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A genetic and physiological analysis of late flowering mutants in Arabidopsis thaliana

热1 liuxin 添加于 2010-4-26 17:43 | 2548 次阅读 | 0 个评论

作者
Koornneef M, Hanhart CJ, Veen JH
摘要
Summary Monogenic mutants of the early ecotype Landsberg erecta were selected on the basis of late flowering under long day (LD) conditions after treatment with ethyl methanesulphonate or irradiation. In addition to later flowering the number of rosette and cauline leaves is proportionally higher in all mutants, although the correlation coefficient between the two parameters is not the same for all genotypes. Forty-two independently induced mutants were found to represent mutations at 11 loci. The mutations were either recessive, intermediate (co locus) or almost completely dominant (fwa locus). The loci are located at distinct positions on four of the five Arabidopsis chromosomes. Recombinants carrying mutations at different loci flower later than or as late as the later parental mutant. This distinction led to the assignment of eight of the loci to three epistatic groups. In wild type, vernalization promotes flowering to a small extent. For mutants at the loci fca, fve, fy and fpa, vernalization has a large effect both under LD and short day (SD) conditions, whereas co, gi, fd and fwa mutants are almost completely insensitive to this treatment. SD induces later flowering except for mutants at the co and gi loci, which flower with the same number of leaves under LD and SD conditions. This differential response of the mutants to environmental factors and their subdivision into epistatic groups is discussed in relation to a causal model for floral initiation in Arabidopsis thaliana.
详细资料
- 文献种类: Journal Article
- 期刊名称: MGG Molecular & General Genetics
- 期刊缩写: Molec. Gen. Genet.
- 期卷页: 1991年第229卷第1期
- ISBN: 0026-8925
学科领域生物医药 » 生物学
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【原创】EMS诱变产生在长日照条件下晚花的突变株，连坐叶和茎生叶比野生型多。共获得了42个突变株，属于11个基因座。双突变体比亲本开花晚或一样晚。在野生型中，春化作用可以小幅度的促进开花，但是对于得到的四种突变体，无论在长日照或短日照的条件下都能大幅度的促进开花，另外的四种突变体却不敏感，通过突变体对环境因素的不同反应，它们被细分成不同的组，与拟南芥的开花启动模型有关。

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