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Effect of proton beam irradiation on germination, seedling growth, and pasting properties of starch in rice |
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| Authors: | Sang-Kuk Kim Shin-Young Park Kye-Ryung Kim Jong-Hee Shin Su-Yong Kim Hak-Yoon Kim In-Jung Lee |
| Institution: | 1. Division of Crop Science, Gyeongsangbuk-do Provincial Agricultural Research and Extension Services, Daegu, 702-708, Republic of Korea 2. Department of Clinical Pathology, Jeju Halla University, Jeju Special Self-Governing Province, Jeju, 690-708, Republic of Korea 3. Proton Engineering Frontier Project, Korea Atomic Energy Research Institute, Daejeon, 305-353, Republic of Korea 4. Department of Global Environment, Keimyung University, Daegu, 704-701, Republic of Korea 5. Division of Plant Biosciences, Kyungpook National University, Daegu, 702-701, Republic of Korea |
| Abstract: | This study was carried out to determine the pretreatment effect of proton beam irradiation on germination and pasting properties of starches in two rices. Mature and healthy seeds irradiated with 10 doses (0, 50, 100, 200, 300, 400, 500, 600, 700, and 800 Gy) for determination of LD50 and characteristics of germination were recorded at 14 days after irradiation. The rice seeds irradiated with five doses (0, 50, 100, 200, and 300 Gy) were used to evaluate the irradiation effects of pasting properties of starches. It showed that a lower survival rate in germinated rice seeds was observed above 300 Gy showing 31 and 35% in Ilpum and Hanmaum, respectively. The higher plant height and root length were also recorded in 50 and 100 Gy. Amylose content in proton beam irradiated with 50, 100, 200, and 300 Gy was significantly decreased in two rice cultivars. Peak viscosity, hot peak viscosity, cooling peak viscosity, and setback viscosity decreased with increasing proton beam dose levels. The degree of crystallinity was significantly increased with increasing proton beam dose levels. Consequently, it might be deduced that proton beam irradiation causes changes of starch properties affecting crystalline regions of starch granules, especially at high dosage irradiation. |
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