研究结果表明:甜菜子叶气孔密度是其品种的特性,高糖型甜菜子叶气孔密度明显大于丰产型品种,与含糖率密切相关,可作为选择高糖型品种的指标。选择时期是在苗期4片真叶末期,这种选择方法具有活体、简便和较为准确的特点,对提高选择效率、加速选育进程具有重要的理论和实践意义。 The results showed that the stomatal density of beet leaf was the characteristic of its varieties. The stomatal density of high sugar beet leaves was significantly higher than that of high yielding varieties, which was closely related to the sugar content and could be used as an index to select high sugar content varieties. The selection period is at the end of 4 true leaf stage at the seedling stage. This selection method has the characteristics of living body, simplicity and accuracy, and has important theoretical and practical significance for improving the selection efficiency and accelerating the breeding process.