镉胁迫对桃树根尖细胞超微结构的影响  

Effect of cadmium stress on the ultrastructure of cell in peach root apex

作　　者：关伟[1] 张金珠[1] 王占全 刘明[1] 闫君君[1] 王有年[3] 仝宝生 师光禄[3] 

机构地区：[1]北京市平谷区人民政府果品办公室,北京101200 [2]北京市平谷区马昌营镇人民政府,北京101200 [3]农业部都市农业(北方)重点开放实验室北京农学院生物技术学院,北京102206 [4]内蒙古永业生物技术有限责任公司,呼和浩特010010

出　　处：《北京农学院学报》2010年第3期18-20,共3页Journal of Beijing University of Agriculture

基　　金：国家自然科学基金资助项目(30872029);北京市自然科学基金重点项目(6071001);北京市自然科学基金项目(6092007);北京市教委重点项目(KZ201010020016);北京市教委平台建设项目;北京市属高校人才强教深化计划资助项目(PHR20090516;PHR200906134)

摘　　要：以水培丽春桃幼苗为材料,pH为5.6,研究不同镉浓度(4,16 mg/kg)对桃树根系细胞超微结构的影响。经透射电境观察表明,随营养液中镉浓度加大和处理时间的延长,桃树根系细胞超微结构变化明显。在16mg/kg镉处理下9 d时,桃根细胞发生质壁分离,染色质凝聚、核膜断裂、核仁消失、液泡膨胀、线粒体数目和嵴突减少直至消失,细胞破裂直至细胞结构解体。The seedlings of ＇Lichun＇peach（Prunus Persica） were grown in MS nutrient solutions at different levels（4 mg/kg,16 mg/kg） of cadmium at pH 5.6 and the cell ultrastructure of peach root apex were studied.By transmission electron microscope,the cell ultrastructure of peach root changed significantly along with increasing days and concentrations under Cd stress.After 9 d of suffering from Cd concentration at 16 mg/kg,the cell root membrane separated from its wall,meanwhile,the polymerized chromatin,the disruption of karyotheca,the disaggregation of nucleolus,the swollen vacuole,the reduction mitochondria numbers,cristae and even disintegration were observed in mitochondria,cell break,and finally led to the disaggregation of cell structure.

关 键 词：桃树 镉胁迫 超微结构 根尖 

分 类 号：S622.101[农业科学—园艺学]