用X 射线对比剂法测定种子生活力只需几分钟就可以产生X 射线图象,短时间内可以检验大量样品。X 射线对比法的生物学基础是利用一种对比剂能使种子的死亡和受伤的组织着色,而对比剂不能浸透健康生物细胞的半透膜组织。对比剂吸收X 射线积聚在种子受伤或死亡组织,产生较强的阴影,在X 射线图象上出现明显的反差。根据种子在X 射线图象上出现阴影的区域和位置,就可以评定种子的发芽能力。 X-ray contrast agent method to determine the viability of seed in just a few minutes to produce X-ray images, a short period of time can test a large number of samples. The biological basis of X-ray contrast is the use of a contrast agent to stain the dead and injured tissue of the seed while the contrast agent can not penetrate the semi-permeable tissue of healthy living cells. The contrast agent absorbs X-rays and accumulates in the injured or dead tissue of the seed resulting in strong shadows and significant contrast in the X-ray image. The germination capacity of the seed can be assessed on the basis of the shadowed area and location of the seed on the X-ray image.