Regulatory mechanisms on phenotypic plasticity of rice root system architecture induced by cell wall dynamics

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H02174
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 39010:Science in plant genetics and breeding-related
• Research Institution: Nagoya University
• Principal Investigator: Inukai Yoshiaki 名古屋大学, 農学国際教育研究センター, 教授 (20377790)
• Co-Investigator(Kenkyū-buntansha): 兒島 孝明 名古屋大学, 生命農学研究科, 講師 (40509080)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: イネ / 突然変異体 / 側根形成 / オーキシン / 細胞壁 / 分子機構

Outline of Final Research Achievements

Since the lateral root primordium size is a major factor that determines the root system morphology and regulates the water absorption capacity under drought stress, it is extremely important for stable rice production under a poor environment to elucidate the control mechanism of the lateral root primordium size. Here, we tried to characterize some rice mutants that produce big size of lateral root primordia and isolate and analyze each mutant’s causative gene. As a result, it was clarified that changes in cell wall extensibility and auxin localization are involved in the control of lateral primordium size.

Free Research Field

植物遺伝育種学

Academic Significance and Societal Importance of the Research Achievements

近年、世界的な干ばつが頻発する中、根系改良による耐乾性育種が注目されている。本研究の成果から、イネの根系形態を可塑的に変化させる能力を強化し、乾燥ストレス耐性に優れる品種を作出する上での有用な手がかりが得られた。