海南野生狗牙根对镉胁迫的生理生态响应  

Effects on Ecophysiological Characteristics of Hainan Wild Bermudagrass to Cadmium Stress

作　　者：杨雨婷[1,2] 谭淑端 董方旭[1,2] 陈镔 YANG Yu-ting;TAN Shu-duan;DONG Fang-xu;CHEN Bin(College of Biological Science and Technology,Hunan Agricultural University,Hunan Changsha 410128,China;Dongting Lake Ecosystem Health in Rural Hunan Province Key Laboratory;Hunan Changsha 410128,China)

机构地区：[1]湖南农业大学生物科学技术学院,湖南长沙410128 [2]洞庭湖区农村生态系统健康湖南省重点实验室,湖南长沙410128

出　　处：《西南农业学报》2018年第10期2086-2091,共6页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金(31400339);中国博士后科学基金(2013M542113);湖南省教育厅优秀青年科学基金(15B113)

摘　　要：【目的】通过测定狗牙根的形态指标、叶绿素、丙二醛含量、保护酶活性及镉含量,探讨其对镉的耐受潜力。【方法】本文以未遭受镉污染的海南野生狗牙根为试验材料,采取盆栽法,对其施加不同浓度的外源镉(10、20、30 mg/kg)。【结果】实验发现,镉胁迫下,株高,地上、地下部分生物量,植株中镉含量,POD活性,前后期SPAD值均高于对照。镉浓度≥20 mg/kg时,促进作用最强;但对茎节长、SOD有抑制作用。镉浓度0～20 mg/kg时,镉富集系数大于转移系数,地下部分镉含量大于地上部分;而叶长、叶宽、茎基直径、MDA、CAT及中期SPAD值对镉胁迫无显著变化。【结论】镉胁迫对狗牙根生长有一定的促进作用,其镉积累量较高,狗牙根是用于重金属污染土壤修复的较好物种之一。【Objective】In the present study,tolerance to Cd was tested by morphological index,chlorophyll,MDA content,protective enzyme activity and cadmium content of Bermudagrass.【Method】Wild Bermudagrass in Hainan without cadmium pollution was used as experimental material.It was treated with different concentrations of exogenous Cd（10,20 and 30 mg/kg） via potting method.【Result】Under Cd stress,plant height,aboveground/underground biomass,Cd content in plants,POD activity and initial/end SPAD values were all higher than CK.When the Cd concentration ≥20 mg/kg,it displayed the strongest promoting effect,while it exhibited inhibition for stem length and SOD value.At the Cd concentration of 0 ～ 20 mg/kg,enrichment coefficient and underground content of Cd were higher than translocation coefficient and ground content,respectively;while there were no obvious changes for leaf length,leaf width,MDA,CAT and mid-term SPAD value under Cd stress.【Conclusion】It could be indicated that the Cd stress was beneficial for growth of bermudagrass with relatively high accumulation capacity of Cd,expressing the one potential application in soil remediation from heavy metal pollution of bermudagrass.

关 键 词：海南狗牙根 镉胁迫 抗氧化酶 镉富集与转运 

分 类 号：S688.4[农业科学—观赏园艺]