Koide Roger T, Li Mingguang
Department of Biology, The Pennsylvania State University, University Park, PA 16802 USA.
New Phytol. 1990 Jan;114(1):59-74. doi: 10.1111/j.1469-8137.1990.tb00373.x.
We investigated mycorrhizal infections caused by Glomus elunicalum Becker & Gerd. in sunflower (Helianthus annuus L.) plants given small concentrations of phosphate. In pure sand given no additional phosphate, infection was only poorly developed. As phosphate availability was increased, the extent of infection also initially increased. We hypothesized that the extent of infection should be regulated by the nutritional status of the shoot. However, by performing a split-root experiment, we found that the root rather than the shoot was responsible for this regulation.
我们研究了由埃伦卡鲁姆球囊霉（Glomus elunicalum Becker & Gerd.）引起的向日葵（Helianthus annuus L.）植株的菌根感染情况，这些向日葵植株被施加了低浓度的磷酸盐。在不添加额外磷酸盐的纯沙中，感染发展不佳。随着磷酸盐可利用性的增加，感染程度最初也有所增加。我们推测感染程度应由地上部分的营养状况来调节。然而，通过进行分根实验，我们发现是根部而非地上部分负责这种调节。
