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Transport and partitioning of phosphorus in wheat as affected by P withdrawal during flag-leaf expansion

机译：旗叶扩张过程中磷的吸收对小麦中磷的转运和分配的影响

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摘要

Increasing P-use efficiency within the plant is one of the acclimations to P-limiting conditions. In this work, we studied the effects of P withdrawal during flag-leaf expansion on sink-source relationships and P-use efficiency in two detillered wheat cultivars (Triticum aestivum L., CA9325 and JM2) under controlled conditions. The study period was divided into two phases of one month each. In the first period after withdrawing P from the medium, the rates of dry weight gain were unaffected compared with the control plant. However, the net dry matter deposition in the ear, and P remobilization within the plant were accelerated in both cultivars. In control plants and in the first period, P transported in the xylem came mainly from the roots’ current uptake in both cultivars; in the second period, however, phloem retranslocation of P from the shoot and cycling through the root contributed 86% in CA9325 and 95% in JM2 to the xylem-transported P. In the P-deficient plants of both cultivars, almost all of the P transported in the xylem was remobilized, exported from vegetative organs and recycled through the phloem. Over the entire duration of the experiment, the net dry matter deposition and P allocation to grains were not synchronous, indicating independent regulatory processes. Although withdrawing P from the medium markedly reduced the net dry weight gain of whole plants in both cultivars, the final dry weight of the grains was hardly influenced. The percentage of grain dry weight to whole plant dry weight increased from 42.5% in control plants to 44.7% in P-deficient plants in CA9325, and from 41.0% to 45.0% in JM2, and that of P increased from 24.8% to 87.7% and from 25.5% to 84.3%, respectively. The results showed that withdrawing P from the medium during flag-leaf expansion did not influence grain growth and its final P content. The possible mechanisms to regulate P redistribution and reutilization in plants are discussed.
机译：提高工厂内磷的使用效率是对磷限制条件的适应之一。在这项工作中，我们研究了在受控条件下，两个脱粒小麦品种（普通小麦，CA9325和JM2）旗叶扩展过程中磷的吸收对库源关系和磷利用效率的影响。研究期分为两个阶段，每个阶段一个月。从培养基中抽出磷后的第一阶段，与对照植物相比，干重增加率没有受到影响。然而，两个品种的穗中净干物质沉积和植株中磷的迁移都加快了。在对照植物中和第一时期，木质部中转运的磷主要来自两个品种根系当前的吸收。然而，在第二个时期，韧皮部P的重新定位以及从根部循环到根部循环的P中，CA9325中的86％和JM2中的95％贡献给了木质部转运的P。在两个品种的P缺乏植物中，几乎所有在木质部中运输的磷被转移，从营养器官中输出并通过韧皮部循环利用。在整个实验过程中，净干物质沉积和籽粒中磷的分配不同步，这表明它们是独立的调节过程。尽管从培养基中提取磷显着降低了两个品种中整株植物的净干重，但几乎不影响谷物的最终干重。在CA9325中，谷物干重相对于整株干重的百分比从对照植物的42.5％增加到缺磷植物的44.7％，在JM2中从41.0％增加到45.0％，P的百分比从24.8％增加到87.7％。和分别从25.5％到84.3％。结果表明，在旗叶膨胀过程中从培养基中抽出P不会影响籽粒的生长及其最终P的含量。讨论了调节植物中磷再分配和再利用的可能机制。

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