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《China Rice》 2018-03
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Effects of Ferrous Toxicity on Growth of Rice and Accumulation of Some Mineral Elements in Rice Plants

ZHAO Yan;XIANG Hua;XIONG Na;HUANG Qina;LI Chunsheng;China National Rice Research Institute;  
Iron toxicity is a major nutrient disorder affecting rice, it leads to the inhibition of plant growth and affects the yield and quality of rice. Therefore,understanding the genetic and physiological mechanisms associated with iron toxicity tolerance of rice is crucial in adaptive breeding. In this study, an experiment was conducted to study the effects of high iron stress on growth and nutrient elements in 10 kinds of genotypes rice with different iron tolerance plants, to understand the growth of different genotypes rice and effect of Zn, Mn, P, K, Mg, Ca mineral elements accumulation under the ferrous toxicity.The results showed that high iron stress significantly inhibited plant height, root length, dry weight of the plant(shoots and roots)in all the genotypes rice. Under excessive ferrous stress, chlorophyll content decreased in the leaves, SOD, CAT activities and MDA content in leaves were apparent higher than in root.Moreover, the iron content in iron plaque, roots and shoots remarkably increased, while other nutrients element in roots and shoots significantly decreased. In conclusion, Zn, Mn, P, K, Mg and Ca nutrients elements of all the genotypes rice were much lower than normal iron plants in shoots under high Fe~(2+) concentration treatment, so the iron toxicity caused serious nutrition deficiencies in rice plants and affected the normal growth, and further influence the production and quality of rice. In summary, ferrous toxicity causes the other nutriment element lack in rice plants and then affect its growth and development, this is the important physiological mechanism of iron toxicity.
【Fund】: 国家自然科学基金(31571616 31070243);; 农业部公益性行业(农业)科研专项(201403015);; 中国农业科学院协同创新工程项目(CAAS-XTCX2016018);; 绿色性状基因聚合与种质创新(2014AA10A603)
【CateGory Index】: S511
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