Source–sink balancing is crucial for a fruit load capacity in date palm trees. In date palm trees, coordination of suckers as sink strength with berries as source strength is very significant for economic yield production. The purpose of this study was to use the number of fruit bunches in two fruiting conditions of Off (less than 6 bunches) and On (more than 8 bunches) to identify the source-sink limitation in ‘Mazafati’ date palms with a normal fruit load (6≤bunch number≤8) to determine the optimal number of suckers, as active sinks that compete with berries, to be kept on a date palm. In this study, there were two groups, date palms with 4-5 suckers and date palms with 6-7 suckers. The results showed that the stress caused by 6-7 suckers (as compared to 4-5 suckers) limited source; reduced yield, bunch weight, fruit weight, size, and flavor; and increased fruit shedding and biennial bearing. Date palms with 6-7 suckers and a normal fruit load had a higher content of reducing sugars, a lower content of non-reducing sugars, and less starch in the organelles. They also showed higher trehalose metabolism responsive trehalose-6-phosphate synthase (TPS) and trehalose-6-phosphate phosphatases (TPP) genes expression along with lower carbon allocation sucrose-phosphate synthase (SPS1), sucrose synthase (SuSy) and invertase (INV) genes expression and enzymes activity in leaflets, which were in line with changes in yield and yield components. Therefore, the optimal number of suckers to be kept on a date palm with a normal fruit load was determined to be 4-5.

源-汇平衡对于枣椰树的果实负载能力至关重要。在枣椰树中，吸盘作为库强度与浆果作为源强度的协调对于经济产量生产非常重要。本研究的目的是使用关（少于 6 串）和开（多于 8 串）两种结果条件下的果串数来确定具有正常果实的“Mazafati”枣椰树的源库限制负载（6≤bunch number≤8）以确定吸盘的最佳数量，作为与浆果竞争的主动水槽，保持在枣椰树上。在这项研究中，有两组，4-5个吸盘的枣椰树和6-7个吸盘的枣椰树。结果表明，6-7个吸盘（与4-5个吸盘相比）产生的应力源有限；产量、束重、果实重量、大小和风味降低；并增加落果和二年生结果。具有 6-7 个吸盘和正常果实负荷的枣椰树的还原糖含量较高，非还原糖含量较低，细胞器中的淀粉含量较低。他们还表现出更高的海藻糖代谢反应性海藻糖-6-磷酸合酶。TPS ) 和 6-磷酸海藻糖磷酸酶 ( TPP ) 基因在小叶中的表达以及较低碳分配的蔗糖磷酸合酶 ( SPS1 )、蔗糖合酶( SuSy ) 和转化酶 ( INV ) 基因的表达和酶活性符合产量和产量成分的变化。因此，在具有正常果实负荷的枣椰树上保持的最佳吸盘数量被确定为 4-5。