Root morphological and anatomical characteristics of rice in response to soil environmental changes

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K15216
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Nagoya University
• Principal Investigator: Kano-Nakata Mana 名古屋大学, 農学国際教育研究センター, 助教 (70623958)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: イネ / QTL / 通気組織 / 天水田 / 土壌水分変動 / 非破壊根系解析

Outline of Final Research Achievements

Rainfed lowland rice ecosystems greatly varied in water availability and experience soil moisture fluctuations (SMF), which influence root development and then plant growth. We evaluated the root response under SMF with special emphasis on the relationship between root morphology and anatomy along root axis focusing on different ages. Also we characterized soil and climate environments in rainfed lowland fields in Philippines.
The greater root elongation below the hardpan soil layer contributed to high adaptation to SMF, and this was related to root arenchyma formation and sclerenchyma development. However, these responses were not synchronized at the same position. The field study in Philippines showed that the main limiting factor of rice yield was low solar radiation during wet season, but combination of drought and nitrogen deficiency during dry season.

Free Research Field

作物生産科学

Academic Significance and Societal Importance of the Research Achievements

最近の急速な育種学の進歩によって、根をデザインすることが現実味を帯びてきており、根系育種によってストレス耐性の付与が可能である。単に水ストレスに強いだけではなく、節水栽培適応品種の開発を通して、世界中で問題となっている深刻な水不足の解決にもつながる。作物生産活動が実際に行われているフィールドでの現象に注目することで、栽培環境にあわせた有用根系形質を抽出でき、今後実用性を有した根系育種が期待できる。