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In this study, seven watermelon (Citrullus lanatus) cultivars were tested in solution culture experiment with limiting and ample phosphorus (P) supply to evaluate P uptake and utilization of watermelon under low P stress. Different genotypes showed considerable diversity in terms of biomass accumulation, P uptake, P utilization, root morphological parameters and photosynthetic parameters under low P stress. At low P supply, genotype XN8 and ZCHY were clearly superior to other genotypes in terms of total dry matter yield. The genotype ZJ has the highest P uptake ability, while the genotype XN8 has the highest P efficiency ratio and P utilization efficiency among the seven genotypes under low P stress. The P uptake ability of these genotypes was related significantly and positively to root morphological parameters and photosynthesis parameters under low P stress, the P utilization efficiency showed significant and positive correlation with total dry matter. Results showed existence of genetic differences am...