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生态学杂志 ›› 2010, Vol. 29 ›› Issue (04): 821-825.

• 研究简报 • 上一篇    下一篇

热带地区不同水稻品种对土壤镉胁迫的生理生化响应

李福燕1,2,李许明3,赵雄1,2,杨帆1,2,张宇1,2,漆智平2   

  1. 1海南大学农学院| 海南儋州 571737; 2中国热带农业科学院热带作物品种资源研究所| 海南儋州 571737; 3海南省国土资源环境厅信息中心| 海口 570203
  • 出版日期:2010-04-09 发布日期:2010-04-09

Physiological and biochemical responses of different rice cultivars to cadmium stress in tropical region of China.

LI Fu-yan1,2, LI Xu-ming3, ZHAO Xiong1,2, YANG Fan1,2, ZHANG Yu1,2, QI Zhi-ping2   

  1. 1Hainan University, Danzhou 571737, Hainan, China|2Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, Hainan, China|3Information Center Department of Land Environment and Resources, Haikou 570203, China
  • Online:2010-04-09 Published:2010-04-09

摘要: 以热带地区主栽品种“博优225”和“矮糯”为材料,采用盆栽试验研究了不同水稻品种对土壤外源重金属Cd胁迫的耐性机理。结果表明:在各浓度镉胁迫下,2个品种水稻都是根累积的镉含量要高于茎叶和稻壳、糙米,即根>茎叶>稻壳>糙米;随着镉胁迫浓度的增加,细胞膜受损的伤害程度越大,“矮糯”质膜透性略高于“博优225”;随着Cd浓度的升高,水稻叶片丙二醛(MDA)、脯氨酸含量逐渐增加,且“博优225”的增加幅度明显大于“矮糯”,超氧化物歧化酶(SOD)和过氧化物酶(POD)活性均呈上升趋势,且“博优225”明显高于“矮糯”;过氧化氢酶(CAT)活性呈下降趋势;表明同样条件下“博优225”受Cd毒害更严重。

关键词: 玉米残体, 氮素转化, 土壤微生物氮, 硝态氮, 15N示踪

Abstract: Taking the main rice cultivars Boyou 225 and Ainuo (glutinous rice) in tropical region of China as test objects, a pot experiment was conducted to study their tolerance to three levels of soil cadmium (Cd) stress. Under the stresses of Cd, the Cd accumulation in the cultivars was in order of root > stem > rice husk > kernel. With the increasing concentration of soil Cd, cell membrane was more damaged, and the membrane permeability was slightly higher for Ainuo than for Boyou 225. The increase of soil Cd concentration increased the leaf malondialdehyde (MDA) and proline contents and SOD and POD activities, with the increment being obviously higher for Boyou 225 than for Ainuo, and decreased the catalase (CAT) activity. These results suggested that under the same Cd stress, Boyou 225 suffered Cd poison more severely than Ainuo.

Key words: Corn residues, Nitrogen transformation, Soil microbial nitrogen, Nitric nitrogen, 15N tracer