Assessment of Seedling Growth and Seed Utilization Potential of ‘Baromi2’ at Reduced Germination Rate

Jaekyeong Baek; Seoyoung Yang; Yu-na Kim; Yeong-Seo Song; Sugwon Roh; Miok Um; Jung-Il Cho; Wunha Hwang; Jiyoung Shon

doi:10.7740/kjcs.2025.70.4.241

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2025 Vol.70, Issue 4 Preview Page Next Page

Original Research Article

Assessment of Seedling Growth and Seed Utilization Potential of ‘Baromi2’ at Reduced Germination Rate ‘바로미2’ 발아율 저하에 따른 어린모 생육 특성 및 종자 활용 가능성 평가

1 December 2025. pp. 241-247

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Abstract

Climate change-induced temperature increases have led to frequent heat stress during the rice grain-filling stage, resulting in reduced starch accumulation, higher rates of immature or pre-germinated grains, and reduced in seed germination and vigor.‘Baromi2’, a floury rice cultivar, is particularly susceptible to pre-harvest sprouting even under relatively low cumulative ripening temperatures. Because of severe heat conditions during the 2024, seed quality deterioration prompted consideration of temporarily lowering germination standard for ‘Baromi2’ from 85% to 80%. This study evaluated how reduced germination level influences early seedling performance and identified a suitable seed disinfection and water management method for stable nursery production. Seven seed lots produced in 2024 from three regions were tested. Appearance analysis of brown rice showed that seeds with 80% germination had lower perfect grain ratios and higher immature and damaged grain proportions compared with 85% germination seeds. Seedling growth was assessed after applying three treatments: non-disinfection, chemical treatment, and hot-water treatment. Hot-water treatment significantly reduced emergence in 80% germination seeds, showing an 8% point decrease compared with 85% seeds, whereas chemical treatment maintained stable seedling establishment except in lots with high immature grain ratios. Under high-temperature nursery conditions (27°C), continuous flooding increased seedling height by approximately 5.5% compared with standard irrigation, indicating a greater risk of elongation, however germination rates had no significant effect on seedling establishment. Overall, stable seedling production is feasible even when germination decreases to 80%; however, hot-water disinfection should be avoided, and careful water management is required to prevent excessive elongation under high-temperature nursery conditions.

Keywords

Baromi2

germination percent

rice

seedling rate

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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 : 70
No :4
Pages :241-247
Received Date : 2025-11-17
Revised Date : 2025-11-19
Accepted Date : 2025-11-20
DOI :https://doi.org/10.7740/kjcs.2025.70.4.241

The Korean Journal of Crop Science ISSN:0252-9777(Print) 2287-8432(Online) 한국작물학회지

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