水稻的营养器官通过改变镉的化学形式并增加钙与锰的比例来减轻镉的毒性。,Ecotoxicology and Environmental Safety

当前位置： X-MOL 学术 › Ecotox. Environ. Saf. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

水稻的营养器官通过改变镉的化学形式并增加钙与锰的比例来减轻镉的毒性。
Ecotoxicology and Environmental Safety ( IF 6.2 ) Pub Date : 2019-09-06 , DOI: 10.1016/j.ecoenv.2019.109640
Wei-Jie Xue ₁ , Chang-Bo Zhang ₁ , Pei-Pei Wang ₁ , Chang-Rong Wang ₁ , Yong-Chun Huang ₁ , Xin Zhang ₁ , Zhong-Qi Liu ₁

Affiliation

改变镉的化学形态是减轻水稻中镉毒性的机制之一。在这项研究中进行了田间试验，以研究水稻营养器官在自然环境中将Cd转化为不溶性化学形式的潜力。实验结果表明，水稻根中Cd的80％以上以不溶形式存在。最上面的节点优先将Cd变为不溶形式，并且通常比其他器官具有更高的不溶Cd含量。当根中总Cd低于1.8 mg kg-1时，速溶酶显示出可溶性Cd的缓慢增加趋势。但是，当根中的Cd含量超过2.8 mg kg-1时，在水chi蒲和根中不溶与可溶Cd的比例保持稳定在85:15，而在最上节和旗叶中则保持在75:25。谷物中的镉含量远低于营养器官中的镉含量，并且与速溶酶（r = 0.991 **）以及最上层结节中的可溶性镉含量密切相关。最上方节点中的可溶性Cd的迁移率远低于其他器官中的Cd。根，最上节和根茎中钙的减少和锰的增加总是伴随着可溶性镉的积累。可溶性Cd从0.05到0.1 mg kg-1的小幅增加，导致根和根中的Ca：Mn比急剧下降。当可溶性镉含量低于0.5 mg kg-1时，根部和节间的Ca：Mn比率要高于根茎。这些结果表明，营养器官具有很大的潜力将超过75％的Cd转变为不溶形式并增加Ca：

"点击查看英文标题和摘要"

Rice vegetative organs alleviate cadmium toxicity by altering the chemical forms of cadmium and increasing the ratio of calcium to manganese.

Altering Cd chemical form is one of the mechanisms to alleviate Cd toxicity in rice plant. Field experiments were carried out in this study to investigate the potential of rice vegetative organs in altering Cd into insoluble chemical forms in the natural environment. Experimental results showed that more than 80% of Cd in rice roots existed in the insoluble forms. Uppermost nodes altered Cd into insoluble form preferentially and generally had higher content of insoluble Cd than other organs. Rachises displayed a slow increasing trend in soluble Cd when total Cd in roots was less than 1.8 mg kg-1. However, when Cd content in roots exceeded 2.8 mg kg-1, the ratio of insoluble to soluble Cd remained stable at 85:15 in rachises and roots, and at 75:25 in uppermost nodes and flag leaves. Cd concentration in grains was greatly lower than that in vegetative organs, and closely correlated with the content of soluble Cd in rachises (r = 0.991**) as well as in uppermost nodes. Soluble Cd in the uppermost nodes displayed a much lower mobility than that in other organs. Accumulation of soluble Cd was always companied by decrease of Ca and increase of Mn in roots, uppermost nodes and rachises. A small increase of soluble Cd from 0.05 to 0.1 mg kg-1 caused a sharp decline of Ca:Mn ratio in roots and rachises. Roots and nodes had much higher Ca:Mn ratio than rachises when soluble Cd was less than 0.5 mg kg-1 in them. These results indicate that vegetative organs have a great potential to alter more than 75% Cd into insoluble forms and increasing Ca:Mn ratio may be another way to alleviate Cd toxicity by establishing new ionic homeostasis in rice plants.

更新日期：2019-09-06

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南