放射線에 依한 水稻 高蛋白質系統의 選拔에 關한 硏究

Selection of High Protein Mutant in Rice by Radiation

放射線에 依한 水稻變異系統에 있어서 高蛋白質系統의 選拔을 위하여 蛋白質含量의 變異와, 高蛋白質變異系統에 있어서 몇 環境條件에 따른 蛋白質變異, 蛋白質含量과 몇 農耕形質과의 相關, DBC方法과 Kjeldahl方法에 依한 蛋白質과의 相關에 對하여 調査하였다. 1. 變異系統에 있어서 蛋白質含量의 變異幅은 넓고 母品種을 100으로 했을 때 最低 68%, 最高 168% 增加되었다. 2. 高蛋白質變異系統中에서는 母品種에 比해 기타 形質이 優秀한 有用한 系統을 選拔할 수가 있었다. 3. 高蛋白質變異系統은 窒素施肥量의 增加와 함께 蛋白質含量이 增加되고, 播種期의 지연에 따라 增加되었다. 4. 高蛋白質變異系統에 있어서 栽植密度에 따른 蛋白質含量은 系統에 따라 傾向이 달랐다. 5. 蛋白質含量과 稈長과는 有意的인 負의 相關이 있었다. 6. DBC 方法과 Kjeldahl 方法에 依한 蛋白質含量問에는 有意的인 正의 相關이 있었다.

Protein screening on 809 rice mutants induced from six leading varieties, by means of nuclear radiations, was conducted by conventional micro-Kjeldahl method. For serveral protein enriched mutants selected, effects of agronomic practice on the variability of protein contents were also examined. The results are summarized as follows: 1. Protein contents of the mutants varied between 68 to 168% relative to their mother varieties. 2. Some of the protein enriched mutants was found to possess positive agronomic characters. 3. Heavier application of nitrogen favoured protein enrichment while early swing reduced protein content. 4. Dense planting increased protein contents-the increment being mutant specific. 5. Correlation was found between protein content and culm length. 6. The correlation coefficient for protein content was found to be significant between the Kjeldahl and DBC method.