春玉米籽粒灌浆期IAA对淀粉积累的作用及其机制的研究

Effect and Mechanism of IAA to Starch Accumulation in Grain During Grain-filling Stage in Spring Maize

以田间种植的高淀粉(郑单19)、高油(通油1号)和普通型(吉单209)春玉米为材料,探讨籽粒形成期生长素(IAA)含量变化与淀粉积累的关系及其作用机制。从授粉后7 d开始,每隔7 d选取果穗测定籽粒的IAA、蔗糖、葡萄糖、果糖和淀粉含量。结果表明,在籽粒灌浆前期郑单19的IAA含量明显高于其它两个品种,淀粉含量也高于其它两个品种,与IAA含量的高低表现出良好的一致性,说明灌浆前期高IAA含量有利于淀粉的合成;在籽粒灌浆前期郑单19的葡萄糖含量高于其它两个品种,与IAA含量的高低顺序表现出一致性,这说明高的IAA含量有利于葡萄糖的生成或者说有利于提高蔗糖酶的活性。

Spring maize hybrids with high starch （Zhengdan 19）, high oil （Tongyou 1） and ordinary type （Jidan 209） were planted in the experimental field in Lishu County of Jilin Province （124°18＇ E, 43°21＇ N） to investigate the relationship between IAA content changes and starch accumulation during grain-filling period. After pollinated, the ears were taken from plants every seven days, and then, contents of IAA, sucrose, glucose, fructose and starch in grain were determined. The results showed that IAA and starch contents in Zhengdan 19 were higher than those in Jidan 209 and Tongyou 1 in the early stage of grain-filling period. Furthermore, the change of starch was similar to IAA. It showed that high IAA promoted the synthesis of starch; glucose contents in Zhengdan 19 was higher in the early stage than those in Jidan 209 and Tongyou 1. Furthermore, the change of glucose was similar to IAA. It showed that high IAA promoted the synthesis of glucose or the activity of sucrase.