Analysis of dominant genic male-sterile rice for realizing a recurrent selection based on the genome shuffling

2020 Fiscal Year Final Research Report

• Project/Area Number: 17H03744
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Science in genetics and breeding
• Research Institution: Tohoku University
• Principal Investigator: Toriyama Kinya 東北大学, 農学研究科, 教授 (20183882)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 育種学 / 遺伝学 / ゲノム / イネ

Outline of Final Research Achievements

Dominant male sterility is a powerful tool to apply outcross-based breeding system to autogamous crops such as rice. We previously obtained male sterile plants in an indica rice cultivar Lebed backcrossed with a japonica Taichung 65 (T65) and found the heterozygous Lebed allele of the male sterility gene, named LEBED-TAICHUNG 65 MALE STERILITY (LTMS), acts as dominant sporophytic pollen killer. We carried out map-based cloning of the LTMS gene and identified a candidate gene for LTMS. The LTMS gene was demonstrated to be the Lebed allele of the LTMS acting as dominant male sterility allale in a nuclear background of japonica rice, thus would be useful for recurrent selection breeding of japonica rice.

Free Research Field

植物分子遺伝育種学

Academic Significance and Societal Importance of the Research Achievements

本研究をイネの品種改良に応用すると、自殖性作物のイネを効率的に他殖させ、ゲノムシャッフリングを行うことができる。トウモロコシなどの多殖性作物の育種法である循環選抜育種をジャポニカイネに応用できることになり、遺伝的多様性の大きい様々な優れたイネの品種改良を行うことが可能となる。