Genetical and eco-physiological study on the ability of grain protein accumulation in rice

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K06004
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 39020:Crop production science-related
• Research Institution: Ishikawa Prefectural University
• Principal Investigator: Tsukaguchi TadashiTadashi 石川県立大学, 生物資源環境学部, 准教授 (40345492)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: イネ / 子実 / 窒素 / 分配 / QTL / 子実窒素集積性

Outline of Final Research Achievements

Nitrogen accumulation in grain is associated with N partitioning in the grain-filling period in rice plants, affecting yield and N use efficiency because it accompanies N remobilization and translocation from vegetative parts. We found a close relation between N content in total plants per grain dry weight (TNA/GW) and grain nitrogen concentration (GNC) and a large cultivar difference in the regression coefficient (A) between them. Using the population derived from Momiroman, with low A, and Takanari, with high A, we found quantitative trait loci (QTLs) for A on chromosomes 6 and 10, the Takanari alleles of both QTLs increased the value. We produced near isogenic lines (NILs) to validate the effect of the QTLs. NILs with the Takanari allele in each region had higher A than NILs with the Momiroman alleles, verifying the effect of the QTLs on A.

Free Research Field

作物学

Academic Significance and Societal Importance of the Research Achievements

イネなどの作物において子実への窒素分配は収量性や窒素利用効率に強く影響する。イネにおいて窒素分配に関わると考えられる子実の窒素集積性が遺伝形質であることを明らかにし、その定量評価法の確立およびその評価法による量的形質遺伝子座（QTL）の推定を行ってきた。本課題においてこのQTLの子実窒素集積性への効果が実証され、子実への窒素分配を通じた収量性や窒素利用効率の向上につながることが期待される。