Nutrient management is one of the most important agricultural practices to ensure yield and fruit quality. The aim of this study was to examine the effect of N and P availability in the yield and quality of tomato fruits (Solanum lycopersicum var. Meyity), and the hormonal mechanisms underlying these effects. Fruit yield and quality (in terms of sugar accumulation and titratable acidity) at harvest, together with the hormonal profiling of developing fruits were evaluated. While low N caused a reduction of sugars, reduced P availability increased sugars and reduced acidity in fruits. These changes were not accompanied by significant reductions in yield. Enhanced trans-zeatin content at early stages of fruit development and during color break might be associated with an increased sink activity. Furthermore, jasmonic acid, salicylic acid and 1-aminocyclopropane-1-carboxylic acid (the ethylene precursor) concentrations increased at early stages of fruit development, thus suggesting a complex hormonal crosstalk induced by low P availability. In conclusion, a reduction of P availability increased tomato sugar contents, while yield was not negatively impacted. These results have implications to alleviate the depletion of natural P reserves to arrive at a more sustainable horticulture.

营养管理是确保产量和水果质量的最重要的农业实践之一。本研究的目的是研究的N的产量和番茄果实质量（效果和P可用性番茄变种Meyity），并且底层这些影响的激素机制。评估收获时的果实产量和品质（以糖分积累和可滴定的酸度计），以及发育中果实的激素谱。低氮会导致糖分的减少，而磷的利用率降低会增加糖分并降低水果的酸度。这些变化并没有伴随着产量的显着降低。增强反式水果发育早期和断色期间的玉米蛋白含量可能与下沉活性增加有关。此外，茉莉酸，水杨酸和1-氨基环丙烷-1-羧酸（乙烯前体）的浓度在果实发育的早期阶段增加，因此表明低磷的可利用性引起了复杂的激素串扰。总之，磷的有效利用量减少会增加番茄糖的含量，而产量不会受到负面影响。这些结果对减轻自然磷储量的枯竭以实现更加可持续的园艺具有影响。