Studies on the quality characteristics of rice kernel

1.研究了籼型、粳稻型和爪哇型栽培稻种子寿命的品种间差异。2.研究了不同胚乳性状水稻突变体种子的寿命和休眠性。暗系寿命长，休眠性强。面粉和巨胚品系寿命短，休眠弱。白心品系具有较长的寿命和较弱的休眠性。研究了水稻种子不同生长时期的日照长度对种子寿命和休眠的影响。长日照诱导休眠，前期处理可显著增强休眠反应。长日照和短日照处理下，小麦的寿命与休眠期呈极显著正相关。4.研究了不同穗位小穗粒、船体大小和矿质元素含量的变异程度。一次枝梗和二次枝梗最远端的小穗与穗内其他部位的小穗不同。5.研究了3种溶出速率的控释氮肥对水稻成熟及稻米品质的影响。糙米蛋白质含量和SHOKUMI值受肥料的影响。蛋白质含量的反应被发现是相当大的下降与快速型敷料。然而，SHOKUMI值增加。这些趋势随着施肥量的增加而增加。

1.Varietal difference on the longevity of cultivated rice seed, Indica type, Japonica type and Javanica type, was studied. Longevity was longest for Indica type and shortest for Japonica type.2.Longevity and dormancy of rice mutant seed with different endosperm characteristics was studied. Dull strain had a long longevity and a strong dormancy. Flour and giant-embryo strains had a short longevity and a weak dormancy. White-core strain has a relatively long longevity and a weak dormancy. Waxy strain was characterized between dull strain and flour strain.3.The effect of day-length at different stages of plant growth on the longevity and dormancy of rice seed was studied. Dormancy was induced by long day-length and this response was found to be considerably enchanced by treatment at earlier stage. The longevity and dormancy showed a significant positive correlation in both the treatment of long and short day-length.4.The extent of variation in kernel and hull size and in the content of mineral from spikelets located at different positions on ear was studied. The most distal spikelet from primary and secondary branches were different with the spikelets from the other positions within a ear.5.The effect of controlled release nitrogen fertilizer for three types of velocity of dissolution on the ripening and kernel quality of rice was studied. Protein content and SHOKUMI value of brown rice was influenced by fertilizer. The response for protein content was found to be considerable decreased by dressing with fast type. However, the SHOKUMI value increased. These trend increased with increasing amount of fertilizer.