Phylogeographical studies of the genus Carex based on DNA sequences

黄花属是维管植物中最大的属之一，在日本有200多种。苔草具有弥散的着丝粒染色体和显著的非整倍体系列，范围从n = 6到n = 66。报道了4个非整倍体（2n= 18,20,24,26）。基于叶绿体DNA单倍型和染色体变异，研究了广布日本莎草的系统地理格局和遗传多样性。种内非整倍体的地理分布与单倍型的地理分布基本一致。对oxyandra、C. kamagariensis和C. laticeps的系统地理学研究结果表明，这些物种的遗传多样性和染色体变异可能源于第四纪气候波动影响下地理范围的收缩和扩张。

Caex L. is one of the largest genera of vascular plants and has more than 200 species in Japan. Carex has diffuse centromeric chromosomes and a remarkable aneuploid series ranging from n = 6 to n = 66. Four aneuploids (2n=18, 20, 24, 26) are reported in C. oxyandra. The phylogeographic pattern and genetic diversity of the widespread Japanese sedge were studied based on chloroplast DNA haplotypes and chromosomal variations. The geographical distribution of intraspecific aneuploids of C. oxyandra corresponded well with those of the haplotypes. The results of phylogeographical studies of C. oxyandra, C. kamagariensis, and C. laticeps suggest that the genetic diversity and chromosomal variations in these species may have originated from contractions and expansions of geographical ranges affected by Quaternary climatic oscillations.