春播超甜玉米籽粒果皮厚度与可溶性总糖含量在灌浆期间的变化

Changes of pericarp thickness and soluble sugar during the kernel filling process of spring super-sweet corn

试验对9个不同熟期的超甜玉米品种以授粉后不同时间采收果穗籽粒可溶性总糖含量进行测定,及对籽粒3个面的果皮厚度采用显微测微法进行测量与方差分析。结果表明:不同熟期的超甜玉米品种籽粒的3个面的果皮厚度在授粉后灌浆期间均出现相对独立的变化趋势,同时不同品种的可溶性总糖含量均在授粉后18～22 d出现了最大值,结合两者分析,春季播种的不同熟期超甜玉米适宜采摘期不同,早熟的超甜玉米品种鲜穗采摘期适宜在授粉后第18天左右,中熟超甜玉米品种鲜穗采摘期适宜在授粉后第20天左右,迟熟超甜玉米品种鲜穗采摘期适宜在授粉后第22天左右。

The soluble sugar and pericarp thickness with three surfaces through the nine different ripe periods of super-sweet corn varieties in different grain harvest time were determined and analyzed.The results showed that the pericarp thickness with three surfaces showed relatively independent trends in different ripe periods of super-sweet corn,and the maximal content of soluble sugar appeared in 18-22 days after pollination.The harvest time of super-sweet corn in different ripe stages was different.The picking period of fresh ear of precocious super-sweet corn variety was 18 days or so after pollination,which was 20 days and 22 days after pollination for middle ripe super-sweet corn variety and late ripe super-sweet corn variety,respectively.