PA content in the panicles of CMS line was lower than these in those of its maintainer line.Treatment with MGBG decreased Spd and Spm levels in both lines,and pollen fertility in maintainer line.

• 不育系幼穗多胺含量显著低于保持系幼穗, 外施MGBG使两系幼穗Spd和Spm含量下降, 并使保持系花粉育性降低。