一些克隆变异诱导方法。在天然杂种的进化中这种过程的发生和影响尚不清楚，但是据信这可能有助于多倍体谱系的成功和多样化。

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