外来入侵植物和本地植物核DNA C-值的比较及其与入侵性的关系

用流式细胞仪测定了8科10属13种外来入侵植物、6种本地植物和1种外来非入侵植物的核DNAC-值。结果表明:作为整体,外来入侵植物的平均核DNAC-值显著低于本地种和外来非入侵种,但对同属不同类型植物进行比较,未发现一致的规律;在4个既包含外来入侵种又包含本地种的属中,泽兰属(Eupatorium)和鬼针草属(Bidens)外来入侵种的核DNAC-值显著低于同属本地种,莲子草属(Alternanthera)的2种外来入侵植物中仅有1个种的核DNAC-值显著低于同属本地种,而草胡椒属(Peperomia)外来入侵种的核DNAC-值显著高于同属本地种;表明核DNAC-值与外来植物入侵性无必然联系。

Nuclear DNA C-value of alien invasive and native plants and its relationship with invasiveness

The nuclear DNA C-values of 13 alien invasive, 6 native and 1 alien non-invasive plant species from 10 genera of 8 families were measured with flow cytometer. The mean nuclear DNA C-value of the 13 alien invasive species was significantly lower than those of the native and alien non-invasive species, but no consistent regularity was found for the different species of same genus. In the four genera including both alien invasive and native species, all the alien invasive species in Eupatorium and Bidens and one of the two alien invasive species in Alternanthera had significantly lower nuclear DNA C-values than their native congeners, while the alien invasive species in Peperomia had significantly higher nuclear DNA C-values than the native species. There was no certain correlation between nuclear DNA C-value and alien plant invasiveness.