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作 者 ：左元梅;刘永秀;张福锁

期 刊 ：植物营养与肥料学报 2002年 8卷 4期 页码：462-466

关键词：铁；根瘤发育；固氮酶；花生；

Keywords:iron nutrition, nodule development, nitrogenase activity, peanut,

摘 要 ：通过营养液培养试验研究了铁对花生根瘤生长发育和功能的影响。结果表明,铁营养能够明显地提高花生地上部含氮量和总吸氮量。与对照相比,介质中供铁浓度为80μmol/L时地上部含氮量和总吸氮量分别提高了2.0%和11.7%,表明铁直接参与了固氮过程;当铁浓度在0～80μmol/L范围时,铁对根瘤起始点数量没有影响,而对可见根瘤数、根瘤重量和固氮酶活性影响较大。与对照相比,铁浓度为80μmol/L时可见根瘤数和根瘤重量分别提高了194%和87%,都达到极显著水平。单株花生固氮酶活性和单位根瘤固氮酶活性分别提高了126%和10%。这表明铁营养主要是影响花生根瘤的生长发育,进而影响其根瘤的固氮功能。

Abstract:The effects of the iron nutrition on nodule development and nitrogenfixing functions of peanut were studied in nutrient solution culture experiment. The major findings were summarized as follows: In nutrient solution culture with a supply of 80μmol/L Fe (EDTAFe ), the N content and N uptake of peanut shoot have increased by 2.0 % and 11.7% as compared with control, respectively. The results showed that iron was involved in nitrogenfixing process directly. When the supply of EDTAFe was of the range of 0～80μmol/L, iron had great effects on excisable nodule, nodule dry weight and nitrogenase activity, but had no effect on number of nodule initials. The excisable nodule number and nodule dry weight had increased by 194% and 87% as compared with control, respectively, and the nitrogenase activity of per plant and special nitrogenase activity of peanut had increased 126% and 10%. The results showed that iron nutrition had important effects on nodule development first, and then had great effects on nitrogenfixation functions of peanut nodule.

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