자포니카 벼에서 노화촉진 처리에 따른 종자 활력 및 미질 관련 형질 변화 분석
Analysis of Seed Vigor and Grain Quality Traits under Accelerated Aging Treatment in japonica Rice
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The decrease in seed vigor and grain quality during storage has become an increasinglycritical issue due to the extended storage periods resulting from declining riceconsumption and climate change in Korea. Despite its importance, few studies haveinvestigated rice seed aging in a large number of Korean rice cultivars. In this study, 53japonica rice cultivars were evaluated for seed germination, vigor, and grain quality-relatedtraits under accelerated-aging conditions. Seed germination rate was evaluated 7 daysafter imbibition, following accelerated aging treatments at 42℃ and 95% relative humidityfor 8, 12, and 16 days. The average germination rates were 72.9% in the control (0 d), 71.7%after 8 days, 59.0% after 12 days, and 5.6% after 16 days of treatment. Grain quality-relatedtraits, including texture and pasting properties, were also evaluated in rice subjected to theaccelerated aging treatment. Adhesiveness and stickiness decreased, whereas hardnessand toughness increased, as seed aging progressed. Cluster analysis based on germinationrates after accelerated aging identified three distinct clusters, with cultivars in Cluster3 maintaining a high germination rate of 70.6% even after 12 days of aging, showing cleardifferences from the other clusters. A principal component analysis (PCA) was conductedto investigate the relationship between germination rate and grain quality-related traits. The results showed that the germination rate and hardness tended to be negatively associatedacross all three clusters. These results suggested that cultivars with higher germinationrates tend to maintain a softer cooked rice texture after aging. Our results provideinsight into the relationship between seed aging and grain quality, highlighting elite cultivarsthat maintain both germination ability and grain quality during storage as valuable resourcesfor breeding programs.
Abstract
The decrease in seed vigor and grain quality during storage has become an increasinglycritical issue due to the extended storage periods resulting from declining riceconsumption and climate change in Korea. Despite its importance, few studies haveinvestigated rice seed aging in a large number of Korean rice cultivars. In this study, 53japonica rice cultivars were evaluated for seed germination, vigor, and grain quality-relatedtraits under accelerated-aging conditions. Seed germination rate was evaluated 7 daysafter imbibition, following accelerated aging treatments at 42℃ and 95% relative humidityfor 8, 12, and 16 days. The average germination rates were 72.9% in the control (0 d), 71.7%after 8 days, 59.0% after 12 days, and 5.6% after 16 days of treatment. Grain quality-relatedtraits, including texture and pasting properties, were also evaluated in rice subjected to theaccelerated aging treatment. Adhesiveness and stickiness decreased, whereas hardnessand toughness increased, as seed aging progressed. Cluster analysis based on germinationrates after accelerated aging identified three distinct clusters, with cultivars in Cluster3 maintaining a high germination rate of 70.6% even after 12 days of aging, showing cleardifferences from the other clusters. A principal component analysis (PCA) was conductedto investigate the relationship between germination rate and grain quality-related traits. The results showed that the germination rate and hardness tended to be negatively associatedacross all three clusters. These results suggested that cultivars with higher germinationrates tend to maintain a softer cooked rice texture after aging. Our results provideinsight into the relationship between seed aging and grain quality, highlighting elite cultivarsthat maintain both germination ability and grain quality during storage as valuable resourcesfor breeding programs.