A gene complex for annual habit in sugar beet (Beta vulgaris L)
A gene complex for annual habit in sugar beet (Beta vulgaris L)
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DOI：
10.1023/a:1002963506818
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发表时间：
1997-01-01
期刊：
影响因子：
1.9
通讯作者：
Shimamoto, Y
中科院分区：
文献类型：
--
作者：
Abe, J;Guan, GP;Shimamoto, Y
甜菜的一年生习性已被证明是由显性基因B控制的，该基因在长时间没有二年生品种通常必需的寒冷条件下诱导抽苔。然而，B对抽苔的诱导往往受到环境和遗传因素的双重影响。我们研究了由一年生和二年生系杂交而成的系因延迟播种而产生的抽苔抑制的遗传基础。晚抽苔的F-1植株的F-2后代在5月下旬播种时产生了意想不到的单基因遗传分离率，尽管在4月下旬播种时观察到预期的分离，但不抽苔的二年生植株数量过多。由于在人工诱导的长日照条件下，隔离是正常的，因此由于延迟播种而限制了日照，从而造成了抽苔抑制。与B近端的同工酶标记Idh1分析表明，杂合子B植株比纯合子B植株更容易因延迟种植而受到抽苔抑制。结果表明，抽苔抑制是由多个负责长日照需求的基因控制的，其中一个基因与B密切相关，并形成了一个与年有关的基因复合体。在长日照条件下，B基因单独控制这种一年生习性，而在有限日照条件下，B基因对长日照要求进行了修饰。
Annual habit in sugar beet has been shown to be controlled by a dominant gene, B, which induces bolting under long days without the cold requirement usually essential for biennial cultivars. The induction of bolting by B, however, is often influenced by both environmental and genetic factors. We studied the genetic basis for bolting suppression, caused by delayed planting, in lines derived from a cross between annual and biennial lines. The F-2 progeny of a late-bolting F-1 plant yielded an unexpected segregation ratio of annuality from monogenic inheritance when planted in late May, there being an excess of non-bolting biennials, although the expected segregation was observed in the late April sowing. Bolting suppression was caused by restricted daylengths due to delayed planting because the segregation was normal under artificially induced long days. The analysis with Idh1, an isozyme marker proximal to B, demonstrated that heterozygous B plants were more susceptible to bolting suppression due to delayed planting than homozygous B plants. The results suggest that bolting suppression was controlled by a number of genes responsible for long daylength requirement, one of which was closely linked to B and formed a gene complex for annuality. The annual habit was controlled singly by B under long days but modified by the genes for long daylength requirement under restricted daylengths.