Intraspecific differentiation reinforced by flowering time differentiation as local adaptation caused by the genotype polymorphisms

2015 Fiscal Year Final Research Report

• Project/Area Number: 24247013
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: Kyoto University
• Principal Investigator: Setoguchi Hiroaki 京都大学, 人間・環境学研究科(研究院), 教授 (70206647)
• Co-Investigator(Kenkyū-buntansha): KAWAGUCHI Masayoshi 自然科学研究機構, 基礎生物学研究所, 教授 (30260508) ; IKEDA Hajime 岡山大学, 資源植物科学研究所, 助教 (70580405)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 成長相転換 / 花芽形成 / 種内分化 / 環境適応 / 日長 / 春化 / ミヤコグサ / ハマダイコン

Outline of Final Research Achievements

Growth stage conversion is essential event for survival success of local populations of plant species as a sessile organism. This project aimed to elucidate mechanisms of flowering time determination for abiotic environmental factors, day length and vernalization, for Lotus japonicas (Fagaceae) and wild radish (Rhaphanus sativus: Brassicaceae). For Lotus japonicas, whole genome sequences of 131 wild lines were compared and candidate genes involved in flowering time determination. Among the 375 SNPs that were differentiated between the early- and rate flowering wild lines, 22 SNPs on gene were identified. EMBRYONIC FLOWER gene 2 (EMF2) were identified as the candidate gene. In wild radish, we found clear north-south differentiation along the Japanese islands. Comparative studies their growth pattern and gene expression (FT and FLC), southern populations can convert to reproductive stage without vernalization, whereas vernalization is essential for northern populations.

Free Research Field

生物多様性・分類