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玉米雄穗比雌穗一般早3-5天抽出。雄穗抽出后,可以根据其主轴长短、粗细及小穗、花药、颖壳等形状,预测果穗和子粒的形状,这对玉米育种工作是很有帮助的。 (一)生育期识别:早熟自交系株形较小,叶片较窄,苗期穗分化早,抽雄穗也较早。雄穗分枝短小细少,花药与颖壳小且短。晚熟自交系与此正好相反。 (二)粒型识别:硬粒型与马齿型在雄穗上的差异,主要表现在主轴形状、颖壳大小和茸毛多少上。雄穗主轴较粗、顶端盾圆、颖壳小而光滑、手摸感觉发硬者,多数是硬
Ear of corn tassels 3-5 days earlier than the general withdrawal. After the tassel has been extracted, the shape of the ear and the grain can be predicted according to the shape of the main axis, the length, the thickness, the shape of the spike, the anther and the glume. This is very helpful for the breeding of corn. (A) identification of growth period: Early inbred lines smaller plant shape, narrow leaves, early seedling stage differentiation, tassel earlier. Short and small tassel branches less, anthers and glume small and short. Late-maturity inbred lines are just the opposite. (B) Particle Recognition: Hard-type and dent-type difference in the tassel, mainly in the shape of the spindle, the size of hay and hair on the number of. Sparse tassel spindle, the top shield round, small and smooth glume shell, hand feeling hard, most are hard