title: Comparative analysis of polyamine metabolism in wheat and maize plants.
abstract: In the present work changes in polyamine contents were investigated after various hydroponic polyamine treatments (putrescine, spermidine and spermine at 0.1, 0.3 and 0.5 mM concentrations) in two different crop species, wheat and maize. In contrast to putrescine, higher polyamines (spermidine and spermine) induced concentration-dependent oxidative damage in both crops, resulting in decreased biomass. The unfavourable effects of polyamines were more pronounced in the roots, and maize was more sensitive than wheat. The adverse effects of polyamine treatment were proportional to the accumulation of polyamine and the plant hormone salicylic acid in the leaves and roots of both plant species. Changes in polyamine content and catabolism during osmotic stress conditions were also studied after beneficial pre-treatment with putrescine. The greater positive effect of putrescine in wheat than in maize can be explained by differences in the polyamine metabolism under normal and osmotic stress conditions, and by relationship between polyamines and salicylic acid. The results demonstrated that changes in the polyamine pool are important for fine tuning of polyamine signalling, which influences the hormonal balance required if putrescine is to exert a protective effect under stress conditions.
authors.affiliation: Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary.
authors.forename: Gabriella
authors.initials: G
authors.lastname: Szalai
authors.affiliation: Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary.
authors.forename: Katalin
authors.initials: K
authors.lastname: Janda
authors.affiliation: Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary.
authors.forename: Éva
authors.initials: É
authors.lastname: Darkó
authors.affiliation: Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary.
authors.forename: Tibor
authors.initials: T
authors.lastname: Janda
authors.affiliation: Department of Photosynthesis, Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bldg. 21, 1113 Sofia, Bulgaria.
authors.forename: Violeta
authors.initials: V
authors.lastname: Peeva
authors.affiliation: Agricultural Institute, Centre for Agricultural Research, Hungarian Academy of Sciences, POB 19, 2462 Martonvásár, Hungary. Electronic address: pal.magda@agrar.mta.hu.
authors.forename: Magda
authors.initials: M
authors.lastname: Pál
mesh_terms: D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D005453:Fluorescence; D005740:Gases / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008954:Models, Biological; D009997:Osmotic Pressure / Q000187:drug effects; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D011073:Polyamines / Q000378:metabolism* / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000494:pharmacology; D011392:Proline / Q000378:metabolism; D011700:Putrescine / Q000378:metabolism / Q000494:pharmacology; D020156:Salicylic Acid / Q000378:metabolism; D013095:Spermidine / Q000378:metabolism / Q000494:pharmacology; D013096:Spermine / Q000378:metabolism / Q000494:pharmacology; D014908:Triticum / Q000187:drug effects / Q000378:metabolism*; D003313:Zea mays / Q000187:drug effects / Q000378:metabolism*
chemical_list: D005740:Gases; D011073:Polyamines; D002734:Chlorophyll; D013096:Spermine; D011092:Polyethylene Glycols; D011392:Proline; D010650:Phenylalanine Ammonia-Lyase; D020156:Salicylic Acid; D013095:Spermidine; D011700:Putrescine; D000077194:Chlorophyll A
keywords: Maize; Osmotic stress; Polyamines; Salicylic acid; Wheat