Taxonomy and molecular evolution for environmental adaptation contributed to speciation of green algal genus Ulva

2014 Fiscal Year Final Research Report

• Project/Area Number: 22570086
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: Ochanomizu University
• Principal Investigator: SHIMADA SATOSHI お茶の水女子大学, 大学院人間文化創成科学研究科, 准教授 (40322854)
• Co-Investigator(Renkei-kenkyūsha): MIYAMOTO Shinichi 筑波大学, 大学院生命環境科学領域, 准教授 (00192766)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 緑藻類 / アオサ類 / 種多様性 / 環境適応 / 分子進化 / 新種記載 / nrITS / rbcL

Outline of Final Research Achievements

This study focused on the taxonomy and molecular evolution for environmental adaptation contributed to speciation of green algal genus Ulva. Ulva meridionalis Horimoto et Shimada sp. nov. was described from the Todoroki River, Okinawa Prefecture. Ulva adhaerens Matsumoto et Shimada sp. nov. was described from the samples resembling U. conglobate. Ulva tepida Masakiyo et Shimada sp. nov. was described from Kanto region. Ulva linza (seawater), U. prolifera (brackish water) and bloom strain (seawater) were closely related in nrITS2 analysis. After 7 days of freshwater exposure, the viability of U. linza decreased to approximately 20%, while U. prolifera showed nearly 100% viability. In order to search what genes are related to low-salinity adaptation of U. prolifera, the expressed genes of U. prolifera and U. linza cultured under seawater (SW), brackish water (BW) and freshwater (FW) conditions were compared by RNA-seq.

Free Research Field

分類学