RICE SCIENCE ›› 2012, Vol. 19 ›› Issue (3): 207-212.

• Research Paper • Previous Articles     Next Articles

Involvement of Antioxidative Defense System in Rice Seedlings Exposed to Aluminum Toxicity and Phosphorus Deficiency

  1. Life Sciences Campus, Shaoxing University, Shaoxin 312000, China
  • Online:2012-09-28 Published:2012-10-15
  • Contact: GUO Tian-rong
  • Supported by:

    the Natural Science Fund of Zhejiang Province, China (Grant No. Y3100450) and the Educative Department of Zhejiang Province, China (Grant No. Z201018672).

Abstract: Plants growing in acid soils may suffer both phosphorus (P) deficiency and aluminum (Al) toxicity. Hydroponic experiments were undertaken to assess the single and combination effects of Al toxicity and low P stress on seedling growth, chlorophyll and proline contents, antioxidative response and lipid peroxidation of two rice genotypes (Yongyou 8 and Xiushui 132) differing in Al tolerance. Al toxicity and P deficiency both inhibited rice seedling growth. The development of toxic symptoms was characterized by reduced chlorophyll content, increased proline and malondialdehyde contents in both roots and leaves, and increased peroxidase and superoxide dismutase activities in roots, but decreased in leaves. The stress condition induced more severe growth inhibition and oxidative stress in Yongyou 8, and Xiushui 132 showed higher tolerance to both Al toxicity and P deficiency. P deficiency aggravated Al toxicity to plant growth and induced more severe lipid peroxidation.

Key words: aluminum toxicity, phosphorus deficiency, rice, plant growth, oxidative stress