ABSTRACT

This study aimed to evaluate the effect of crop load on the fruit quality traits especially nutritional and nutraceutical properties of two cultivars of greenhouse tomato (Solanum lycopersicum L.) i.e. ‘Grandella’ and ‘Isabella’. The crop load treatments were: saving one fruit per truss (1F), two fruits per truss (2F), three fruits per truss (3F), and no fruit thinning (control). The results showed that decreasing crop load increased the dry matter content, glucose, fructose, and sucrose concentrations of fruits because of less competition between fruits of each truss and higher relative expression level of tomato hexose transporter genes (LeHTs). Higher transport of sugars toward fruits of 1F resulted in high secondary metabolites concentration. The high secondary metabolites concentration with high fruit load in control that has low soluble sugar availability may result from the opportunity to take advantage of the excess pool of carbon to build cost-free carbon-based secondary metabolites. A reduced crop load would be a recommended management strategy to improve greenhouse tomato quality.

摘要

本研究旨在评估作物负荷对两种温室番茄（Solanum lycopersicum L.）品种“Grandella”和“Isabella”果实品质性状的影响，尤其是营养和营养特性。作物负荷处理为：每捆留果1个（1F）、每捆2个果实（2F）、每捆3个果实（3F）、不疏果（对照）。结果表明，降低作物负荷会增加果实的干物质含量、葡萄糖、果糖和蔗糖浓度，因为每个桁架果实之间的竞争较少，番茄己糖转运蛋白基因（LeHT ）的相对表达水平较高。s)。糖向 1F 果实的较高运输导致较高的次生代谢物浓度。可溶性糖可用性低的对照中具有高水果负荷的高次生代谢物浓度可能是由于有机会利用多余的碳库来构建免费的碳基次生代谢物。减少作物负荷将是提高温室番茄质量的推荐管理策略。