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首页> 外文期刊>Plant Cell Reports >Comparative assessment of genetic and epigenetic variation among regenerants of potato (Solanum tuberosum) derived from long-term nodal tissue-culture and cell selection
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Comparative assessment of genetic and epigenetic variation among regenerants of potato (Solanum tuberosum) derived from long-term nodal tissue-culture and cell selection

机译:长期节点组织培养和细胞选择衍生的马铃薯(Solanum tuberosum)再生体之间遗传和表观遗传变异的比较评估

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摘要

Three long-term nodal tissued cultured Russet Burbank potato clones and nine thaxtomin A-treated regenerant lines, derived from the nodal lines, were assessed for genetic and epigenetic (in the form of DNA methylation) differences by AFLP and MSAP. The treated regenerant lines were originally selected for superior resistance to common scab disease and acceptable tuber yield in pot and field trials. The long-term, tissue culture clone lines exhibited genetic (8.75–15.63% polymorphisms) and epigenetic (12.56–26.13% polymorphisms) differences between them and may represent a stress response induced by normal plant growth disruption. The thaxtomin A-treated regenerant lines exhibited much higher significant (p < 0.05) genetic (2–29.38%) and epigenetic (45.22–51.76%) polymorphisms than the nodal cultured parent clones. Methylation-sensitive mutations accumulated within the regenerant lines are significantly correlated (p < 0.05) to disease resistance. However, linking phenotypic differences that could be of benefit to potato growers, to single gene sequence polymorphisms in a tetraploid plant such as the potato would be extremely difficult since it is assumed many desirable traits are under polygenic control.
机译:通过AFLP和MSAP评估了三个长期结点组织培养的Russet Burbank马铃薯克隆和九个从该结点系衍生的经thaxtomin A处理的再生系,评估了遗传和表观遗传(以DNA甲基化的形式)差异。在盆栽和田间试验中,最初选择处理后的再生系是为了更好地抵抗常见的ab疮病和可接受的块茎产量。它们之间的长期组织培养克隆系表现出遗传上的差异(8.75–15.63%多态性)和表观遗传上的差异(12.56–26.13%多态性),可能代表了正常植物生长中断引起的胁迫反应。与节点培养的亲本克隆相比,用thaxtomin A处理的再生系表现出更高的显着(p <0.05)遗传(2–29.38%)和表观遗传(45.22–51.76%)多态性。再生系中积累的甲基化敏感突变与抗病性显着相关(p <0.05)。然而,将可能有益于马铃薯种植者的表型差异与诸如马铃薯的四倍体植物中的单基因序列多态性联系起来将是非常困难的,因为假定许多合乎需要的性状都处于多基因控制之下。

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