Efficiency of phosphorus use by melon genotypes

ABSTRACT This study aimed to evaluate the efficiency of phosphorus use with melon genotypes cultivated in a hydroponic system. Ten melon genotypes were evaluated in solutions with and without phosphorus restriction. A randomized block design in a 10 × 2 factorial scheme was used, with five replicates. The following characteristics were evaluated: leaf number, stem diameter, main branch length, root system length, root system volume, chlorophyll, root and shoot phosphorus concentration ratio, total phosphorus, root and shoot dry matter ratio, total dry matter, and phosphorus use, acquisition, and internal utilization efficiencies. The existence of variability among genotypes was verified for all evaluated characteristics, except for chlorophyll. Genotypes A-16, A-29, A-50, A-52, and Trinity were classified as efficient and responsive in the phosphorus-restricted solution and are promising for breeding studies.摘要 本研究旨在评估水培体系中种植的甜瓜基因型的磷利用效率。试验设置磷限制与非磷限制两种营养液，对10份甜瓜基因型进行评价，采用10×2因子组合的随机区组设计，设置5次重复。本研究测定的指标包括：叶片数、茎粗、主枝长度、根系长度、根系体积、叶绿素含量、根冠磷浓度比、全磷含量、根冠干物质比、总干物质量，以及磷利用效率、磷吸收效率与磷体内利用效率。经分析，除叶绿素含量外，其余所有测定指标在不同甜瓜基因型间均存在显著变异。基因型A-16、A-29、A-50、A-52与Trinity在磷限制营养液中表现出高效且响应性良好的特性，具备良好的育种研究应用潜力。