摘要： 为了研究Pb在芋主要产品器官中的富集及生理响应规律,以芋主栽品种8520为试材,采用土壤盆栽方式进行不同浓度Pb²⁺胁迫处理,分析芋不同器官Pb累积量的差异及生理指标的变化规律。结果表明:不同器官中Pb的累积量与土壤中Pb²⁺的浓度呈极显著正相关。芋植株中较易富集Pb的器官是球茎,其次为叶片和叶柄。低浓度Pb²⁺胁迫(100 mg/kg)诱导芋不同器官中的3种抗氧化酶活性(SOD、POD和CAT)升高,随着胁迫浓度逐渐提高到2 000 mg/kg,除叶片和叶柄的POD和CAT活性仍呈上升趋势外,其他酶活性开始波动下降。球茎、叶柄和叶片的Pro含量和MDA含量随着胁迫浓度的提高呈现先上升后下降的趋势,大多在Pb²⁺浓度为1 000 mg/kg时达到最大值。

关键词: 芋, 铅胁迫, SOD, POD, CAT, MDA, Pro

Abstract: In order to study Pb absorption law and physiological index variation trend in main product organs of taro,taking the taro variety 8520 as test materials,plants grown in soils through pot experiment were treated with different concentrations of Pb²⁺,and the differences of Pb accumulation,changes of some physiological indexes in different organs of taro were analyzed.The results showed that a highly significant positive correlation was observed between the Pb accumulation in different organs and the Pb²⁺ concentration in soil,and bulbs were easier to absorb Pb followed by leaves and petioles in taro.Compared with control,the activity of three antioxidant enzymes (SOD,POD and CAT) increased under low Pb²⁺ concentration (100 mg/kg) treatment,then the activity of POD and CAT in leaves and petioles were still on the rise,but other enzyme activities showed the trend of decline as the concentration of Pb²⁺ gradually increased to 2 000 mg/kg.The proline and MDA content of three organs (bulbs,petioles and leaves) expressed a downward trend after the first rise with increasing Pb²⁺ concentration,and mostly reached the maximum when the Pb²⁺concentration was 1 000 mg/kg.

Key words: Taro, Pb stress, SOD, POD, CAT, MDA, Pro

中图分类号: 

• S143.7