Response of Maize, Pea and Radish Roots to Allelochemical Stress

Abstract

We examined whether allelochemical stress leads to increased lipoxygenase activity in roots of sweet maize (Zea mays L. ssp. saccharata), pea (Pisum sativum L.) and radish (Raphanus sativum L. var. radicula). The lipoxygenase activity of soluble and membrane-bound fractions was assessed in roots after exposure to ferulic and p-coumaric acids. Lipid peroxidation and membrane injury were determined as indicators of stress. Increased lipoxygenase activity of both studied fractions was followed by lipid peroxidation and plasma membrane injury. The results suggest the key role of lipoxygenase in plasma membrane injury during allelochemical stress caused by administration of hydroxycinnamic acids.K Ke ey y w wo or rd ds s: : Allelopathic stress, p-coumaric acid, ferulic acid, lipid peroxidation, lipoxygenase, pea, plasma membrane injury, radish, roots, sweet maize.

Physiological and biochemical effects of Lantana camara L. allelochemicals on the seed germination of Avena sativa L.

“…The phase III of germination is more sensitive to allelochemicals, as observed by the higher levels of oxidative stress markers. Increases in the MDA levels related to phytochemical stress are also reported in lettuce (Ladhari et al 2014), soybean (Haddadchi & Gerivani 2009), mustard (Oracz et al 2007), maize, pea and radish (Gmerek & Politycka 2011). Gmerek & Politycka (2011) attribute the lipid peroxidation to the phytochemicals ferulic and p-coumaric acids present in L. camara extracts (Yi et al 2006).…”