Root hypoxia causes oxidative damage on photosynthetic apparatus and interacts with light stress to trigger abscission of lower position leaves in Capsicum

Goto, Keita; Yabuta, Shin; Tamaru, Shotaro; Ssenyonga, Peter; Emanuel, Bore; Katsuhama, Naoya; Sakagami, Jun‐Ichi

doi:10.1016/j.scienta.2022.111337

Cited by 11 publications

(1 citation statement)

References 64 publications

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“…As our sampling took place in the morning hours, the decreased DO values during the hottest part of the day in HS, CE, AN and ANC might have been overlooked. Hypoxic conditions in the root zone reduce plant water uptake [36] and could, therefore, be a reason for the higher dry matter content relative to that of fresh matter observed in the CE compared with the CEO line. In the second experiment, a lack of oxygen in the nutrient solutions can be ruled out due to the higher DO values measured and lower temperatures.…”

Section: Drymentioning

confidence: 99%

Growth of Lettuce in Hydroponics Fed with Aerobic- and Anaerobic–Aerobic-Treated Domestic Wastewater

Germer,

Brandt,

Rasche

et al. 2023

Agriculture

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Reusing water and nutrients from municipal wastewater can conserve resources and reduce wastewater treatment costs. In this study, the suitability of different qualities of treated wastewater for plant production in a hydroponic flow-through system was investigated. Lettuce (Lactuca sativa L.) was grown in hydroponic lines fed with treated wastewater, i.e., conventional effluent from aerobic wastewater treatment by the activated sludge process (CE), ozonised CE (CEO), anaerobically pre-treated and nitrified wastewater (AN) and biological activated carbon filtered AN (ANC) in comparison with a modified Hoagland nutrient solution. In CEO, AN and ANC, the lettuce reached a similar weight and elemental composition as that in HS. The low N and P concentrations in CE and CEO were quickly depleted, resulting in limited plant development at the ends of these lines. The lower water content in the CE shoots was probably related to hypoxia that occurred at higher temperatures. In the CEO line, this condition did not arise due to the constant decay of O3. At lower temperatures, the CEO shoot dry weight was 90% higher than that in CE. This was possibly an effect of residual ozone and/or oxygen supersaturation. AN produced the highest yield, while carbon filtration lowered the content of cations in ANC, inducing deficiency of Fe > Mn > Cu > Zn > K. Coupling wastewater treatment with hydroponics allows for efficient nutrient recovery, and thus could reduce the energy and reactor volume needed for N and P elimination.

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Section: Drymentioning

confidence: 99%