摘要
采用盆栽试验,研究了不同浓度(0、5、15、40、60mg·kg-1)K2CrO4胁迫下芹菜生物量、各器官中铬累积量和叶片Vc、硝酸盐含量变化及铬胁迫对芹菜游离脯氨酸(Pro)含量等生理特性的影响。结果表明:(1)在低浓度铬(5mg·kg-1)处理下芹菜生物量无显著变化,而中、高浓度铬(40、60mg·kg-1)处理下芹菜地上部和根部干重极显著降低(P<0.01),根冠比升高,耐性指数(TI)下降。(2)不同浓度Cr6+处理下芹菜地上部和根部铬含量均极显著增加(P<0.01),根部对铬有较强的滞留作用;不同浓度处理下各器官对铬的积累量均为:根>叶>茎。(3)随着Cr6+处理浓度增加,芹菜叶片中丙二醛(MDA)、Pro、可溶性糖、硝酸盐含量呈增加趋势;叶绿素、Vc含量及根系活力呈现下降趋势;可溶性蛋白含量在低浓度下升高,在高浓度下逐渐降低。低浓度(5mg·kg-1)Cr6+处理对芹菜未产生明显影响,中、高浓度(40、60mg·kg-1)Cr6+处理对芹菜生长发育造成一定伤害。
A pot experiment was conducted to study the biomass,chromium accumulations,and other physiological characteristics of celery under different concentrations （0,5,15,40,60mg·kg -1 ） Cr6 ＋ stress. The results showed as follows：（1）There was no obvious effect on celery biomass under low concentration （5mg·kg -1） of Cr6 ＋ treatment,the biomass significantly declined when grown under medium （40mg·kg -1 ） and high Cr6 ＋ treatments（60mg·kg -1 ） （ P 0. 01）,the rising of root-shoot rate and reducing of tolerance index were simultaneously observed. （2）Exposure to Cr6 ＋ caused markedly enhancement of chromium content in both roots and aerial parts（P 0. 01）,and the retention function was found greater in roots. The accumulation amounts of Cr followed the order of root leave stem. （3） With the increasing Cr6 ＋ of concentration,celery malondialdehyde （ MDA）,proline （ Pro） content,soluble sugars content and nitrate content increased,but chlorophyll content,Vc content and roots activity decreased. In addition,soluble protein content increased under low level of 5mg·kg -1 and decreased in high Cr6 ＋ levels. It demonstrates that no significant effects was found under low concentration. （5mg·kg -1 ） of Cr6 ＋ treatments,while high concentration of Cr6 ＋ （40 and 60mg·kg -1） did harm the growth of celery.
出处
《核农学报》
CAS
CSCD
北大核心
2010年第3期639-644,655,共7页
Journal of Nuclear Agricultural Sciences
基金
农业部农业公益性行业科研专项(200803034)
关键词
芹菜
铬累积量
总吸收量
生理特性
celery （Apium graveolens）
Cr accumulation
total absorption
physiological characteristics
