Phylogenetic and comparative morphological studies on bryophytes

从系统发育和比较形态的角度对不同的苔藓植物类群进行了系统发育研究。人们特别关注地钱属植物，并研究了细胞核和叶绿体在细胞分裂过程中的行为。结果表明，该属在系统发育中处于联系分类群的位置(包括。大多数肝科成员)具有单质体细胞分裂和那些(包括蕨类植物的苔藓属(Musci)、花珊瑚属(Anthocerotae)和石松属(Lycopsida))具有多质体细胞分裂。Mizutania属是本次研究的目标分类类群之一，目前被归入Riccardia属。结果表明，该属被置于与Calypogeiaceae，Jungermanniales科的Calypogeia属最近的位置，而不是在该属最初被描述的Metzgeriaceae的Mezgeriaceae的附近或之内。结果表明，该属从未被归入猴头藻科，而是归入石龙科(或石龙科)。研究已扩展到许多与苔藓系统发育有关的片段性研究，包括超氧化物歧化酶在苔藓植物中的分布、精子发生、物种形成、苔藓属及其近缘属的分子系统发育地位、精子发生。在对浮游植物精子发生过程中叶绿体和cpDNA行为的研究中，我们得到的结果表明，这种苔类植物具有负双亲遗传的可能性。

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.