title: Influence of short-term silicon application on endogenous physiohormonal levels of Oryza sativa L. under wounding stress.
abstract: The current study was conducted in order to investigate the short-term effects (6, 12, and 24 h) of silicon (Si) on the endogenous hormonal composition of rice (Oryza sativa L. cv. Dongjin-beyo), with and without wounding stress. Si applied in different concentrations (0.5, 1.0, and 2.0 mM) significantly promoted shoot length, plant biomass, and chlorophyll content of rice plants. Plants treated with different concentrations of sole Si for 6, 12, and 24 h had higher endogenous jasmonic acid contents than control. However, a combined application of wounding stress and Si induced a significantly small quantity of endogenous jasmonic acid as compared with control. On the contrary, endogenous salicylic acid level was significantly higher in sole Si-treated plants, while after wounding stress, a similar trend was observed yet again. After 6, 12, and 24 h of Si applications, with and without wounding stress, ethylene levels were significantly lower in comparison to their respective controls. The findings of the present study perpetrate the beneficial role of Si on the growth and development of rice plant by relieving physical injury and stress. Si also affects endogenous jasmonic acid and ethylene levels, while an inverse correlation exists between jasmonic acid and salicylic acid under wounding stress conditions.
authors.affiliation: School of Applied Biosciences, Kyungpook National University, Daegu, 702-701, South Korea.
authors.forename: Yoon-Ha
authors.initials: YH
authors.lastname: Kim
authors.forename: Abdul Latif
authors.initials: AL
authors.lastname: Khan
authors.forename: Muhammad
authors.initials: M
authors.lastname: Hamayun
authors.forename: Sang Mo
authors.initials: SM
authors.lastname: Kang
authors.forename: Yoon Jung
authors.initials: YJ
authors.lastname: Beom
authors.forename: In-Jung
authors.initials: IJ
authors.lastname: Lee
mesh_terms: D002734:Chlorophyll / Q000096:biosynthesis; D002851:Chromatography, High Pressure Liquid; D003517:Cyclopentanes / Q000032:analysis / Q000302:isolation & purification / Q000378:metabolism; D005030:Ethylenes / Q000378:metabolism; D008401:Gas Chromatography-Mass Spectrometry; D012275:Oryza / Q000254:growth & development / Q000502:physiology*; D054883:Oxylipins / Q000032:analysis / Q000302:isolation & purification / Q000378:metabolism; D010937:Plant Growth Regulators / Q000378:metabolism*; D020156:Salicylic Acid / Q000032:analysis / Q000302:isolation & purification / Q000378:metabolism; D017640:Silicates / Q000633:toxicity*; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence; D013312:Stress, Physiological / Q000187:drug effects*
chemical_list: D003517:Cyclopentanes; D005030:Ethylenes; D054883:Oxylipins; D010937:Plant Growth Regulators; D017640:Silicates; D002734:Chlorophyll; C011006:jasmonic acid; C036216:ethylene; C005691:sodium silicate; D020156:Salicylic Acid