不同叶面调控处理对3个早熟油菜品种苗期生长的影响研究OA

This study aimed to explore the effects of different foliar fertilizer treatments on the seedling growth of three early-maturing varieties—'Huayouza 652','Huayouza 2031',and'Fengyou 112'—of Brassica napus.The experiment was conducted with five foliar fertilizer treatments:clear water(CK),24-brassinolide(T1),organic selenium(T2),Lili Bao foliar fertilizer once(T3),and Lili Bao foliar fertilizer twice(T4).The agronomic traits and physiological and biochemical indicators before winter were determined and the field frost damage was investigated.The results showed that different treatments promoted the growth or enhanced the stress tolerance of B.napus seedlings through differentiated physiological pathways.Among them,T2 demonstrated prominent performance in promoting biomass accumulation and significantly increased the chlorophyll content of the three varieties.Compared with CK,T2 significantly increased the aboveground fresh weight and the underground fresh weight of'Huayouza 652'by 133.5％and 382.4％,respectively,while significantly decreasing the malondialdehyde(MDA)content of'Huayouza 652'and'Huayouza 2031'.T4 performed well in activating the antioxidnat defense,synergistically increasing the activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)and reducing the MDA content.Thus,T4 had the lowest frost damage index.T1 had a unique advantage in promoting photosynthetic growth,increasing the chlorophyll content of'Huayouza 652','Huayouza 2031',and'Fengyou 112'by 53.0％,55.4％,and 15.8％,respectively,compared with CK.Moreover,'Fengyou 112'achieved the highest aboveground fresh weight and underground fresh weight under T1.In conclusion,T2 was the optimal strategy to synergistically achieve rapid biomass accumulation and enhance the stress tolerance of B.napus before winter.T4 and T1 could be used as special management options to cope with low temperature stress and tap the potential of high yield,respectively.