两种穗型水稻穗上不同粒位籽粒淀粉黏滞谱特征的比较分析

Comparisons of RVA Profile Characteristics of Grains at Different Grain Positions of Panicle between Two Panicle Types of Japonica Rice

利用3个直立穗型和3个弯曲穗型粳稻品种研究了两种不同穗型水稻穗上不同粒位籽粒淀粉RVA谱特征的差异。结果表明:穗内不同粒位间籽粒的淀粉黏滞特性的差异幅度和变异系数大小因品种而异,与穗型特征无关。淀粉黏滞特性好坏与其颖花在穗上的开花顺序有密切联系,早开花籽粒的淀粉黏滞特性强于晚开花籽粒。一次枝梗上的6个粒位的RVA谱特征值排列顺序以第1,6,5粒位较高,第2粒位最低;二次枝梗上的3个粒位排序为第1粒位>第3粒位>第2粒位。从空间上看,整穗粒位间从上到下,淀粉黏滞特性有逐渐变劣的趋势。

Under the field conditions,three Japonica cuhivars with erect panicle and three Japonica cuhivars with curved panicle were applied to compare the difference of RVA profile characteristics in the grains between dif- ferent grain positions in two different panicle type. Results indicated the range of difference and variation coefficient（CV） of RVA profile characteristics in the grains between different grain positions varied with cuhivars,which had no correlation with panicle type. The variation in starch viscosity characteristics of different grains within a panicle was closely related to the flowering order of rice grains on the rachis branches. Starch＇viscosity characteristics for thegrain of the spikelets that flowered earlier were superior to those for the grain of the spikelets that flowered late. RVA profile parameters for the grain 1,6 and 5 on the primary branch showed the highest,the grain 2 the lowest. The order of RVA profile parameters on a secondary branch within a panicle was the grain 1 〉 the grain 3 〉 the grain 2. From space,starch viscosity characteristics are gradually deteriorate from top to bottom in the entire spikelets.