쌀 Amylose 含量의 遺傳 및 變異性에 關한 硏究

Studies on Inheritance and Variability of Amylose Content of Rice Kernels

This study was mainly concerned about the inheritance of amylose content of rice kernels as it was analyzed by unit of single grain. Eight varieties showing different levels of amylose content were taken. They were first treated at different ripening conditions such as temperatures, planting dates, day lengths and nitrogen applications to find out the varietal differences in variations of amylose content. Next, modified IRRI (International Rice Research Institute) method was applied to analyze in unit of single grain. The revised one was compared with original IRRI method to confirm its availability. Finally, the four of high, two of intermediate and two of low varieties in amylose content were crossed each other to observe their segregations in F₂. The results obtained are summarized as follows: 1. The amylose content of rice kernels showed some variations with different environmental conditions especally during the ripening periods. However, the differences of amylose content among the high, internadiate and low groups of rice varieties were always clearly observed. The varietal differences were higher than the environmental variations within varieties. 2. The amylose content analyzed by the modified IRRI method showed a little higher value than IRRI method. But it was proved to be possible for use at least in case of relative comparison between varieties or lines. 3. High amylose was dominant to low with 3 : 1 segregation ratio in six crosses out of eight crosses of High×Low, and the other two crosses were not fitted to any conventional segregation ratio.