铝胁迫下小麦根细胞壁多糖组分含量的变化与其耐铝性的关系

被引：16

作者：

林咸永

唐剑锋

李刚

章永松

机构：

[1] 浙江大学环资学院教育部环境修复与生态健康重点实验室

来源：

浙江大学学报(农业与生命科学版) | 2005年 / 06期

关键词：

铝毒; 细胞壁; 果胶; 根伸长; 小麦;

D O I：

暂无

中图分类号：

S512.1 [小麦];

学科分类号：

0901 ;

摘要：

以2个小麦基因型辐84系(敏感)和西矮麦1号(耐性)为材料,研究了在铝胁迫下根系的反应及小麦根尖不同部位细胞壁多糖含量的变化.结果表明,30μmol/L AlCl3处理24 h,小麦根系伸长受到了明显的抑制,但辐84系受抑制程度更为明显.小麦根系0～10 mm根段的铝含量显著高于10～20 mm根段,且辐84系0～10 mm根段的铝含量是西矮麦1号的1.3倍.铝处理后,小麦根尖0～10 mm根段细胞壁果胶糖醛酸含量提高,辐84系提高幅度尤为明显,且无铝对照和铝处理下,辐84系根尖0～10 mm根段细胞壁果胶糖醛酸含量均显著高于西矮麦1号,但小麦根尖细胞壁果胶总糖含量受铝影响较小.铝处理后,小麦根尖10～20 mm根段细胞壁半纤维素和纤维素糖醛酸、及总糖含量无明显变化,但在根尖0～10 mm根段,小麦细胞壁半纤维素1、半纤维素2及纤维素中糖醛酸和总糖含量提高,且敏感基因型辐84系提高幅度要大于耐性基因型西矮麦1号.上述结果表明,小麦敏感基因型根尖细胞壁果胶、半纤维素和纤维素含量较高且在铝胁迫下提高幅度较大,导致根尖铝积累量以及细胞壁的厚度和刚性增加,进而降低了细胞壁伸展性和根细胞的伸长速率,可能是其根系伸长受铝抑制程度较高的主要原因.

引用

页码：724 / 730

页数：7

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