Effects of Temperature and Photoperiod on Phytotoxic Root Exudates of Cucumber (Cucumis sativus) in Hydroponic Culture

By M. Pramanik, Masayuki Nagai, T. Asao, Y. Matsui. Journal of Chemical Ecology, 2000

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Allelochemicals: sources, toxicity and microbial transformation in soil —a review (2008, background): “The synthesis and exudation of allelochemicals are enhanced by the stress conditions that plant encounters such as extreme temperature, drought and UV exposure (Rice, 1984; Pramanik et al., 2000; Inderjit and Weston, 2003).”
In the light of new greenhouse technologies: 1. Plant‐mediated effects of artificial lighting on arthropods and tritrophic interactions (2010, background): “In roots of cucumber grown in long photoperiod (14 L : 10 D) as compared to short photoperiod (10 L : 14 D), the number of organic acids and their exudation rates were higher, even to such extent that these compounds were autotoxic to cucumber (Pramanik et al., 2000).”
Soil sickness of peanuts is attributable to modifications in soil microbes induced by peanut root exudates rather than to direct allelopathy (2014, background): “Many factors may influence the composition of root exudates, including growth conditions and plant partners such as arbuscular mycorrhizal fungi, phytopathogens and Rhizobium (Pramanik et al., 2000; Badri and Vivanco, 2009; Zhang et al., 2012; Carvalhais et al., 2013).”