Phylogenetic and comparative morphological studies on bryophytes

从系统发育和比较形态学的角度对不同苔藓植物类群进行了系统发育研究。特别注意的是地茅属，并研究了细胞核和质体在细胞分裂过程中的行为。结果表明，该属在系统发育上处于连接单细胞分裂的分类类群（包括肝科的大部分成员）和多细胞分裂的分类类群（包括蕨科的Musci、Anthocerotae和Lycopsida）的位置。Mizutania属是本研究的目标分类群之一，目前被置于Riccardia属中。结果表明，该属被置于Jungermanniales Calypogeiaceae Calypogeia属的最接近位置，而不是位于最初被描述的Metzgeriales的Metzgeriaceae的附近或中。对藓属进行了组织化学研究，确定了藓属的分类位置，并将其归属于藓科、藓科和Erpodiaceae。结果表明，该属不属于鼠足科，而属于鼠足科（或鼠足科）。研究已扩展到与苔藓植物系统发育有关的许多其他零碎研究，包括苔藓植物中SOD（超氧化物歧化酶）的分布，精子发生，物种形成，苔藓属兄弟及其相关属的分子系统发育位置，精子发生。在对该植物的精子发生过程中质体和cpDNA行为的研究中，我们得到了双亲本遗传负可能性的结果。

Phylogenetic studies have been carried out from phylogenetic and comparative morphological view points for various bryophyte groups. Special attention has paid to the liverwort genus Dumortiera and the behavior of nuclei and plastids have been investigated during cell division. The results suggested that the genus be placed at the phylogenetic position connecting the taxonomic groups (incl. most members of Hepaticae) with monoplastidic cell division and those (incl. Musci, Anthocerotae and Lycopsida of fern allies) with polyplastidic cell division. The genus Mizutania is one of target taxonomic group for the present research, which is currently placed in the genus Riccardia The results showed the genus was placed at the position closest to the genus Calypogeia of the family Calypogeiaceae, Jungermanniales, not placed near or in the family Metzgeriaceae of the Metzgeriales where the genus has originally been described.The moss genus Ptychomitrium was histochemically investigated to obtain more information on its taxonomic position, which has been placed in the families Grimmiaceae, Ptychomitriaceae, or Erpodiaceae. The results indicated that the genus is never placed in Erpodiaceae, but in Grimmiaceae (or Ptychomitriaceae).Research has been extended to many other fragmental investigations relevant to bryophyte phylogeny, including distribution of SOD(Superoxide Dismutase) among bryophytes, spermatogensis, speciation, molecular phylogenetic position on the moss genus Brotherella and its related genera, spermiogenesis. In the study on the behavior of plastids and cpDNA in the spermiogenesis in Dumortiera, we obtained the result showing the negative posibility of biparental inheritance for this liverwort.