Abstract There is a high prevalence of saprophytic fungi in date fruit and date fruit products. Some of these fungi isolated from the infected plants in date palm orchards were identified as Aspergillus niger and Rhizophus oryzae. These fungi cause fruit loss during later stages of maturation and are responsible for severe post-harvest losses of date fruit. They may also deteriorate the overall health of plants. The fungal culture filtrates (FCF) from A. niger (ANFCF) and R. oryzae (ROFCF) were prepared and used as elicitors for the experimentation. These FCFs were foliar sprayed on the date palm plants in the field after the fruit set. Various quality attributes such as weight, firmness and total soluble solids and biochemical properties like total sugars, total proteins, total phenols, ascorbic acid, and antioxidant activity of fresh date fruit (khalal stage) harvested from the FCF treated and untreated plants were studied. The fruit harvested from plants treated with ROFCF showed enhanced levels of total sugar, total proteins, ascorbic acid, and DPPH scavenging activities followed by the fruit from plants treated with ANFCF in comparison to fruit collected from untreated plants. The shelf life of fruit from plants treated with ROFCF and ANFCF increased beyond 14 d at room temperature while the fruit from untreated plants started to deteriorate after 7 d from harvest. The study indicates that the use of fungal culture filtrates as elicitors can help the plant to build up its defense mechanism by elevating the activity of protective enzymes like, Peroxidase (POX), Polyphenol oxidase (PPO) and Phenylalanine ammonia lyase (PAL). It also enhances the growth of plant and improve the quality as well as increases shelf life of fruit.

中文翻译：

---

真菌培养滤液收获前叶面喷洒对喀拉勒期枣果收获后生物学的影响

摘要 枣果及枣果制品中腐生真菌的患病率很高。从枣椰园受感染植物中分离出的一些真菌被鉴定为黑曲霉和米根霉。这些真菌会在成熟后期造成果实损失，并导致枣果实在收获后严重损失。它们还可能使植物的整体健康状况恶化。制备来自黑曲霉 (ANFCF) 和米根霉 (ROFCF) 的真菌培养滤液 (FCF) 并用作实验的诱导物。这些 FCF 在坐果后叶面喷洒在田间的枣椰树上。各种质量属性，如重量、硬度和总可溶性固形物，以及总糖、总蛋白质、总酚、抗坏血酸、研究了从 FCF 处理和未处理的植物中收获的新鲜枣果（哈拉尔阶段）的抗氧化活性。与从未处理过的植物中收集的果实相比，从用 ROFCF 处理的植物中收获的果实显示出总糖、总蛋白、抗坏血酸和 DPPH 清除活性的水平提高，其次是从用 ANFCF 处理过的植物中收获的果实。在室温下，用 ROFCF 和 ANFCF 处理的植物果实的保质期超过 14 天，而未经处理植物的果实在收获后 7 天后开始变质。该研究表明，使用真菌培养物滤液作为诱导剂可以通过提高保护性酶如过氧化物酶 (POX)、多酚氧化酶 (PPO) 和苯丙氨酸解氨酶 (PAL) 的活性来帮助植物建立防御机制。