| 水稻镉耐性差异及镉低积累种质资源的筛选 |
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| 引用本文： | 张锡洲,张洪江,李廷轩,余海英.水稻镉耐性差异及镉低积累种质资源的筛选[J].中国生态农业学报,2013,21(11):1434-1440. |
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| 作者姓名： | 张锡洲 张洪江 李廷轩 余海英 |
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| 作者单位： | 四川农业大学资源环境学院 温江 611130;四川农业大学资源环境学院 温江 611130;四川农业大学资源环境学院 温江 611130;四川农业大学资源环境学院 温江 611130 |
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| 基金项目： | 国家科技支撑计划项目(2008BAD98B03)和四川省科技厅应用基础项目(2010JY0083)资助 |
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| 摘 要： | 比较水稻亲本材料的镉耐性差异, 筛选镉低积累水稻种质资源, 为水稻镉安全品种(Cd-safe cultivars, CSCs)的培育提供遗传材料。以收集的具有明显遗传差异的145种水稻亲本材料为研究对象, 通过水培试验, 研究水稻植株生长性状和镉积累特征, 比较不同材料的镉耐性和镉积累差异, 并以耐性指数和镉含量为指标, 筛选镉低积累种质资源。结果表明: (1)在镉胁迫条件下, 水稻生物量和株高受到不同程度的抑制, 根长和根冠比呈不同程度增加。(2)恢复系各材料间镉含量和积累量最大值分别为最小值的2.79倍和6.45倍, 保持系各材料间镉含量和积累量最大值分别为最小值的2.00倍和2.98倍。(3)根据耐性指数差异将恢复系和保持系各分成耐性不同的5类, 并将耐性较强材料进行镉积累差异分类, 得到恢复系镉低积累种质资源13种, 分别是"MR183"、"MR86"、"R047"、"R364"、"泸恢602"、"泸恢615"、"泸恢17"、"GR548/M63//527_2"、"R18"、"成恢838"、"GR548/M63//M63_5"、"GRL17/IRBN95-199_3"和"GRL17/ATTP//L17_3"; 保持系镉低积累种质资源2种, 分别是"玉香B"和"D62B"。(4)镉耐性较强材料中, 高积累材料的镉含量和镉积累量表现为恢复系中分别为低积累材料的1.97倍和2.03倍, 保持系中分别为低积累材料的1.43倍和1.40倍; 镉含量和镉积累量在两系的低积累材料间无明显差异。筛选镉低积累材料培育镉安全品种将成为解决镉安全威胁的关键。
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| 关 键 词： | 水稻 恢复系 保持系 耐性指数 镉积累量 |
| 收稿时间： | 2013/5/14 0:00:00 |
| 修稿时间： | 7/5/2013 12:00:00 AM |
Differences in Cd-tolerance of rice and screening for Cd low-accumulation rice germplasm resources |
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| ZHANG Xi-Zhou,ZHANG Hong-Jiang,LI Ting-Xuan and YU Hai-Ying.Differences in Cd-tolerance of rice and screening for Cd low-accumulation rice germplasm resources[J].Chinese Journal of Eco-Agriculture,2013,21(11):1434-1440. |
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| Authors: | ZHANG Xi-Zhou ZHANG Hong-Jiang LI Ting-Xuan and YU Hai-Ying |
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| Institution: | College of Resources and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, China;College of Resources and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, China;College of Resources and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, China;College of Resources and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, China |
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| Abstract: | To develop genetic materials for breeding Cd-safe rice cultivars, the difference in Cd tolerance among rice parent materials were compared, and low Cd accumulation rice germplasms identified. The characteristics of growth and Cd accumulation of 145 rice parent materials were studied by using hydroponic method. Rice germplasms with low Cd accumulation were also identified based on Cd tolerance indices and Cd concentration. The results indicated that while dry weight (DW) and plant height (PH) of tested rice materials were inhibited on different extents under the stress of Cd ions, root lengths and root-to-shoot ratios were increased. Maximum Cd concentration and accumulation were 2.79 and 6.45 times the minimum of the restorer line materials, respectively. Similarity, maximum Cd concentration and accumulation were 2.00 and 2.98 times the minimum of the maintainer line materials, respectively. Based on Cd tolerance identification, the restorer line and maintainer line materials were divided into five groups, respectively. A total of 13 restorer line materials with low Cd accumulation were obtained. They were "MR183", "MR86", "R047", "R364", "Luhui 602", "Luhui 615", "Luhui 17", "GR548/M63//527_2", "R18", "Chenghui 838", "GR548/M63//M63_5", "GRL17/IRBN95-199_3" and "GRL17/ATTP//L17_3". Also an additional 2 maintainer line materials ("Yuxiang B" and "D62B") low in Cd accumulation were obtained. Among high Cd tolerant materials, maximum Cd concentration and accumulation were 1.97 and 2.03 times the minimum of the restorer line materials, respectively. Furthermore, maximum Cd concentration and accumulation were 1.43 and 1.40 times the minimum of the maintainer line materials, respectively. No significant difference was noted in Cd concentration and accumulation between the restorer and maintainer line materials. Identification Cd-safe rice germplasms and breeding Cd-safe rice cultivars were critical for Cd risk for human health. |
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| Keywords: | Rice Restorer line Maintainer line Tolerance index Cd accumulation |
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