氮素用量对春玉米淀粉及其组分形成积累的影响

Effects of Nitrogen Application on the Forming and Accumulation of Starch and Its Compositions of Spring Maize

采用田间试验研究氮素用量对高淀粉玉米(四单19)、普通玉米(东农250)、优质蛋白玉米(丰禾10)子粒淀粉及其组分含量和支链淀粉/直链淀粉比值动态变化的影响。结果表明:3个品种支链淀粉、直链淀粉、总淀粉含量在吐丝后不断增加。各品种总淀粉含量以N200最高,四单19和丰禾10支链淀粉含量以N200最高,支链淀粉和总淀粉含量品种间以四单19表现最好。四单19直链淀粉含量以N200最高,丰禾10直链淀粉含量随氮素用量的增加而增加。子粒支链淀粉/直链淀粉比值在吐丝后呈下降趋势。

The effects of nitrogen application on dynamic changes of starch and its compositions and ratio of amylopection to amylose in grains of spring maize （high starch maize SIDAN19, common maize NEAU250, good quality protein maize FENGHE10） were studies in field experiment. The results showed that contents of amylopectin, amylose and total starch went up in spring maize grains after spinning. The highest total starch content was found at the level of N200 in grains for all tested varieties, the highest amylopectin contents of SIDAN19 and FENGHE10 were found at the level of N200 in grains, SIDAN19 was the best tested variety at this aspect of total starch and amylopectin contents. The amylose content of FENGHE10 increased with the raise of nitrogen application, but the highest amylose content of SIDAN19 was found at the level of N200. The ratio of amylopectin to amylose fell gradually after spinning.