不同类型专用小麦籽粒淀粉及其组分积累动态

在田间条件下,研究不同类型专用小麦品种籽粒淀粉积累动态。结果表明:不同类型专用小麦籽粒中总淀粉、直链淀粉、支链淀粉含量随籽粒灌浆充实而不断上升,且其含量增加速率呈“慢—快—慢”的趋势,直链淀粉含量增加速率在花后25~30 d时达最大值,总淀粉、支链淀粉含量增加速率高峰则出现在花后15~20 d;籽粒中总淀粉、直链淀粉、支链淀粉积累量变化均呈“S”型曲线,直链淀粉积累速率在花后25~30 d时达峰值,支链淀粉、总淀粉积累速率在花后20~25 d时达峰值。直链淀粉/支链淀粉比例随籽粒灌浆历程的推移呈“V”型曲线变化。不同专用类型小麦籽粒中总淀粉、直链淀粉、支链淀粉含量由高到低依次为弱筋小麦、中筋小麦、强筋小麦,积累量顺序则相反。

Accumulation characteristics of starch and its components in grains of wheat for different end uses

Dynamics of grain starch accumulation in wheat for different end uses were studied.The results showed that amylose,amylopectin and starch contents in grains increased gradually after anthesis.The maximum amylose content increasing rate and accumulating rate appeared on the 25-30th day after anthesis(DAA),while the maximum amylopectin content increasing rate and accumulating rate appeared on the 15-20th DAA and 20-25th DAA respectively.The ratio of amylose to amylopectin showed "V" type curve change.The order of starch,amylose and amylopectin contents in grains among varieties for different end uses was weak-gluten wheat > middle-gluten wheat> strong-gluten wheat,while the order of their accumulation amounts was opposite.