青藏高原二种车前属植物的核型和C-值报道

Karyotypes and C-values of Two Plantago Species from the Qinghai-Tibet Plateau,China

对青藏高原平车前(Plantago depressa)18个居群和大车前(Plantago major)2个居群的染色体数目、核型和C-值进行了研究。结果表明:西藏亚东县和林芝县的平车前居群染色体数目为2n=4x=24;其它平车前和大车前居群的染色体数目均为2n=2x=12;染色体基数均为x=6;核型类型均为1A型,核型组成和前人的研究结果不尽相同。平车前的2C-值为首次报道,随着倍性水平的增加1Cx-值降低。大车前的2C-值和前人的研究结果存在着差异。平车前和大车前不同居群的2C-值发生了变异。流式细胞仪不能用来估测车前属植物的倍性水平。

The chromosome numbers, karyotypes and C-values of 18 populations of Plantago depressa and 2 popula- tions of Plantago major from the Qinghai-Tibet Plateau, China, were reported in the present study. The results were as follows ： the chromosome numbers of P. depressa populations from Yadong County and Nyingchi County of Tibetan Autonomous Region （TAR） were 2n = 4x = 24, other populations of P. depressa and P. major were 2n = 2x = 12, and the basic chromosome number of all populations was x = 6. All karyotype types were 1A, and the karyotype constitu- tions were not completely consistent with previous reported results. The 2C-value of P. depressa was reported for the first time, and the 1Cx-vaule tended to decrease with increasing ploidy levels. Meanwhile, the 2C-value of P. major was not identical with previous existing results. The results showed that the variation of 2C-value occurred at the in- ter-population level of P. depressa and P. major, also flow cytometry couldn＇t be used to estimate the ploidy of the ge- nus Plantago Linn.