Effects of exogenous fulvic acid treatments on synthesis and distribution of photoassimilates in apple leaves during fruit expanding period
Using 10-year-old Yanfu 3/M26/Malus robusta as the experimental material,13C isotope tracer technology was applied to foliar spray of different concentrations of fulvic acid(50 mg/L,100 mg/L,150 mg/L,200 mg/L,expressed by FA50,FA100,FA150,FA200,respectively)during the fruit expansion period,and spraying of water as the control,to study the photosynthetic parameters,assimilation capacity,photosynthetic product output and self-retention ratio,and photosynthetic product distribution characteristics in fruits and leaves.The results showed that the treatment of foliar application of 150 mg/L fulvic acid had the best performance in leaf photosynthetic performance,sorbitol and sucrose content,sorbitol 6-phosphate dehydrogenase(S6PDH)and sucrose phosphate synthase(SPS)activities compared with other treatments.Meanwhile,13C tracing results showed that the treatment of foliar application of 150 mg/L fulvic acid significantly enhanced leaves assimilation capability,increased the proportion of photosynthetic products exported,reduced the proportion of leaves self-retention,and increased fruit 13C accumulation.In conclusion,the treatment of foliar application of 150 mg/L fulvic acid on leaves enhanced photosynthesis,improved the synthesis capacity of photosynthetic products in leaves,promoted the output ratio of photosynthetic products in leaves,and facilitated the accumulation of photosynthetic products in fruits.
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