糯和非糯玉米发育早期对Cr^(6+)胁迫的响应  

Effects of Cr^(6+) Stress on Early Growth of Glutinous and Non-glutinous Maize

作　　者：郑爱珍[1] 

机构地区：[1]商丘师范学院生命科学系,河南商丘476000

出　　处：《河南农业科学》2010年第6期27-30,共4页Journal of Henan Agricultural Sciences

基　　金：河南省自然科学基金项目(0511030200);河南省教育厅科技攻关项目(200510483005)

摘　　要：采用溶液培养的方法,研究了重金属Cr6+污染对糯和非糯玉米发育早期生理生化指标的影响。结果表明,糯和非糯玉米幼苗根和上胚轴中丙二醛(MDA)含量和细胞膜透性随着铬质量浓度的增加而增大;超氧化物歧化酶(SOD)和过氧化物酶(POD)是植物体内2个重要的保护酶,10 mg/LCr6+处理对糯和非糯玉米的根和上胚轴SOD活性具有显著的抑制作用,随着铬质量浓度的加大,抑制效应更为显著;脯氨酸(Pro)和过氧化物酶(POD)活性随着铬质量浓度的增加呈现先升后降的趋势,暗示Pro和POD对铬胁迫具有较强的适应性,在玉米抗铬胁迫的过程中起着重要作用;根对铬胁迫的反应敏感于上胚轴,且糯玉米对铬的耐受力弱于非糯玉米。A hydroponic experiment was carried out to investigate the effects of Cr^6＋ pollution on the physiological and biochemical characteristics of glutinous and non-glutinous maize seedlings.The results showed that both the content of malonyldialdehyde and the permeability of cell membrane in the roots and epicotyls increased with the increase of Cr^6＋ concentration.Superoxide dismutase（SOD） and peroxidase（POD） were two important protective enzymes in plants.10mg/L of Cr^6＋ had significant inhibiting effect on the activity of SOD in the roots and epicotyls of seedlings,the inhibiting effect being more obvious with the increase of Cr^6＋ concentration.The activity of peroxidase and praline（Pro） increased firstly and then decreased with the increase of Cr^6＋ concentration,suggesting that POD and Pro had great adaptability to the chromium stress,and played a critical role in resistance to chromium stress in maize.The maize root was more sensitive to chromium stress than epicotyl,and non-glutinous maize was more tolerant to chromium than glutinous maize.

关 键 词：糯玉米 非糯玉米 Cr6+ 生理生化 

分 类 号：S513[农业科学—作物学]