用电子显微镜和立体学方法考察了自然条件下小麦叶片衰老过程中超微结构的立体学参数变化及6-苄氨基嘌呤(BA)的调节作用,结果表明;在叶片衰老过程中叶绿体的体积膨胀且由椭球形变为球形,其体密度、面密度和数密度均下降;基粒变小且失去严整性,类囊体膨胀,但每叶绿体中基粒的数目在衰老早期是增加的;BA能够维持叶绿体和基粒结构、形态的稳定,对各立体学参数均有一定影响。 The ultrastructural parameters of wheat during senescence and the regulation of 6-benzylaminopurine (BA) were examined by electron microscopy and stereological methods. The results showed that the volume expansion of chloroplasts during leaf senescence The body density, surface density and number density decreased; the size of the matrix decreased and the integrity of the thylakoid decreased, while the number of the thylakoid increased. However, the number of the basal grains per chloroplast increased in the early senescence. BA Can maintain the chloroplast and the grana structure, the stability of morphology, have a certain impact on the parameters of each stereology.