Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan.
UWA School of Agriculture and Environment, The University of Western Australia, Perth, Australia.
PLoS One. 2018 Oct 17;13(10):e0205471. doi: 10.1371/journal.pone.0205471. eCollection 2018.
Production of phosphorus efficient crop cultivars can increase food productivity and decrease environmental pollution. Categorization of existing germplasm is a prerequisite to develop P efficient crop cultivars. For first experiment, 30 wheat genotypes were grown in hydroponics with two P levels (i.e., deficit, 20 μm KH2PO4 and adequate, 200 μm KH2PO4). Genotypes differed significantly for various P efficiency parameters. Two genotypes (Dirk and Bhakkar-02) showed < 25% decrease in growth at P deficiency. Genotype Seher-06 proved to be inefficient. Twelve selected genotypes based on the first experiment were sown in soil with two P levels (0 and 30 mg P kg-1) till maturity. As expected, genotypes differed for grain yield at both P levels. The efficient cultivars selected on the basis of both absolute and relative dry matter production at both P levels such as Dirk. Genotypes were grouped into three, four and nine classes on the basis of various parameters for P efficiency as proposed by different researchers. Most genotypes behaved in a similar fashion by different categorization methods and also at different P supply. The method to categorize the genotypes into three classes and plotting them into 9 classes proposed by Gill and his coworkers, is the best to differentiate the minor differences in genotypes. At least three different parameters at both P regimes should be used. The parameters may vary as per objectives of the study and/or growth conditions.
生产磷高效作物品种可以提高粮食生产力，减少环境污染。对现有种质资源进行分类是开发磷高效作物品种的前提。在第一个实验中，将 30 个小麦基因型在水培条件下用两种磷水平（即缺磷，20μm KH2PO4 和适磷，200μm KH2PO4）进行培养。基因型在各种磷效率参数上存在显著差异。两个基因型（Dirk 和 Bhakkar-02）在磷缺乏时生长减少不到 25%。基因型 Seher-06 证明是低效的。根据第一个实验，选择了 12 个基因型，在土壤中用两种磷水平（0 和 30mg P kg-1）播种，直到成熟。正如预期的那样，基因型在两种磷水平下的籽粒产量都存在差异。在两种磷水平下，根据绝对和相对干物质产量选择的高效品种，如 Dirk。根据不同研究人员提出的不同磷效率参数，将基因型分为三组、四组和九组。大多数基因型在不同的分类方法和不同的磷供应下表现出相似的行为。将基因型分为三类并按照 Gill 及其同事提出的九类进行绘图的方法，是区分基因型微小差异的最佳方法。在两种磷水平下，至少应使用三个不同的参数。参数可能因研究目的和/或生长条件而异。
