Redesigning ideal crop canopy architecture using drone-based phenotyping techniques

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05537
• 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: Hokkaido University
• Principal Investigator: NAKASHIMA TAIKEN 北海道大学, 農学研究院, 助教 (70710945)
• Co-Investigator(Kenkyū-buntansha): 加藤 洋一郎 東京大学, 大学院農学生命科学研究科(農学部), 教授 (50463881) ; 郭 威 東京大学, 大学院農学生命科学研究科(農学部), 准教授 (70745455)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 子実用トウモロコシ / 倒伏 / 風応答 / 草型 / 群落構造

Outline of Final Research Achievements

The relationship between wind response of crop canopy structure and its architectural characteristics was evaluated in maize to clarify the ideotype possessing both high yielding ability and lodging resistance with minimal biomass allocation to stalk and root system. To this end, we developed platforms to facilitate characterization of canopy structure and plant architecture with the aid of three-dimensional point cloud reconstruction technique, as well as to quantify the dynamic wind response of above-ground plant structure under natural wind using ultra-micro accelerometers mounted on the stalk. The results suggested that the areal density and morphological traits of leaves in the upper to middle layers of the canopy differed significantly in the lodging resistant variety, which could potentially function as avoidance mechanisms of high wind pressure on the canopy when lodging risk was elevated under strong wind.

Free Research Field

作物学

Academic Significance and Societal Importance of the Research Achievements

台風が毎年のように襲来するわが国では，倒伏による作物の減収が農学の重要課題となっており，収量性の向上と倒伏リスクの軽減を両立するための方策が求められている．これまでも作物の倒伏研究は盛んに行われてきたが，根系支持力強化や茎の強靭化に焦点を当てたものが多く，実際に風圧を受ける作物地上部の構造や葉の形状・配置に関する報告は少ない．今後，根系や茎部をさらに強化しつつも，本研究で示唆された風圧を受け流すうえで有利な地上部の構造特性を倒伏抵抗性品種の育種に利用することで，地上部・地下部構造の最適化を通して耐倒伏性と収量性の両立に貢献するものと考えられる．