Protective role of mucilage against Al toxicity to root apex of pea (Pisum sativum)
Protective role of mucilage against Al toxicity to root apex of pea (Pisum sativum)
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粘液对豌豆根尖铝毒的保护作用
DOI：
10.1007/s11738-011-0919-1
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发表时间：
2012-07-01
影响因子：
2.6
通讯作者：
Yu, Min
中科院分区：
文献类型：
--
作者：
Geng, Mingjian;Xu, Miaomiao;Yu, Min
胶浆对根际Al有较强的束缚作用。虽然粘液在保护豌豆根尖免受铝毒害方面的作用仍存在争议，但我们认为这可能与粘液对铝的吸附特性有关，当粘液保持完整时，Al在豌豆根尖的积累和胼胝质的诱导（豌豆）仍然较低，因此根伸长抑制比当粘液被删除铝曝光在雾文化。尺寸排阻色谱法显示高和低分子量的多糖馏分从根粘液。铝主要在高分子量多糖中检测到，其强烈结合阳离子。结果表明，高分子量多糖中的胶浆通过固定铝而保护根尖免受铝毒的伤害。
Mucilage can strongly bind Al in the rhizosphere. Although there are still debates about the role of mucilage in protection of the root apex from Al toxicity, we considered that it might be associated with the characteristics of Al adsorption in mucilage.When the mucilage was kept intact, the accumulation of Al and induction of callose in root tips of pea (Pisum sativum) remained lower; thus root elongation was less inhibited than when mucilage was removed under Al exposure in mist culture. Size exclusion chromatography showed both a high and a low molecular weight polysaccharide fraction from root mucilage. Aluminum was predominately detected in high molecular weight polysaccharides, which strongly bound cations. The results indicate that the persistence of mucilage does protect the root apex from Al toxicity by immobilizing Al in high molecular weight polysaccharides.