In this study, we have evaluated the role of karrikin (KAR¹) against the absorption and translocation of a persistent organic pollutant (POP), 2,4,4’-Tribromodiphenyl ether (BDE-28) in plants, in the presence of two other stressors, cadmium (Cd) and high temperature. Furthermore, it correlates the physiological damages of Brassica alboglabra with the three stresssors separately. The results revealed that the post-germination application of KAR¹ successfully augmented the growth (200%) and pertinent physiochemical parameters of B. alboglabra. KAR¹ hindered air absorption of BDE-28 in plant tissues, and reduced its translocation coefficient (TF). Moreover, BDE-28 was the most negatively correlated (−0.9) stressor with chlorophyll contents, while the maximum mitigation by KAR¹ was also achieved agaist BDE-28. The effect of temperature was more severe on soluble sugars (0.51), antioxidative machinery (−0.43), and osmoregulators (0.24). Cd exhibited a stronger inverse interrelation with the enzymatic antioxidant cascade. Application of KAR¹ mitigated the deleterious effects of Cd and temperature stress on plant physiological parameters along with reduced aero-concentration factor, TF, and metal tolerance index. The phytohormone reduced lipid peroxidation by decreasing synthesis of ROS and persuading its breakdown. The stability of cellular membranes was perhaps due to the commotion of KAR¹ as a growth-promoting phytohormone. In the same way, KAR¹ supplementation augmented the membrane stability index, antioxidant defense factors, and removal efficiency of the pollutants. Consequently, the exogenously applied KAR¹ can efficiently alleviate Cd stress, heat stress, and POP toxicity.

在这项研究中，我们评估了karrikin（KAR ¹）对持久性有机污染物（POP），2,4,4'-三溴二苯醚（BDE - 28）在植物体内的吸收和转运的作用。另外两个压力源是镉和高温。此外，它还把小白菜的生理损伤与三个应激源相关联。结果表明，KAR ¹的发芽后应用成功地促进了白玻尿杆菌的生长（200％）和相关的理化参数。KAR ¹阻碍了BDE-28在植物组织中的空气吸收，并降低了其易位系数（TF）。此外，BDE-28是与叶绿素含量最负相关（-0.9）的应激源，而反对KDE ¹的最大缓解作用也是针对BDE-28。温度对可溶性糖（0.51），抗氧化机制（-0.43）和渗透调节剂（0.24）的影响更为严重。镉与酶抗氧化剂级联反应表现出更强的逆相关性。KAR ^1的应用减轻了Cd和温度胁迫对植物生理参数的有害影响，同时降低了空气浓度因子，TF和金属耐受指数。植物激素通过减少ROS的合成并说服其分解来减少脂质过氧化。细胞膜的稳定性可能是由于KAR ¹作为促进生长的植物激素而引起的。同样地，补充KAR ^1可提高膜的稳定性指数，抗氧化防御因子和污染物的去除效率。因此，外源施用的KAR ¹可以有效地减轻Cd胁迫，热胁迫和POP毒性。