Chinese Journal OF Rice Science

Chinese Journal OF Rice Science >

2010 , Vol. 24 >Issue 3: 289 - 296

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.03.012

研究报告

Responses of Seedling Growth and Antioxidase Activities of Different Zinc Efficient Rice Genotypes and Their F1 Hybrids to Zn2+ Activities

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  • Institute of Crop Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310029， China; *Corresponding author, E-mail: wangrm@zju.edu.cn

Received date: 1900-01-01

  Revised date: 1900-01-01

  Online published: 2010-05-10

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Abstract

Studying the physiological mechanism of genotypic difference in tolerance and the tolerance of F1 hybrids to low zinc stress in rice is one basic work to improve rice zinc efficiency as well as to solve the problem of rice zinc shortage. The Znefficient rice cultivars IR8192 and IR36, Zninefficient rice cultivars Ce64 and IR26, and their F1 hybrids of the crosses IR36×IR8192, IR36×IR26, and Ce64×IR26 were grown in chelatorbuffered nutrient solution at both low zinc level (pZn2+110) and normal zinc level (pZn2+9.7), respectively. The relative values of both parents and F1 rice seedlings under pZn2+110 to the ones under pZn2+9.7 in plant height, sheath height, shoot and root dry weights and zinc contents, chlorophyll content in leaves, and activities of SOD, CAT, POD, and MDA could be used as the screening index of Znefficient rice. At low zinc level, the four cultivars and their F1 hybrids showed similar trends in all the indices. However, IR8192, IR36, IR36×IR8192 had smaller decreases in chlorophyll content and activity of SOD, greater increases in activities of POD, CAT and APX, and a smaller increase in MDA content, suggesting that these rice genotypes had a stronger ability to resist low zinc stress. Under the low zinc stress, POD, CAT and APX were the main active oxygen scavenging system, while SOD protective enzyme system was firstly weakened. In the low zinc stress, except root length and APX activity, the relative values of the traits in IR36×IR8192 and IR36×IR26 showed overparent heterosis whereas Ce64×IR26 were close to midparent values, which indicates that lowzinctolerance was controlled by dominant effect and there existed duplicate effect of gene. Therefore, rice cultivars with stronger ability to resist low zinc stress could be obtained by hybridization of Znefficient parental rice.

Key words： rice (Oryza sativa); agronomic traits; antioxidant enzyme activity; heterosis; zinc

Cite this article

MENG Jie,WANG Ren-min*,WAN Ji-li,FU Li-cheng . Responses of Seedling Growth and Antioxidase Activities of Different Zinc Efficient Rice Genotypes and Their F1 Hybrids to Zn2+ Activities [J]. Chinese Journal OF Rice Science, 2010 , 24(3) : 289 -296 . DOI: 10.3969/j.issn.1001-7216.2010.03.012

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