玉米幼苗器官根茎和胚芽鞘对不同播种深度的反应不同,根茎是随着播种深度的加深成比例的增长,胚芽鞘虽然也随着播种深度的加深而增长,但不成比例。胚芽鞘的最大伸长量在品种间的差异较小,难以做为生态型的分类依据,而根茎的最大伸长量在品种间差异显著,似可做为生态型的一种分类依据。 Rhizomes and colesons of corn seedlings responded differently to different sowing depths, and their rhizomes increased proportionately with the deepening of sowing depth. Although coleoptile grew with the deepening of sowing depth, it was disproportionate. The maximum elongation of coleoptile in the varieties of small differences, it is difficult to be ecologically based classification, and the maximum elongation of rhizome significant differences among varieties, it seems to be a classification of ecological basis.