4.2 Article

Iron toxicity in field-cultivated rice: contrasting tolerance mechanisms in distinct cultivars

期刊

出版社

BRAZILIAN SOC PLANT PHYSIOLOGY
DOI: 10.1007/s40626-014-0013-3

关键词

Abiotic stress; Antioxidative enzymes; Oxidative stress; Superoxide dismutase

资金

  1. CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-Brazil)
  2. CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior-Brazil)
  3. FAPERGS (Fundacao de Apoio a Pesquisa do Estado do Rio Grande do Sul-Brazil)

向作者/读者索取更多资源

Iron toxicity is a major nutritional disorder in irrigated and rainfed waterlogged rice. To elucidate mechanisms involved in tolerance to iron toxicity, plants from one cultivar susceptible to iron toxicity (BR-IRGA409) and two tolerant cultivars (EPAGRI 108 and EPAGRI 109) were grown in the field, at an iron-toxic site and at a control site in Southern Brazil. We evaluated chlorophyll concentrations, carbonyl concentrations, iron concentrations in leaves and roots, antioxidative enzyme activities (SOD, APX, CAT, GR and DHR), concentrations of reduced and oxidized forms of ascorbate and glutathione, and gene expression profile of four SOD genes in rice leaves. Only plants from the susceptible cultivar showed symptoms of iron toxicity when grown at the iron-toxic site, accumulating high levels of iron in leaves. EPAGRI 108 plants had the lowest iron concentration in leaves and reached the highest iron concentration in the root symplast, suggesting that the capacity to safely store iron in root cells and to limit iron translocation to shoots could be a tolerance mechanism in this cultivar. Plants from the susceptible cultivar showed higher APX activity as well as higher DHA and GSSG concentrations. Plants from the EPAGRI 109 cultivar accumulated high iron levels in leaves, and showed the highest SOD, GR and DHR activities when grown in the iron-toxic site. The same cultivar also showed the highest expression of three out of four SOD genes tested. Therefore, the two tolerant cultivars seem to rely on different mechanisms to deal with iron toxicity in field conditions: limiting iron translocation to the shoot or inducing enzymes-dependent leaf tolerance.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据