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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Inheritance of freezing resistance in tuber-bearing Solanum species: evidence for independent genetic control of nonacclimated freezing tolerance and cold acclimation capacity.
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Inheritance of freezing resistance in tuber-bearing Solanum species: evidence for independent genetic control of nonacclimated freezing tolerance and cold acclimation capacity.

机译：承载块茎茄属植物抗冻性的传承：非适应性抗冻性和冷适应能力的独立遗传控制证据。

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Frost or winter survival is regarded as a complex trait with polygenic inheritance. Two major components of this survival in crop plants are freezing tolerance in the nonacclimated state and cold acclimation capacity. To date researchers have not distinguished the two components as separate heritable traits. The mode of inheritance of these two traits was investigated in F1 and backcross populations of two wild diploid potato species (Solanum commersonii and Solanum cardiophyllum) exhibiting extremes of freezing tolerance and acclimation capacity. Precise assessment of these two traits allowed distinction of small but significant differences among genotypes. The two traits were not correlated in segregating populations, suggesting independent genetic control. Analyses of generation means indicate that all of the variance for acclimation capacity and a major proportion of the variance for the nonacclimated freezing tolerance can be best explained by an additive-dominance model with both traits being partially recessive. Recovery of parental phenotypes in limited populations suggests that both traits are controlled by relatively few genes. To our knowledge this is the first study demonstrating independent genetic control of the two main traits associated with frost or winter survival. Our results show that it should be possible to incorporate these traits from wild germ plasm into cultivated crop plants by independent selection. These results help explain the lack of progress in improving winter survival through field selection. Furthermore, our study demonstrates relative simplicity of the inheritance of cold acclimation, thus providing avenues for understanding the link between biochemical and genetic aspects of low-temperature stress in crop plants.
机译：霜冻或冬季生存被认为是具有多基因遗传的复杂性状。作物中这种存活的两个主要组成部分是非适应状态下的耐冻性和冷适应能力。迄今为止，研究人员尚未将这两个成分区分为单独的遗传性状。在两个野生二倍体马铃薯品种（Solanum commersonii和Solanum cardiophyllum）的F1和回交种群中研究了这两个性状的遗传模式，这些品种表现出极高的耐寒性和适应能力。对这两个特征的精确评估可以区分基因型之间的微小差异，但差异很大。这两个性状在分离的群体中不相关，表明独立的遗传控制。生成方式的分析表明，适应性能力的所有方差和非适应性抗冻性方差的主要部分都可以通过加性优势模型得到最好的解释，这两个特性都是部分隐性的。有限人群中父母表型的恢复表明这两个性状都由相对较少的基因控制。据我们所知，这是第一项证明对霜冻或冬季生存相关的两个主要性状进行独立遗传控制的研究。我们的结果表明，应有可能通过独立选择将野生种质的这些性状纳入栽培作物。这些结果有助于说明在通过田间选择提高冬季生存方面缺乏进展。此外，我们的研究表明冷驯化的遗传相对简单，从而为理解作物低温胁迫的生物化学和遗传方面之间的联系提供了途径。

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