过量Fe2+对水稻生长和某些生理性状的影响

通过溶液培养研究了不同浓度氧化亚铁 (Fe2+)胁迫对水稻的生长、叶绿素含量及抗氧化酶活性的影响。结果表明 ,高浓度的Fe2+ 胁迫明显抑制水稻地上部和根系的生长、降低下位叶片叶绿素含量。当介质中Fe2+浓度过高时 ,水稻植株体内过氧化物酶 (POD)、过氧化氢酶 (CAT)和硝酸还原酶 (NR)活性明显受抑。然而 ,低浓度Fe2+胁迫时 ,上述酶活性反而提高 ,这可能是水稻抵御亚铁毒害的一种适应性机制。

Effects of excessive Fe2+ on growth and physiological characters of rice

A solution culture experiment was conducted to study the effects of different concentrations of Fe²⁺ on the growth, chlorophyll content and activities of POD, CAT and NR in rice plant. The results showed that high ferrous oxide inhibited obviously growth of shoot and root , and chlorophyll content decreased in the lower leaves along with increasing of the concentration of Fe²⁺ in the solution. The activities of POD, CAT and NR were significantly decreased under higher Fe²⁺ stress. Under lower Fe²⁺ stress, however, the activities of POD, CAT and NR increased, which might be regarded as a mechanism of rice resistance to ferrous oxide toxicity.