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首页> 外文期刊>Science China Life Sciences >The role of maize root size in phosphorus uptake and productivity of maize/faba bean and maize/wheat intercropping systems
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The role of maize root size in phosphorus uptake and productivity of maize/faba bean and maize/wheat intercropping systems

机译：玉米根系大小在玉米/黄豆和玉米/小麦间作系统中磷吸收和生产力中的作用

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Interspecific root/rhizosphere interactions affect phosphorus (P) uptake and the productivity of maize/faba bean and maize/wheat intercropping systems. The aim of these experiments was to determine whether manipulation of maize root growth could improve the productivity of the two intercropping systems. Two near isogenic maize hybrids (the larger-rooted T149 and smaller-rooted T222) were intercropped with faba bean and wheat, under conditions of high- and low-P availability. The larger-rooted T149 showed greater competitive ability than the smaller-rooted T222 in both maize/faba bean and maize/wheat intercropping systems. The higher competitive ability of T149 improved the productivity of the maize/faba bean intercropping system in P-sufficient conditions. In maize/wheat intercropping systems, root growth, shoot biomass, and P uptake of maize were inhibited by wheat, regardless of the P-supply. Compared with T222, the larger-rooted T149 suffered less in the intercropping systems. The total biomass of the maize/wheat intercropping system was higher for wheat/T149 than for wheat/T222 under low-P conditions. These data suggested that genetic improvement of maize root size could enhance maize growth and its ability to compete for P resources in maize/faba bean and maize/wheat intercropping systems. In addition, depending on the P availability, larger maize roots could increase the productivity of intercropping systems.
机译：种间根/根际相互作用会影响磷（P）的吸收以及玉米/蚕豆和玉米/小麦间作系统的生产力。这些实验的目的是确定操纵玉米根系生长是否可以提高两个间作系统的生产力。在高磷和低磷条件下，将两个近等基因玉米杂交种（大根T149和小根T222）与蚕豆和小麦间作。在玉米/蚕豆和玉米/小麦间作系统中，大根的T149表现出比小根的T222更高的竞争能力。在充足的P条件下，T149的较高竞争能力提高了玉米/蚕豆间作系统的生产率。在玉米/小麦间作系统中，无论磷供应如何，小麦都抑制了玉米的根系生长，枝条生物量和磷的吸收。与T222相比，根系较大的T149在间作系统中受害较少。在低磷条件下，小麦/ T149玉米/小麦间作系统的总生物量高于小麦/ T222。这些数据表明，玉米根系大小的遗传改良可以增强玉米的生长及其在玉米/蚕豆和玉米/小麦间作系统中竞争磷资源的能力。另外，根据磷的有效性，更大的玉米根系可以提高间作系统的生产力。

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