Inal A, Gunes A, Zhang F, Cakmak I
Ankara University, Faculty of Agriculture, Department of Soil Science and Plant Nutrition, 06110 Ankara, Turkey.
Plant Physiol Biochem. 2007 May;45(5):350-6. doi: 10.1016/j.plaphy.2007.03.016. Epub 2007 Mar 14.
A greenhouse study was conducted to investigate the rhizosphere effects on iron (Fe), phosphorus (P), nitrogen (N), potassium (K), calcium (Ca), zinc (Zn), and manganese (Mn) nutrition in peanut plants (Arachis hypogaea L.) by intercropping them with maize (Zea mays L.). In addition, we studied the release of phytosiderophores and the ferric reductase activity of roots, pH and acid phosphatases in the rhizosphere and bulk soil, and the secretion of acid phosphatases in roots. Our results revealed that shoot yields of peanut and maize plants were decreased by intercropping the plants, as compared to monocultured plants. Growing peanut plants in a mixture with maize, enhanced the shoot concentrations of Fe and Zn nearly 2.5-fold in peanut, while the Mn concentrations of peanut were little affected by intercropping. In the case of maize, the shoot concentrations of Fe, Zn and Mn were not significantly affected by intercropping with peanut. Intercropping also improved the shoot K concentration of peanut and maize, while it negatively affected the Ca concentration. In the intercropping of peanut/maize, the acid phosphatase activity of the rhizosphere and bulk soil and root secreted acid phosphatases were significantly higher than that of monocultured peanut and maize. In accordance, the shoot P concentrations of peanut and maize plants were much higher when they were intercropped with peanut or maize, respectively. The rhizosphere and bulk soil pH values were not clearly affected by different cropping systems. When compared to their monoculture treatments, the secretion of phytosiderophore from roots and the root ferric reducing capacity of the roots were either not affected or increased by 2-fold by the intercropping, respectively. The results indicate the importance of intercropping systems as a promising management practice to alleviate Fe deficiency stress. Intercropping also contributes to better nutrition of plants with Zn, P and K, most probably by affecting biological and chemical process in the rhizosphere.
开展了一项温室研究，以调查间作玉米（Zea mays L.）对花生植株（Arachis hypogaea L.）根际铁（Fe）、磷（P）、氮（N）、钾（K）、钙（Ca）、锌（Zn）和锰（Mn）营养的影响。此外，我们研究了植物铁载体的释放、根的铁还原酶活性、根际和土体土壤的pH值及酸性磷酸酶，以及根中酸性磷酸酶的分泌。我们的结果显示，与单作植株相比，间作使花生和玉米植株的地上部产量降低。花生与玉米混种时，花生地上部铁和锌的浓度提高了近2.5倍，而间作对花生锰浓度的影响较小。就玉米而言，与花生间作并未显著影响其地上部铁、锌和锰的浓度。间作还提高了花生和玉米地上部的钾浓度，但对钙浓度有负面影响。在花生/玉米间作中，根际和土体土壤的酸性磷酸酶活性以及根分泌的酸性磷酸酶显著高于单作的花生和玉米。相应地，花生和玉米植株分别与花生或玉米间作时，其地上部磷浓度要高得多。不同种植系统对根际和土体土壤的pH值影响不明显。与单作处理相比，间作时根分泌植物铁载体及根的铁还原能力要么未受影响，要么分别提高了2倍。结果表明，间作系统作为一种缓解缺铁胁迫的有前景的管理措施具有重要意义。间作还可能通过影响根际的生物和化学过程，有助于改善植物对锌、磷和钾的营养状况。
