The paraffin section of the flag leaf of wheat during its senescence was observed with SEM.The results showed: 1) during the senescence of wheat, the nuclear shape altered obviously.

• 对小麦旗叶衰老过程中的石蜡切片进行扫描电镜观察，结果表明，(1)旗叶衰老过程中，细胞核形态发生明显变化。