Chinese Journal OF Rice Science

Chinese Journal OF Rice Science >

2009 , Vol. 23 >Issue 5: 503 - 508

DOI: https://doi.org/10.3969/j.issn.10017216.2009.05.09

研究报告

Border Cells Alleviating Ferrous Toxicity in Rice Root Tips

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  • 1Key Laboratory of Botany, Zhejiang Normal University, Jinhua 321004, China; 2Quzhou College, Quzhou 324000, China; 3Zhejiang Zhenhai Middle School, Ningbo 315200, China; *Corresponding author, E-mail: sky79@zjnu.cn

Received date: 1900-01-01

  Revised date: 1900-01-01

  Online published: 2009-09-10

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Abstract

A Fe2+ tolerant rice variety （Xieyou 9308） and a Fe2+ sensitive variety (IR64) screened from 20 rice varieties were used to study the function of border cells in alleviating ferrous toxicity in rice root tips. The relative elongation rates, water content, activities of peroxidase (POD), superoxide dismutase (SOD), catalase (CAT) and content of Fe in rice root were measured at 0 (CK) and 200 μmol/L Fe2+ for 6 h, 12 h and 24 h respectively, under static culture (to maintain border cells adhered to the root tips) and shaking culture (to remove border cells from root tips completely). The results showed that the relative elongation rates and water content of rice root were reduced by ferrous iron, especially under shaking culture. With the increase of Fe2+ treatment time, the relative elongation rates and water content of rice root declined. At the same time, POD, SOD and CAT activities decreased in 200 mg/L Fe2+ treatment except the POD activity of Xieyou 9308 under the static culture. The restraining rates of POD, SOD and CAT activities were higher in rice root under the shaking culture. The content of Fe in rice root increased heavily and had a significant difference between CK and Fe+ stress treatment group. The content of Fe in section of rice root from 0-2 mm to 8-10 mm was increased gradually under the static culture, but had no significant difference in rice root under the shaking culture except the section of 8-10 mm rice root. These results indicate that root border cells play a significant role in resistance to ferrous toxicity of rice.

Key words： rice; border cell; ferrous toxicity; peroxidase; superoxide dismutase; catalase; root

Cite this article

SONG Jin-min,LIU Peng,XU Gen-di,CAI Miao-zhen,ZHANG Yi,CAI Hui-shu . Border Cells Alleviating Ferrous Toxicity in Rice Root Tips [J]. Chinese Journal OF Rice Science, 2009 , 23(5) : 503 -508 . DOI: 10.3969/j.issn.10017216.2009.05.09

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