AS  Vol.6 No.8 , August 2015
Elevated Root-Zone Temperature Modulates Growth and Quality of Hydroponically Grown Carrots
Abstract: Air and soil temperatures strongly influence the growth and quality of crops. However, in root vegetables, such as carrot, few experiments aimed at regulating growth and quality by manipulating root-zone temperature have been reported. We investigated the effect of root-zone temperatures (20&degC, 25&degC, 29&degC, and 33&degC) on carrot growth and components using a hydroponic system. High root-zone temperatures for 14 days reduced shoot and rootgrowth and water content. In contrast, total phenolic compounds and soluble-solid content increased in tap roots under high-temperature treatment. Root oxygen consumption was upregulated after 7 days under high-temperature treatment. These results suggest that high root-zone temperatures induce drought-like stress responses that modulate carrot biomass and components. High root-zone temperature treatments administered to hydroponically grown crops may be a valuable tool for improving and increasing the quality and value of crops.
Cite this paper: Sakamoto, M. and Suzuki, T. (2015) Elevated Root-Zone Temperature Modulates Growth and Quality of Hydroponically Grown Carrots. Agricultural Sciences, 6, 749-757. doi: 10.4236/as.2015.68072.

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