In this study, the variety ‘Cuibao’ was used as material. Hydroponic culture trial was conducted to investigate the effects of nitrogen (N) and magnesium (Mg) on plant growth, quality, photosynthetic characteristics, antioxidant metabolism, and endogenous hormone of Chinese kale. Three N levels (2.5, 7.5 and 22.5 mmol/L) and three Mg levels (0.5, 1.4 and 4.2 mmol/L) were applied, respectively. The experiment was laid out in a completely orthogonal design which formed a total of nine different combined treatments of N and Mg (N_2.5Mg_0.5, N_2.5Mg_1.4, N_2.5Mg_4.2, N_7.5Mg_0.5, N_7.5Mg_1.4, N_7.5Mg_4.2, N_22.5Mg_0.5, N_22.5Mg_1.4, and N_22.5Mg_4.2). As compared to other combined treatments, the N_7.5Mg_1.4 treatment obviously promoted plant weight and improved the quality. Moreover, the N_7.5Mg_1.4 treatment significantly increased catalase (CAT) activity and decreased the contents of malondialdehyde (MDA) and proline (Pro). Interestingly, the combinations of N and Mg significantly affected the homeostasis of endogenous hormones. The N_7.5Mg_1.4 treatment obviously increased the contents of growth promoting hormones indo-3-acetic acid (IAA) and zeatin (ZT) and reduced the contents of growth inhibitory hormone abscisic acid (ABA), increased the ratios of IAA/ABA, gibberellin acid (GA₃)/ABA and ZT/ABA. These results revealed that the reasonable combined treatment of N and Mg effectively improved the photosynthetic characteristics, and the homeostasis of antioxidant metabolism and endogenous hormones, which resulted in regulating the plant growth and increasing plant fresh weight of Chinese kale.

本研究以“翠宝”品种为材料。进行了水培试验，研究了氮（N）和镁（Mg）对羽衣甘蓝植物生长、品质、光合特性、抗氧化代谢和内源激素的影响。分别应用了三个 N 水平（2.5、7.5 和 22.5 mmol/L）和三个 Mg 水平（0.5、1.4 和 4.2 mmol/L）。试验采用完全正交设计，共形成九种不同的 N 和 Mg 组合处理（N _2.5 Mg _0.5、N _2.5 Mg _1.4、N _2.5 Mg _4.2、N _7.5 Mg _0.5、N _7.5 Mg _1.4、N_7.5 Mg _4.2、N _22.5 Mg _0.5、N _22.5 Mg _1.4和 N _22.5 Mg _4.2 )。与其他组合处理相比，N _7.5 Mg _1.4处理显着提高了植株重量，提高了品质。此外，N _7.5 Mg _1.4处理显着提高了过氧化氢酶（CAT）活性，降低了丙二醛（MDA）和脯氨酸（Pro）的含量。有趣的是，N 和 Mg 的组合显着影响了内源性激素的稳态。N _7.5镁_1.4处理显着增加了生长促进激素indo-3-乙酸（IAA）和玉米素（ZT）的含量，降低了生长抑制激素脱落酸（ABA）的含量，提高了IAA/ABA、赤霉素酸（GA ₃ )/ABA 和 ZT/ABA。这些结果表明，合理的氮镁联合处理可有效改善甘蓝的光合特性、抗氧化代谢和内源激素的稳态，从而调节植物生长，增加甘蓝的植物鲜重。