Neopolyploid species have been used as model plants to elucidate the consequences of hybridization and polyploidy. Two Drosera species, D. anglica Hudson (2n = 4x = 40) and D. rotundifolia L. (2n = 2x = 20), and the hybrid D. ×obovata Mert. et Koch (2n = 3x = 30), which results from their crossing, have been reported from Hokkaido Island, northern Japan. Recently, we discovered unexpected higher ploidy levels within the population of these Drosera from a post-mined peatland, in Sarobetsu mire of Hokkaido. The ploidy levels were determined by flow cytometry. Polyploids were tagged and monitored at the site for three years. The morphological characteristics of the neopolyploid leaves and flowers were determined and compared to D. anglica, D. rotundifolia and D. ×obovata. Seeds collected from hexaploids were incubated in a laboratory to verify their viability. Hexaploids occurred in the field over the three years of monitoring and produced a few flowers and viable seeds; however, octoploids were extinct in the second year. The leaf shape quantified by the blade length to blade width ratio showed that the ratios of hexaploids were intermediate between D. ×obovata and D. rotundifolia, suggesting that the origin of hexaploids was likely to originate from the triploid D. ×obovata. Polyploidy may occur in disturbed habitats more commonly than previously thought.

中文翻译：

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扰动环境下茅膏菜不育杂种新多倍体的形成和建立

新多倍体物种已被用作模型植物来阐明杂交和多倍体的后果。两种茅膏菜物种，D. anglica Hudson (2n = 4x = 40) 和 D. rotundifolia L. (2n = 2x = 20)，以及杂交 D. ×obovata Mert. 在日本北部的北海道岛报道了由它们交叉产生的 et Koch (2n = 3x = 30)。最近，我们在北海道 Sarobetsu 沼泽的后开采泥炭地发现这些茅膏菜种群中意外的更高倍性水平。通过流式细胞术测定倍性水平。多倍体在现场被标记和监测了三年。确定了新多倍体叶和花的形态特征，并与 D. anglica、D. rotundifolia 和 D. ×obovata 进行比较。从六倍体收集的种子在实验室中培养以验证其活力。在三年的监测中，田间出现了六倍体，并产生了一些花和有活力的种子；然而，八倍体在第二年就灭绝了。通过叶片长度与叶片宽度比量化的叶片形状表明，六倍体的比例介于 D. ×obovata 和 D. rotundifolia 之间，表明六倍体的起源可能来自三倍体 D. ×obovata。多倍体在受干扰的栖息地中可能比以前认为的更常见。通过叶片长度与叶片宽度比量化的叶片形状表明，六倍体的比例介于 D. ×obovata 和 D. rotundifolia 之间，表明六倍体的起源可能来自三倍体 D. ×obovata。多倍体在受干扰的栖息地中可能比以前认为的更常见。通过叶片长度与叶片宽度比量化的叶片形状表明，六倍体的比例介于 D. ×obovata 和 D. rotundifolia 之间，表明六倍体的起源可能来自三倍体 D. ×obovata。多倍体在受干扰的栖息地中可能比以前认为的更常见。