Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, 38040, Pakistan.
Soil and Environmental Sciences Division, Nuclear Institute of Agriculture, Tandojam, 70060, Pakistan.
Sci Rep. 2020 Mar 9;10(1):4278. doi: 10.1038/s41598-020-61147-3.
Phosphorus (P) is a non-renewable resource which may be depleted within next few decades; hence high P use efficiency is need of time. Plants have evolved an array of adaptive mechanisms to enhance external P acquisition and reprioritize internal utilization under P deficiency. Tissue specific biomass and P allocation patterns may affect the P use efficiency in plants. six rice cultivars were grown in solution culture for 20 days and then were divided into two groups to receive either adequate P or no P that were harvested at 30, 40 and 50 days. Plants were dissected into various tissues/organs. Two rice cultivars viz Super Basmati (P-inefficient) and PS-2 (P-efficient) were grown in soil with no or 50 mg P kg soil till maturity. Rice cultivars PS-2 and Basmati-2000 had higher P uptake, utilization efficiency and internal remobilization than other tested cultivars after P omission. Young leaves and roots were the major sinks while stems and mature leaves were the sources of P during P omission. In conclusion, biomass allocation and P accumulation among various tissues and P remobilization were major factors responsible for P efficiency.
磷（P）是一种不可再生资源，可能在未来几十年内耗尽；因此，提高磷的利用效率是当务之急。植物已经进化出一系列适应机制，以增强对外界磷的获取，并在磷缺乏时重新分配内部利用。组织特异性生物量和磷分配模式可能会影响植物的磷利用效率。
将 6 个水稻品种在营养液中培养 20 天，然后分为两组，一组接受充足的磷，另一组不接受磷，分别在 30、40 和 50 天收获。将植物解剖成不同的组织/器官。在没有或 50mg P kg 土壤的条件下，将两个水稻品种 viz Super Basmati（磷低效）和 PS-2（磷高效）种植在土壤中，直到成熟。与其他测试品种相比，在缺磷后，PS-2 和 Basmati-2000 这两个水稻品种具有更高的磷吸收、利用效率和内部再利用能力。在缺磷期间，幼叶和根是磷的主要吸收器官，而茎和成熟叶是磷的来源。
综上所述，生物量分配和不同组织之间的磷积累以及磷的再利用是决定磷效率的主要因素。
