镉胁迫对不同家系杂交鹅掌楸生长及抗性的影响  

Cadmium stress on growth and resistance of hybrid tulip trees:Liriodendron chinense×Liriodendron tulipifera

作　　者：赵志新[1] 乔瑞芳[1] 季孔庶[1] 

机构地区：[1]南京林业大学林木遗传与生物技术省部共建教育部重点实验室,江苏南京210037

出　　处：《浙江林学院学报》2009年第5期667-673,共7页Journal of Zhejiang Forestry College

基　　金：国家自然科学基金资助项目(30070633)

摘　　要：采用盆栽方法,研究了杂交鹅掌楸Liriodendron chinense×L.tulipifera5个家系1年生实生苗对土壤镉胁迫的生理响应与抗性。结果表明,在镉胁迫下,杂交鹅掌楸叶片失绿变黄,根系腐烂变黑,且高质量分数镉胁迫下植株受抑制程度越明显。随着镉胁迫时间延长,各家系相对电导率和丙二醛(MDA)质量摩尔浓度均出现了上升趋势,胁迫增加上升趋势更明显。在100mg·kg-1胁迫下,5个家系间超氧化物歧化酶(SOD)活性变化不一致;在200mg·kg-1胁迫下,5个家系SOD活性变化是先升后降,胁迫结束时,NEF11家系SOD活性下降最大,相比对照降幅为41.5%。采用隶属函数对上述指标进行综合分析,得出5个家系在土壤镉胁迫下的抗性顺序为:NEF14>NEF15>NEF12>NEF13>NEF11。To understand the resistant ability of tulip tree hybrid （Liriodendron chinense × Liriodendron tulipifera） under the soil Cd（cadmium） stress,annual seedlings from five families labeled NEF11 to NEF15 of tulip tree hybrid planted in plastic pots with 0,100 and 200 mg·kg^-1 soil Cd stress were studied. The re-sults showed that the leaves of the annual seedlings turned yellow and roots rotted as the Cd stress strength-ened. There were very significant different among the five families to resistant the soil Cd stress. The membrane penetrability and malondialdehyde （MDA） content in the leaves increased with the Cd stress prolong and strengthened. Change tendency of SOD activities among the five families was different under 100 mg·kg^-1 Cd stress, and the SOD activities increased at first and then decreased under 200 mg· kg^-1 Cd stress. The SOD activities in NEF11 decreased the largest at last, and its decline rate was 41.5% over the ck（contrasting）. Subordinate function analysis for resistant ability to soil Cd stress of the five families was in the order： NEF14〉NEF15〉NEF12〉NEF13〉NEF11.

关 键 词：植物学 镉胁迫 杂交鹅掌楸家系 生理响应 抗性 

分 类 号：S718.0[农业科学—林学]