title: Changes in carbohydrate metabolism by triazole growth regulators in cassava (Manihot esculenta Crantz); effects on tuber production and quality.
abstract: We have evaluated the ability of two triazole growth regulators, viz. triadimefon (TDM) and hexaconazole (HEX), in the enhancement of tuber production and quality in cassava (Manihot esculenta Crantz) through their effects on carbohydrate metabolism. One litre of 20 mg(-1) TDM and 15 mg(-1) HEX solution per plant were used for the treatments and groundwater was given to control plants. Triazole treatments reduced plant height and leaf area, but increased fresh and dry weights. Plants treated with TDM showed an increased net assimilation rate, which is followed by HEX and control plants. Triazole compounds increased the relative growth rate of cassava after 200 DAP, i.e. in the phase of tuber enlargement. Triazole compounds increased the starch and other carbohydrate contents and carbohydrate metabolising enzyme activities. From the results of this study, it can be concluded that these triazoles can significantly enhance the tuber production and quality by affecting the starch metabolism, apart from their fungicidal properties.
authors.affiliation: Stress Physiology Laboratory, Department of Botany, Annamalai University, Annamalainagar 608 002, Tamil Nadu, India. gomsnayagam@yahoo.com
authors.forename: Muthiah
authors.initials: M
authors.lastname: Gomathinayagam
authors.forename: Cheruth Abdul
authors.initials: CA
authors.lastname: Jaleel
authors.forename: G M Alagu
authors.initials: GM
authors.lastname: Lakshmanan
authors.forename: Rajaram
authors.initials: R
authors.lastname: Panneerselvam
mesh_terms: D005659:Fungicides, Industrial / Q000494:pharmacology; D005964:Glucosyltransferases / Q000378:metabolism; D002365:Manihot / Q000187:drug effects / Q000254:growth & development*; D010937:Plant Growth Regulators / Q000302:isolation & purification / Q000494:pharmacology / Q000502:physiology*; D018515:Plant Leaves / Q000033:anatomy & histology / Q000187:drug effects; D018547:Plant Stems / Q000187:drug effects / Q000254:growth & development; D024941:Starch Phosphorylase / Q000378:metabolism; D014230:Triazoles / Q000494:pharmacology*; D043324:beta-Fructofuranosidase / Q000378:metabolism
chemical_list: D005659:Fungicides, Industrial; D010937:Plant Growth Regulators; D014230:Triazoles; C032910:triadimefon; D005964:Glucosyltransferases; D024941:Starch Phosphorylase; C022699:sucrose synthase; D043324:beta-Fructofuranosidase; C409722:hexaconazole