花生耐低铁性的基因型差异及其生理特性研究

通过田间试验对16个花生品种在石灰性土壤上的耐低铁性进行了评价。不同花生品种耐低铁能力存在显著的基因型差异,这种差异表现在生长过程中叶片活性铁含量、叶绿素含量以及最终的荚果产量上。溶液培养试验结果表明,根系Fe3+还原力提高是抗缺铁花生品种适应缺铁胁迫的主要机制,抗缺铁品种铁还原力高峰出现期早于铁敏感品种,且峰值远高于铁敏感品种。同时缺铁胁迫下介质pH值、新叶过氧化氢酶活性也存在显著的基因型差异。

Study on resistance to iron deficiency in peanut cultivars and physiological traits

Resistance to Fe deficiency of 16 peanut cultivars on calcareous soils were evaluated based on filed test. The results showed that there were great differences in resistance among the 16 cultivars tested, which could be represented on SPAD value, active Fe content and the ultimate pod yield. It could be attained in the solution test that the enhancement of root iron reduction capacity was the main mechanism of peanut adapting to Fe deficiency. The highly-resistant could get the peak of Fe reduction capacity earlier and the value was bigger than that of the susceptible. There were also differences in CAT activity and the pH in solution culture.