Abstract
Flooding is one of the major abiotic stresses for vegetable production in Florida. Hydroponic and pot trials were conducted with snap bean to evaluate the effects of oxygen fertilization on the biochemical and physiological status of flooded snap bean plants. There were three treatments in the hydroponic trials were: (1) flooded (control), (2) bubble aeration with ambient air, and (3) hydrogen peroxide (H2O2) applied at the beginning of the trial. Plant health was evaluated by determining nitrogen (N) and phosphorus (P) uptake rates. The greenhouse pot trials were used to quantify the effects of three different application rates of solid oxygen fertilizers as calcium peroxide (CaO2) and magnesium peroxide (MgO2). The results showed that plant N and P uptake rates were significantly greater (p < 0.05) with H2O2 than without H2O2. The N uptake rates with H2O2 were like that of those with bubbling. The uptake rate of NH4+ was significantly greater than that of NO3− with the bubbling and H2O2 conditions, but the uptake rate of NO3− was significantly greater than that of NH4+ in the flooding condition. The plant height, leaf greenness, shoot biomass, and yield were all significantly greater with CaO2 or MgO2 than without either solid oxygen fertilizer. The minimum damage of flooded snap bean was found with 2 g CaO2 or 4 g MgO2 per pot. These results indicated that oxygen fertilization may potentially improve yield of flooded snap bean plants.
Highlights
Flooding is one of the major abiotic stresses for vegetable production in Florida
In the hydroponic trial 1–1, “flooding” is defined as plants grown in a solution that receives neither aeration nor application of H2O2
Phosphorus showed a similar trend as N O3−; there was no significant difference between the H 2O2 and aeration treatments, but the flooding control had significantly lower P uptake rate (Fig. 2) than each of the H2O2 and aeration treatments
Summary
Flooding is one of the major abiotic stresses for vegetable production in Florida. Hydroponic and pot trials were conducted with snap bean to evaluate the effects of oxygen fertilization on the biochemical and physiological status of flooded snap bean plants. The minimum damage of flooded snap bean was found with 2 g CaO2 or 4 g MgO2 per pot These results indicated that oxygen fertilization may potentially improve yield of flooded snap bean plants. Snap bean plants in flooded fields receive insufficient bioavailable O2 for normal root metabolism and suffer from waterlogging damage. In the Krebs cycle, due to the lack of bioavailable O2 as the final electron acceptor, the intermediates build-up, NAD(P)+ levels decrease, pyruvate accumulates, and ATP concentrations decline These changes negatively affect plant metabolism, including uptake of nutrients such as nitrogen (N) and phosphorus (P) and their a ssimilation[3,8]. Oxygen fertilization of the root zone is a potential method to mitigate the damage from flooding stress.
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