In the invading course of Undaria pinnatifida, zoospore attachment in a dynamically changed subtidal water environment is crucial for the establishment of a potential population in alien waters. Among many abiotic fac...In the invading course of Undaria pinnatifida, zoospore attachment in a dynamically changed subtidal water environment is crucial for the establishment of a potential population in alien waters. Among many abiotic factors that may interfere with the attachment process, water velocity is the most important one. In this investigation, the effect of water velocity on zoospore attachment of U. pinnatifida was investigated in an artificially designed system. It was found that freshly released zoospores that were transported by water flowing at 0 -16 cm/s showed no difficulty in attaching the smooth surface. Zoospore attachment decreased at elevated water flowing rates. At 70 cm/s no spore attachment occurred. Spores that have settled on glass slide for up to 1 h could not be stripped away by flowing water at a rate of 129 cm/s, the same was true of the 20 d old filamentous gametophytes. It was found that more than 70% of free-swimming zoospores tended to settle down adjacent to the settled spores and formed conjugated clusters from two up to a few hundred cells in still culture.展开更多
Based on the observation and comparative analysis,overall and systematic development of M.latissimum in the stages from conjugation of gamete to discharge of zoospore,on the sporophyte stage during the life history of...Based on the observation and comparative analysis,overall and systematic development of M.latissimum in the stages from conjugation of gamete to discharge of zoospore,on the sporophyte stage during the life history of M.latissimum is entirely expatiated in this article.Meanwhile,on the basis of the results of the experiment,we divided the sporophyte stage of M.latissimum into five periods : conjugation of gametes(gamete 7.5 μm×2.0 μm),zygocyte(4-20 μm),sporange(18-40 μm),zoospore formation(sporange 35-55 μm) and discharge of zoospore(zoospore 9.4 μm×3 μm).In this paper it may be in China to find the systemic acknowledgement on the division of the sporange stage during the life history of Monostroma as well as to the seedling cultivation in practice.展开更多
基金The"863"Hi-Tech Research and Development Program of China under contract No. 2006AA10A412 a project from the Chinese Academy of Sciences under contract No.KSCX2-YW-N-47-07
文摘In the invading course of Undaria pinnatifida, zoospore attachment in a dynamically changed subtidal water environment is crucial for the establishment of a potential population in alien waters. Among many abiotic factors that may interfere with the attachment process, water velocity is the most important one. In this investigation, the effect of water velocity on zoospore attachment of U. pinnatifida was investigated in an artificially designed system. It was found that freshly released zoospores that were transported by water flowing at 0 -16 cm/s showed no difficulty in attaching the smooth surface. Zoospore attachment decreased at elevated water flowing rates. At 70 cm/s no spore attachment occurred. Spores that have settled on glass slide for up to 1 h could not be stripped away by flowing water at a rate of 129 cm/s, the same was true of the 20 d old filamentous gametophytes. It was found that more than 70% of free-swimming zoospores tended to settle down adjacent to the settled spores and formed conjugated clusters from two up to a few hundred cells in still culture.
文摘Based on the observation and comparative analysis,overall and systematic development of M.latissimum in the stages from conjugation of gamete to discharge of zoospore,on the sporophyte stage during the life history of M.latissimum is entirely expatiated in this article.Meanwhile,on the basis of the results of the experiment,we divided the sporophyte stage of M.latissimum into five periods : conjugation of gametes(gamete 7.5 μm×2.0 μm),zygocyte(4-20 μm),sporange(18-40 μm),zoospore formation(sporange 35-55 μm) and discharge of zoospore(zoospore 9.4 μm×3 μm).In this paper it may be in China to find the systemic acknowledgement on the division of the sporange stage during the life history of Monostroma as well as to the seedling cultivation in practice.
