Research on causal genes of hybrid lethality, and on a phenomenon where viable hybrids are frequently observed in lethal interspecific crosses in Nicotiana

2015 Fiscal Year Final Research Report

• Project/Area Number: 25870627
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Biodiversity/Systematics; Science in genetics and breeding
• Research Institution: Osaka Prefecture University
• Principal Investigator: TEZUKA Takahiro 大阪府立大学, 生命環境科学研究科(系), 講師 (20508808)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 雑種致死 / 生殖隔離 / 遠縁交雑育種 / 連鎖解析 / 不完全浸透 / タバコ属植物

Outline of Final Research Achievements

Inviability of hybrids, often referred to as hybrid lethality, is frequently observed in crosses between normal parental plants. Hybrid lethality can be an obstacle to the introduction of desirable genes into cultivated species by wide hybridization. In the present study, using F2 population, we mapped a causal gene of hybrid lethality, HLA1, in Nicotiana. We also revealed that lethal phenotypes and the mechanisms were different among crosses between six accessions of N. occidentalis and N. tabacum. Furthermore, we also analyzed a phenomenon where viable hybrids are frequently observed in lethal crosses.

Free Research Field

植物育種学、生物多様性・分類（種分化）