gene overexpression in plants
Physical purity testing refers to the analysis for classifying the composition of a seed lot. It is important for evaluating whether the given seed sample conforms to the prescribed purity standards; and whether it can truly represent the seed lot. Ideally, the working sample should roughly contain at least 2500 seeds. The components of the sample can be screened by naked eyes or using hand magnifiers, microscopes, or semi-automatic inspection stations. Usually, the working sample is separated into four parts (pure seeds, other crop seeds, weed seeds, and inert matters) by hand, blowers, or sieves; and the percentage of each component is then calculated by weight (Figure 1).
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