【摘要】 对低能氮离子注入甜菊种子引起的生长发育、细胞核和染色体形态结构的影响进行研究 .结果表明 ,能量为 75Ke V、剂量为 10 14 / cm2的氮离子束注入甜菊种子后 ,种子萌发率下降 ;幼苗期生长迟缓 ;细胞分裂指数下降 ,异常细胞核和染色体畸变增加 ,细胞核膜凹凸不平 ,核仁解聚 ,部分核质凝集并被凹陷的核膜包被成颗粒化小区 ,进而形成微核 ,细胞核的形态建成和细胞分裂受到一定的干扰 .推测这些现象与幼苗期处理种子的早期生长发育迟缓有关 .更多还原

【Abstract】 The effect of nitrogen ion implantation on the development and growth, morphological changes of cell nucleus and chromosome of seeds of Stevia rebaudiana Bertoni were Studied.The result showed that the implantation of nitrogen ions at1 0 0 Ke V× 1 0 1 4 cm- 1 inhibited significantly the germinating rate and growth speed of seeds,leading to a decrease in division index of root tip cells,and increase in abnormal cell nuclei,micronuclei and chromosomes.更多还原