科研进展

【论文题目】Common mycorrhizal networks asymmetrically improve chickpea N and P acquisition and cause overyielding by a millet/chickpea mixture

【论文题目】普通菌根网络不对称地改善鹰嘴豆对氮、磷的吸收使混合栽培的小米和鹰嘴豆超产

【作者】Chunjie Li, Haigang Li*, Ellis Hoffland, Fusuo Zhang, Junling Zhang, Thomas W. Kuyper

【作者】李春杰，李海港，Ellis Hoffland，张福锁，张俊伶，Thomas W. Kuyper

【期刊名称和年（卷、期）】Plant and Soil 2022, 427: 279-293

【Abstract】Aim Cereal/legume intercropping often increases yield, partly because of increased nitrogen (N) and phosphorus (P) acquisition. The aim of this paper was to investigate the role of arbuscular mycorrhizal (AM) fungal common mycorrhizal networks (CMNs) in overyielding by the millet (Setaria italica L.) and chickpea (Cicer arietinum L.) mixture and to find out if the effect of a CMN depends on which of the two species was first colonized by AM fungi (AMF). Methods Microcosms with two compartments were used, separated by a 30-μm nylon mesh. Both com- partments contained either chickpea or millet, in monoculture or mixed. One or none of the two com- partments was inoculated with the AMF species Fun- neliformis mosseae. The plant in the inoculated com- partment was referred to as the donor, and the plant in the neighboring, non-inoculated compartment as the receiver. Results Inoculation in one compartment resulted in mycorrhiza formation in the other compartment, pro- viding evidence for the formation of CMNs. Inocu- lation of chickpea in the mixture increased N and P acquisition and biomass of both chickpea (donor) and millet (receiver) leading to overyielding of the mix-ture, whereas inoculation of millet increased biomass of chickpea (receiver) only, but did not increase N or P acquisition by any of the two species, and there was no overyielding. Chickpea as donor had higher num- bers of phosphate-solubilizing bacteria in its rhizo- sphere compared to chickpea as receiver. The shoot N:P ratio of chickpea as donor was lower than as receiver.Conclusion Our study demonstrated asymmetry in nutrient gains by a mixture of a cereal and a legume, dependent on which plant species was the donor or receiver. This suggests that initiating mycorrhizal networks by legumes in intercropping could be an important factor contributing to the magnitude of the intercropping effect.

【Keywords】Intercrop; Mycorrhiza; Rhizosphere; Nutrient; Overyielding