重金属Cd胁迫对元宝枫光合特性的影响
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摘要
为了研究重金属Cd对元宝枫光合作用的影响,通过对元宝枫水培苗进行不同浓度的Cd胁迫处理,分析元宝枫叶片中叶绿素含量及其净光合速率的变化。结果表明,随着Cd胁迫浓度的增加,元宝枫叶片中叶绿素a、叶绿素b、叶绿素总量显著降低,净光合速率也明显下降;Cd低浓度胁迫下,元宝枫叶片光饱和点变化不大,Cd高浓度胁迫下,元宝枫叶片光饱和点显著降低。重金属Cd胁迫严重阻碍了元宝枫叶片的光合作用。
To study the effect of heavy metal Cd on photosynthesis of Acer truncatum, the chlorophyll content and its net photosynthetic rate(P(subscript n)) in leaves of A. truncatum were analyzed by Cd stress treatment. The results showed that the total chlorophyll a, chlorophyll b and the total chlorophyll contents decreased significantly and leaf net photosynthetic rate(Pn) of leaves decreased with the increase of the stress concentration. Under low concentration stress, the light saturation point of A. truncatum leaves changed little, and the light saturation point of A. truncatum leaves decreased significantly under high concentration stress. The photosynthesis of A. truncatum leaves was seriously hindered by heavy metal stress.
To study the effect of heavy metal Cd on photosynthesis of Acer truncatum, the chlorophyll content and its net photosynthetic rate(P(subscript n)) in leaves of A. truncatum were analyzed by Cd stress treatment. The results showed that the total chlorophyll a, chlorophyll b and the total chlorophyll contents decreased significantly and leaf net photosynthetic rate(Pn) of leaves decreased with the increase of the stress concentration. Under low concentration stress, the light saturation point of A. truncatum leaves changed little, and the light saturation point of A. truncatum leaves decreased significantly under high concentration stress. The photosynthesis of A. truncatum leaves was seriously hindered by heavy metal stress.
引文
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[2]郭亚平,胡曰利.土壤-植物系统中重金属污染及植物修复技术[J].中南林学院学报,2005,25(2):59-62.
[3]王忠.植物生理学[M].北京:中国农业出版社,2000:121.
[4]徐向华.超积累植物商陆吸收累积锰机理研究[D].杭州浙江大学,2006.
[5]郭智,原海燕,奥岩松.镉胁迫对龙葵幼苗光合特性和营养元素吸收的影响[J].生态环境学报,2009,18(3):824-829.
[6]李永杰.6种城市绿化树种苗木对土壤Cu、Pb污染的生理响应及耐性评价[D].北京:北京林业大学,2010.
[7]史贵涛,陈振楼,李海雯,等.城市土壤重金属污染研究现状与趋势[J].环境监测管理与技术,2006,18(6):9-12,24.
[8]田生科.超积累东南景天(Sedum alfredii Hance)对重金属(Zn/Cd/Pb)的解毒机制[D].杭州:浙江大学,2010.
[9]孙涛,张玉秀,柴团耀.印度芥菜重金属耐性机理研究进展[J].中国生态农业学报,2011(1):222-234.
[10]孔祥生,张妙霞,郭秀璞.Cd2+毒害对玉米幼苗细胞膜透性及保护酶活性的影响[J].农业环境科学学报,1999,18(3):133-134.
[11]张磊,于燕玲,张磊.外源镉胁迫对玉米幼苗光合特性的影响[J].华北农学报,2008,23(1):101-104.
[12]刘登义,王友保.Cu、As对作物种子萌发和幼苗生长影响的研究[J].应用生态学报,2002,13(2):179-182.
[13]郎明林,张玉秀,柴团耀.植物耐重金属超富集机理研究进展[J].西北植物学报,2003(11):2020-2029.
[14]李子芳,刘惠芬,熊肖霞,等.镉胁迫对小麦种子萌发幼苗生长及生理生化特性的影响[J].农业环境科学学报,2005,24(S1):17-20.
[15]何俊瑜,任艳芳.镉胁迫对水稻种子萌发、幼苗生长和淀粉酶活性的影响[J].华北农学报,2008,23(S1):131-134.
[16]白瑞琴,晁公平,孙华,等.重金属镉胁迫对蜀葵、二月蓝种子萌发和幼苗生长的毒害效应研究[J].华北农学报,2009,24(2):134-138.