Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China.
State Key Laboratory of Oasis Ecology and Desert Environment, Urumqi, 830011, China.
BMC Plant Biol. 2018 Dec 5;18(1):334. doi: 10.1186/s12870-018-1550-8.
There are two plant phosphorus (P)-uptake pathways, namely the direct P uptake by roots and the indirect P uptake through arbuscular mycorrhizal fungi (AMF). Maximizing the efficiency of root and AMF processes associated with P acquisition by adjusting soil conditions is important for simultaneously ensuring high yields and the efficient use of available P.
A root box experiment was conducted in 2015 and 2016. The aim was to investigate the effects of different P and soil water conditions on root/mycorrhizal growth and P uptake by cotton plants. Hyphal growth was induced in well-watered soil, but decreased with increasing P concentrations. Additionally, P fertilizers regulated root length only under well-watered conditions, with the longest roots observed in response to 0.2 g PO kg. In contrast, root elongation was essentially unaffected by P fertilizers under drought conditions. And soil water in general had more significant effects on root and hyphal growth than phosphorus levels. In well-watered soil, the application of P significantly increased the cotton plant P uptake, but there were no differences between the effects of 0.2 and 1 g PO kg. So optimizing phosphorus inputs and soil water can increase cotton growth and phosphorus uptake by maximizing the efficiency of phosphorus acquisition by roots/mycorrhizae.
Soil water and P contents of 19-24% and 20-25 mg kg, respectively, simultaneously maximized root/mycorrhizal growth and P uptake by cotton plants.
植物有两种吸收磷（P）的途径，即根系直接吸收 P 和通过丛枝菌根真菌（AMF）间接吸收 P。通过调节土壤条件，最大限度地提高与 P 吸收相关的根系和 AMF 过程的效率，对于同时确保高产量和有效利用可用 P 非常重要。
2015 年和 2016 年进行了根箱实验。目的是研究不同 P 和土壤水分条件对棉花植株根系/菌根生长和 P 吸收的影响。在水分充足的土壤中诱导了菌丝生长，但随着 P 浓度的增加而减少。此外，P 肥料仅在水分充足的条件下调节根长，在 0.2 g PO kg 下观察到最长的根。相比之下，在干旱条件下，根伸长基本上不受 P 肥料的影响。通常，土壤水分对根系和菌丝生长的影响大于磷水平。在水分充足的土壤中，施用 P 显著增加了棉花植株的 P 吸收，但 0.2 和 1 g PO kg 之间的效果没有差异。因此，优化磷投入和土壤水分可以通过最大限度地提高根系/菌根对磷的获取效率来增加棉花的生长和磷的吸收。
土壤水分和 P 含量分别为 19-24%和 20-25 mg kg，同时最大限度地提高了棉花植株的根系/菌根生长和 P 吸收。
