that in the microspore stage, the content of praline and lysine and the activity of CAT and SOD in fertile cultivars are significantly higher than those in sterile ones;

• 在小孢子期，可育品种脯氨酸和赖氨酸含量显著高于不育品种，过氧化氢酶和超氧化物歧化酶活性也是可育品种高于不育品种；