Cucurbita pepo contains a wealth of genetic variability in fruit size, shape, and color. A common fruit color pattern in C. pepo is striping of the fruits. Stripes occur on the fruit exterior in accordance with the positions of the 10 main subepidermal vein tracts, and can be normal, with darker stripes occurring between and lighter stripes over and adjacent to the vein tracts, or reversed, with lighter stripes occurring between and darker stripes over and adjacent to the vein tracts. Reverse striping has been reported as being independent and at other times dependent on the presence of the dominant allele for dark stem color, D. The objective of this investigation was to determine the relationship, if any, between the two types of reverse striping, dark-stem-dependent and independent. For this purpose, two accessions, which when crossed produced progeny having dark-stem-dependent reverse striping, were crossed with seven near-isogenic tester accessions of known genotype. The results indicated that the two types of reverse striping are conferred by different alleles at the same locus, which is also the same locus at which other alleles confer normal striping. The results of crossing among the nine accessions suggest that two genes reported as having major effects on fruit color, l-2 and W, are actually the same locus (or two tightly linked loci). To minimize possible confusion, it is suggested that this multiple-allelic locus be hereafter referred to as l-2. This locus has seven alleles, of which the two top dominants, L-2WS and L-2W, and the bottom recessive, l-2, confer the exact same fruit phenotype, weak coloration. Two intermediate alleles, L-2 and L-2i, result in intense fruit coloration and normal striping, and two other intermediate alleles, L-2Wr and l-2R, respectively, confer dark-stem-dependent and independent reverse striping. The order of dominance of the seven alleles is L-2WS > L-2W > L-2Wr > L-2 > L-2i > l-2R > l-2.

中文翻译：

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Cucurbita pepo（南瓜、南瓜、葫芦：Cucurbitaceae）中的暗茎依赖性反向果实条纹：基因 l-2 和 W 位于同一位点

Cucurbita pepo 在果实大小、形状和颜色方面具有丰富的遗传变异性。C. pepo 中常见的水果颜色图案是水果的条纹。根据10条主要表皮下静脉束的位置，果实外表出现条纹，可以是正常的，在静脉束之间出现较深的条纹，在静脉束上方和相邻处出现较浅的条纹，或者相反，在静脉束之间出现较浅的条纹和较暗的条纹静脉束上方和附近的条纹。据报道，反向条纹是独立的，有时取决于深色茎颜色 D 的显性等位基因的存在。本研究的目的是确定两种类型的反向条纹之间的关系，如果有的话，深色-茎依赖和独立。为此，两份加入，当杂交产生具有暗茎依赖性反向条纹的后代时，将其与七个已知基因型的近等基因测试种质杂交。结果表明，两种类型的反向条纹是由同一位点的不同等位基因赋予的，这也是其他等位基因赋予正常条纹的相同位点。九个种质之间的杂交结果表明，据报道对果实颜色有主要影响的两个基因 l-2 和 W 实际上是相同的基因座（或两个紧密连锁的基因座）。为了尽量减少可能的混淆，建议此多等位基因位点在下文中称为 l-2。该基因座有七个等位基因，其中两个顶部显性基因 L-2WS 和 L-2W 和底部隐性基因 l-2 赋予完全相同的果实表型，颜色较弱。两个中间等位基因，L-2 和 L-2i，导致强烈的果实着色和正常条纹，另外两个中间等位基因 L-2Wr 和 l-2R 分别赋予暗茎依赖性和独立的反向条纹。七个等位基因的优势顺序为 L-2WS > L-2W > L-2Wr > L-2 > L-2i > l-2R > l-2。