Phytotoxins
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Reports outline phytotoxins research from A. Laranunez and colleagues
2009 JUN 15 - (NewsRx.com) -- According to recent research from Mexico, "The phytotoxic effect of allelochemicals is referred to as allelochemical stress and it is considered a biotic stress. Sicyos deppei G. Don (Cucurbitaceae) is an allelopathic weed that causes phytotoxicity in Lycopersicon esculentum, delaying seed germination and severely inhibiting radicle growth." "This paper reports in in vitro conditions, the effects of the aqueous leachate of S. deppei-throughout tomato germination times-on (1) the dynamics of starch and sugars metabolism, (2) activity and expression of the cell wall enzymes involved in endosperm weakening that allows the protrusion of the radicle, and (3) whether abscisic acid (ABA) is involved in this altered metabolic processes. Results showed that S. deppei leachate on tomato seed germination mainly caused: (1) delay in starch degradation as well as in sucrose hydrolysis; (2) lower activity of sucrose phosphate synthase, cell wall invertase, and alpha-amylase; being sucrose phosphate synthase (SPS) gene expression down-regulated, and the last two up regulated; (3) also, lower activity of endo beta-mannanase, beta-1,3 glucanase, alpha-galactosidase, and exo-polygalacturonase with altered gene expression; and (4) higher content of ABA during all times of germination," wrote A. Laranunez and colleagues. The researchers concluded: "The phytotoxic effect of S. deppei aqueous leachate is because of the sum of many metabolic processes affected during tomato seed germination that finally is evidenced by a strong inhibition of radicle growth." Laranunez and colleagues published their study in Physiologia Plantarum (Phytotoxic effects of Sicyos deppei (Cucurbitaceae) in germinating tomato seeds. Physiologia Plantarum, 2009;136(2):180-192). For additional information, contact A. Laranunez, University of Nacl Autonoma Mexico UNAM, Institute Ecology, Laboratory Alelopatia, Apartado Postal 70-275, Mexico City 04510, DF, Mexico. Publisher contact information for the journal Physiologia Plantarum is: Wiley-Blackwell Publishing, Inc., Commerce Place, 350 Main St., Malden 02148, MA, USA. Keywords: Mexico, Phytotoxins, Alternative Medicine, Metabolism, Therapy, Treatment. This article was prepared by Biotech Business Week editors from staff and other reports. Copyright 2009, Biotech Business Week via NewsRx.com.
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