摘要
为了探讨大花萱草(Hemerocallis middendorffii)在重金属Cu胁迫条件下的适应反应,揭示其抗重金属能力,设置了4个梯度Cu质量分数(100、400、800、1200 mg·kg-1)处理大花萱草植株,并测定Cu胁迫下大花萱草生长、生理和光合特性。结果表明:在相同胁迫强度下,随着胁迫时间的增加,各生理指标出现了不同变化规律。同一时间内,Cu质量分数为100 mg·kg-1时促进大花萱草的生长,大于400 mg·kg-1时抑制其生长;随着Cu质量分数的增大,过氧化物酶(POD)、超氧化物歧化酶(SOD)的活性均明显增加,但SOD活性升高后又降低;大花萱草叶片叶绿素质量分数随Cu质量分数的增加呈先增加后降低趋势,转折点出现在100 mg·kg-1处理水平上;光合速率(Pn)、蒸腾速率(Tr)均在10:00和16:00左右出现两个峰值。通过对大花萱草在不同重金属Cu胁迫条件下生长及生理特性的研究发现,大花萱草适应于质量分数小于100 mg·kg-1的Cu污染土壤的修复。
In order to investigate HemerocaUis middendorfii adaptive response in the heavy metal Cu stress, we studied its resistance to heavy metal, set up four different Cu contents （ 100, 400, 800, 1 200 mg · kg-1 ） to treat H. middendorffii, and determined its growth, physiology and photosynthetic characteristics under Cu stress. In the same stress intensity with in creasing stress time, there was different physiological variation. In the same time, when Cu content was 100 mg· kg-1, it could promoted H. middendoi growth, when Cu content was more than 400 mg · kg-1, it could inhibited 1t. middendorfii growth. With the increasing of Cu content, peroxidase （POD） and superoxide dismutase （SOD） activity increased significantly, but SOD activity increased and then decreased; H. middendorffii leaf chlorophyll content with increasing Cu content showed a decreasing trend after the first increase with the turning point of 100 mg· kg-1. Photosynthetic rate and transpiration rate appeared peak value at 10：00 am and 16：00 pm. H. middendofii could adapt to less than 100 mg· kg-1 for reme- diation in the Cu contaminated soil.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2014年第7期91-94,共4页
Journal of Northeast Forestry University
基金
吉林省科技支撑项目(20100259)
关键词
CU胁迫
大花萱草
土壤修复
生理特性
Cu stress
Hemerocallis middendofffii
Soil remediation
Physiologic characteristic
