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2026 Vol.71, Issue 3

Original Research Article

Analysis of changes in plant nitrogen accumulation and distribution in rice (Oryza sativa L.) under shading at major growth stages

벼 주요 생육기별 차광에 따른 식물체 질소 축적 및 분배 변화 분석

Woon-Ha Hwang1*
,
Min-Ji Lee2
황 운하1*
,
이 민지2
1Senior Scientist, National Institute of Crop Science, RDA, Wanju 55365, Korea
2Research Scientist, National Institute of Crop Science, RDA, Suwon 16429 Korea
1농촌진흥청 국립식량과학원 농업연구관
2농촌진흥청 국립식량과학원 전문연구원
*Corresponding Author
1 September 2026. pp. 89-97
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Abstract

Crop damage caused by shading has been increasing due to rapid urbanization and climate change. In this study, we analyzed changes in dry weight, nitrogen content, and accumulated 15N content under different shading rates at major growth stages in rice. As the shading rate increased, dry weight tended to decrease. A marked reduction in dry weight was observed under 55% shading during the basic vegetative phase (BVP) and reproductive phase (REP), and under 65% shading during the ripening phase (RIP) and whole growth period (WH). When shading was applied during the BVP, the stem dry weight decreased substantially. Under shading during REP, the dry weight of all plant parts decreased, indicating that this was the stage most sensitive to shading. Under shaded conditions, the nitrogen content per unit weight tended to increase. In particular, strong negative correlations were observed between dry weight and nitrogen content in the stem during the BVP and in the leaves during the REP. Root-derived 15N was mainly distributed in the stem under non-shading conditions, whereas shading decreased total 15N accumulation and altered its distribution, with a relatively higher allocation to leaves.

Keywords
nitrogen
rice
shading growth stage
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Information
  • Publisher :The Korean Society of Crop Science
  • Publisher(Ko) :한국작물학회
  • Journal Title :The Korean Journal of Crop Science
  • Journal Title(Ko) :한국작물학회지
  • Volume : 71
  • No :3
  • Pages :89-97
  • Received Date : 2026-06-15
  • Revised Date : 2026-07-21
  • Accepted Date : 2026-07-23
  • DOI :https://doi.org/10.7740/kjcs.2026.71.3.089
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