光照强度对紫茉莉生长和镉积累的影响  

Effects of light intensities on the growth and Cd-accumulation of Mirabilis jalapa plants subjected to cadmium stress

作　　者：周合合[1] 柯世省[1] 钟永军[1] 马必利[1] 陈金定[1] 陈红辉[1] 

机构地区：[1]台州学院生命科学学院,浙江临海317000

出　　处：《生物学杂志》2009年第5期27-29,共3页Journal of Biology

基　　金：浙江省自然科学基金(Y504256);浙江省新苗人才计划(2007R40G2170047)资助项目

摘　　要：采用土培实验研究了25 mg/kg镉处理下全光照(HL)、50%全光照(ML)和10%全光照(LL)三种生长光强对紫茉莉生长、光合作用和镉积累相关指标的影响,结果表明,紫茉莉对镉具有较高的耐性,ML对紫茉莉的生长最为有利。镉胁迫下紫茉莉净光合速率和最大光化学效率降低,暗呼吸速率增高,生物量减小。特别在高光强条件下。ML植株镉积累量最大,对镉污染土壤的植物修复效果较好。Mirabilis jalapa seedlings were subjected to 25mg/kg cadmium （Cd） in soils for fifty days and synchronously cultured under full sunlight （ HL）, 50% full sunlight （ML） and 10% full sunlight （LL）, respectively. The parameters of growth, photosynthesis and Cd-accumulation were investigated. Mirabilis jalapa plants exhibited a stronger Cd-tolerance and favorable light environment of ML. The Cd-treated plants displayed a decrease in net photosynthetic rate, maximal photochemical efficiency （ Fv/Fm ） and bio- mass, and an increase in dark respiration, particularly under HL condition. Therefore, ML grown plants possessed the preferable effect of phytoremediation to Cd-contaminative soils for their higher Cd-accumulation.

关 键 词：紫茉莉 光照强度 生长 光合作用 镉积累 

分 类 号：Q945[生物学—植物学]