小麦不稔症是指虽有完整花器但不形成种子的现象。不包括因没有花器以及花器残缺而不能形成种子,也不包括能形成种子而不能发育成正常大小的秕粒现象。小麦不稔症症状在抽穗前,从外形、颜色、生长繁茂性上和正常的相比,看不出有多大差别。抽穗后,患株穗色浅黄绿,迎着阳光看,穗呈半透明状态。开花时,穗型蓬松,颖壳开张角度较大。患株雄蕊发育不良,严重者花丝不能正常伸长,花药瘦小、空秕,呈箭头形、弯月形或X形。花药不能开裂,不能散粉或完全没有花粉;能开裂散粉的,大多数花粉粒畸形,用碘化钾溶液染色 Homology of wheat refers to the phenomenon that although there is a complete flower but no seed is formed. It does not include the inability to form seeds due to the absence of flowers and the fragmentation of flowers. Nor does it include the phenomenon of seeds that can not form seeds and develop into normal size. The symptoms of wheat hirsutism before heading, from appearance, color, growth and lushness compared to normal, do not see how much difference. After heading, the plant ear color yellowish green, facing the sun, the ear was translucent state. Flowering, the panicle fluffy, husk opening angle larger. Sick stamens stunted, severe filaments can not be normal elongation, anther lean, empty 秕, arrow-shaped, meniscus or X-shaped. Anthers can not be cracked, can not loose powder or no pollen; can crack loose powder, the majority of pollen grains deformity, staining with potassium iodide solution