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Biochemical, physiological and isotopic responses to natural product p-hydroxybenzoic acid in Cocksfoot ‪(Dactylis glomerata L.‎)‬.‎

The present study was conducted to evaluate the role of natural compound p-hydroxybenzoic acid (pHBA) on physiological, biochemical and isotopic responses of Dactylis glomerata L.‎ Application of pHBA in the range 0.‎5–1.‎5 mM reduced the leaf fresh/dry biomass, shoot/root length, relative water content and leaf osmotic potential of D.‎ glomerata.‎ pHBA decreased the photosynthetic efficiency and quantum yield of photosystem II photochemistry in D.‎ glomerata seedlings following treatment at all concentrations.‎ Photochemical and nonphotochemical fluorescence quenching were reduced after treatment with 1.‎5 mM pHBA.‎ Carbon isotope composition ratio in D.‎ glomerata leaves was significantly less negative following treatment with pHBA than the control.‎

Carbon isotope discrimination value was declined by pHBA.‎ The leaf protein content was lower after treatment with 1.‎5 mM pHBA.‎ Our results suggest that pHBA possesses allelopathic potential against D.‎ glomerata and this study provide new insights into the physiological, biochemical and isotopic action mechanism of pHBA.‎

Authors: 
Hussain, M.‎ I, Reigosa, M.‎ J, Al-Dakheel, A.‎ J
Year: 
۲۰۱٤
Publication type: 
Scientific Paper
Publication Source: 
Plant Growth Regulation
Volume/Chapter/Issue: 
۷۵
Page Number: 
۷۸۳-۷۹۲
ISBN: 
ISSN 0167-6903