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在胚不同发育阶段的四个时期内,用γ一射线Co~(60)(5、15、25、50、100千伦)照射龙牙楤木种子。实验结果表明,胚未分化的种子对辐射敏感性最强,完成胚后熟而解除生理休眠的种子敏感性最小;已通过一半和完全通过暖温沙藏期的种子处于中间状态,在敏感性程度上较接近于胚未分化的种子。可见,辐射抵抗性随着胚后熟和生理休眠的解除而增加,这可能是由于胚发育不全的种子生理生化特性所致。已知胚发育不全的种子特点是生理活性物质(维
In four stages of different developmental stages of embryos, A. japonicus seeds were irradiated with γ-ray Co ~ (60) (5,15,25,50,100 Kilon). The results showed that the undifferentiated seeds were the most sensitive to radiation and the least sensitive to the seeds after embryo ripening but relieved physiological dormancy. The seeds which passed half and completely passed the warm-temperate sand period were in an intermediate state, To a degree closer to the embryo undifferentiated seeds. It can be seen that the radiation resistance increased with the release of embryo ripening and physiological dormancy, which may be due to the physiological and biochemical characteristics of embryo hypoplasia seeds. It is known that hypocotyl seeds are characterized by physiologically active substances (dimension