Effect of polyploidy and hybridization on the species-specific variation in response to environmental stress in aquatic Potamogeton plants

2015 Fiscal Year Final Research Report

• Project/Area Number: 25440209
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: Kobe University
• Principal Investigator: Kosuge Keiko 神戸大学, 理学(系)研究科(研究院), 准教授 (50215266)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 異質倍数体 / 環境ストレス / 水生植物 / アブシシン酸 / 気孔 / 異形葉性

Outline of Final Research Achievements

Two aquatic Potamogeton plants, amphibious P. wrightii and obligate submerged P. perfoliatus, are closely related but ecologically diverse. By the exogenous abscisic acid (ABA) treatment, both plants produced stomatal leaves and could survive on land. However, under salinity or low temperature treatments, which promote ABA biosynthesis, stomatal leaves underwater were formed only in P. wrightii. The expression of key enzyme genes in ABA biosynthesis was consistently up-regulated in P. wrightii, but only temporarily in P. perfoliatus under salinity stress. These results suggest that the two Potamogeton species have an innate morphogenetic ability to grow on land, but the actual production of shoot with stomatal leaves depends on ABA-mediated stress responses specific to each species and habitat.

Free Research Field

植物分類・生態学