| 王智怡,李文静,邢承华,李方,王亚超,陈超发,蔡妙珍.铁膜和磷作用对水稻根尖细胞壁耐铝性的影响[J].农业环境科学学报,2019,38(12):2681-2688. |
| 铁膜和磷作用对水稻根尖细胞壁耐铝性的影响 |
| Effects of iron plaque and phosphorus on the aluminum tolerance of cell walls in rice root tips |
| 投稿时间：2019-05-15 |
| DOI：10.11654/jaes.2019-0538 |
| 中文关键词: 水稻 铝毒 铁膜 磷 细胞壁多糖 |
| 英文关键词: rice aluminum toxicity iron plaque phosphorus cell wall polysaccharides |
| 基金项目:国家自然科学基金项目（31101599）；浙江省自然科学基金项目（LY15C150004，LY18C150007）；浙江省亚热带土壤与植物营养重点研究实验室资金项目 |
|
| 摘要点击次数: 1607 |
| 全文下载次数: 1459 |
| 中文摘要: |
| 试验以铝耐性有显著差异的2个水稻基因型（菲优多系1号与红良优166）为材料，采用水培法，研究铝毒胁迫下铁膜（IP）和3个水平的磷（0、15、30 mg·L-1）对水稻生长、根尖细胞壁多糖含量的影响。结果显示，与对照相比，50 μmol·L-1铝（Al）处理显著降低水稻根系和地上部干质量，增加根尖Al含量和细胞壁果胶、半纤维素1以及半纤维素2含量，且红良优166的变化幅度大于菲优多系1号。IP+Al处理下菲优多系1号与红良优166的根系干质量分别比Al处理增加27.7%和12.3%，根尖Al的含量分别降低15.6%和33.3%，果胶含量减少了22.6%和29.9%，半纤维素1和半纤维素2的含量也显著降低，而根表Fe含量增加434.5%和265.5%。表明根表铁膜形成降低了根尖细胞壁的果胶、半纤维素1和半纤维素2的含量，减轻铝毒对水稻生长的抑制。与IP+Al处理相比，加磷处理进一步降低根尖细胞壁的果胶、半纤维素1和半纤维素2的含量，当浓度达30 mg·L-1时根伸长受抑程度明显减轻，菲优多系1号的根尖Al含量显著降低。说明磷作用于覆铁膜水稻时，磷诱导水稻根系果胶和半纤维素1、半纤维素2含量降低，进而减少了Al在根尖的积累，缓解铝毒带来的损伤。研究表明外源磷能够强化覆铁膜水稻对铝毒的缓解效应，为提高细胞壁的耐铝作用提供了依据。 |
| 英文摘要: |
| A hydroponic experiment was carried out to investigate the differences in plant growth and cell wall components in the roots of two rice genotypes that differ in terms of Al tolerance when exposed to iron plaque(IP)and phosphorus(0, 15, 30 mg·L-1)treatments. Exposure to 50 μmol·L-1 aluminum(Al)significantly decreased the biomass of roots and shoots, which was accompanied by significant increases in the Al content in the root tips, the cell wall pectin content, and the hemicellulose 1 and hemicellulose 2 contents compared with those of the control. These effects were more pronounced in Hongliangyou 166 than in Feiyouduoxi No.1. Compared with the Al treatment, the IP+Al treatment increased the root dry weight of Feiyouduoxi No.1 and Hongliangyou 166 by 27.7% and 12.3%, decreased the root tip Al content by 15.6% and 33.3%, and reduced the pectin content by 22.6% and 29.9%, respectively. The hemicellulose 1 and hemicellulose 2 contents in the root tips also significantly decreased, while the Fe content on the root surface increased by 434.5% and 265.5% for Feiyouduoxi No.1 and Hongliangyou 166, respectively, suggesting that IP formation alleviated Al-induced plant growth inhibition by decreasing the contents of cell wall pectin, hemicellulose 1 and hemicellulose 2. Accordingly, compared with the IP+Al treatment, the addition of phosphorus significantly decreased the contents of pectin, hemicellulose 1 and hemicellulose 2 in the root tips. Moreover, the relative root length increased, and the Al content decreased in the root tips with the addition of phosphorus, indicating that the effect of phosphorus on rice with iron plaque decreased the pectin and hemicellulose 1 and hemicellulose 2 contents in the rice root tips, which further reduced the accumulation of Al in the root tip. In summary, the results indicate that phosphorus addition can help alleviate the effect of IP on Al toxicity in root tips, and the results provide a technical basis for improving the cell wall Al tolerance by phosphorus incorporation. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
