Testa of seed consists of four layers which becomes hard and woody after ripening.

芡种子的种皮共有四层,成熟后坚硬,种皮外有假种皮,有增加浮力的作用.

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Germination inhibitor may inhibIt'seed embryonic development; it would not relate to physiological after - ripening.

萌发抑制物的存在可能抑制了种胚发育, 而与生理学后熟过程无关.

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