Wendel J F, Parks C R
Biochem Genet. 1984 Aug;22(7-8):739-48. doi: 10.1007/BF00485857.
Alcohol dehydrogenase isozymes in Camellia japonica are encoded by two genes, Adh-1 and Adh-2. Both loci are expressed in seeds, and their products randomly associate into intragenic and intergenic dimers. Electrophoresis of leaf extracts reveals only the products of Adh-2. Formal genetic analysis indicated that the two Adh loci are tightly linked (combined estimate of r = 0.004). Most segregations fit expected Mendelian ratios, but in some families distorted segregation was observed at Adh-1, Adh-2, or both loci. The deficient progeny class varied across families, and in two apparent back-crosses three rather than two phenotypic classes were recovered. The mechanism underlying these distortions is not known, but evidence is presented that suggests that the phenomenon is genic or segmental in nature. Plausible hypotheses include linkage of the Adh structural genes with a gametophytic self-incompatibility locus, translocation heterozygosity involving the segment bearing Adh-1 and Adh-2, or a combination of these two mechanisms.
山茶花中的乙醇脱氢酶同工酶由两个基因Adh - 1和Adh - 2编码。这两个基因座在种子中均有表达，它们的产物随机结合形成基因内和基因间二聚体。叶片提取物的电泳结果仅显示Adh - 2的产物。正式的遗传分析表明，这两个Adh基因座紧密连锁（重组率r的综合估计值为0.004）。大多数分离符合预期的孟德尔比例，但在一些家系中，在Adh - 1、Adh - 2或两个基因座处观察到分离扭曲现象。缺失的后代类别因家系而异，在两个明显的回交中，回收了三个而非两个表型类别。这些分离扭曲现象背后的机制尚不清楚，但有证据表明该现象本质上是基因性或片段性的。合理的假说是Adh结构基因与配子体自交不亲和基因座连锁、涉及携带Adh - 1和Adh - 2片段的易位杂合性，或这两种机制的组合。
