春玉米还原糖含量变化的研究

本试验对春玉米的叶片、叶鞘、茎秆和雌雄穗等器官的还原糖含量的变化进行了分层次的系统研究。结果表明,随着春玉米生长发育进程,各器官还原糖含量呈大幅度升降变化;拔节期和大喇叭口期叶片还原糖含量的两个峰值揭示了春玉米高产栽培需氮“前轻后重”的内在原因;生长中心器官的还原糖含量高,是器官迅速建成的生理基础;氮肥主要影响叶片的生长及生理代谢活性,进而影响叶鞘和茎秆建成,最终影响经济产量。在本地土壤条件下,产量的限制因素是“源”而不是“库”。

A Study on the Changes of Reducing Sugar Content in Spring Maize

The changes of reducing sugar content were studied systematically in the blade, blade sheath, stem, tassel and ear of spring maize according to its distribution in different organs in this experiment. The results showed that the content of reducing sugar in the organs fluctuated considerably with growth and development of spring maize. During the jointing stage and the floret differentiation stage of the tassel, two peak values of reducing sugar content in blades revealed the reason why less N fertilizer is needed during the early growth stage and more during the later stages of spring maize under high-yield cultivation. The higher content of reducing sugar in the main growth organ was the physiological basis for its rapid formation; N fertilizers mainly affected blade growth, physiological metabolism activity, formation of the blade sheath and stem, and eventually the economic yield. The limiting factors of maize yield were 'sources' rather than 'sinks' under local soil conditions.