TY - JOUR

T1 - Role of organic acids in the formation of the ionic composition in developing glycophyte leaves

AU - Osmolovskaya, N. G.

AU - Kuchaeva, L. N.

AU - Novak, V. A.

N1 - Funding Information: This work was supported by the Russian Foundation for Basic Research (project nos. 96-04-49893 and 99-04-49617) and the scientific program Universities of Russia (project no. UR.07.01.038). Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/5

Y1 - 2007/5

N2 - The ionic composition in the leaves of some glycophyte plants (Phaseolus vulgaris L., Lycopersicon esculentum L., and Amaranthus cruentus L.) was studied during leaf development. Plants were grown in a stationary hydroponic culture; a growth medium contained equimolar concentrations of inorganic ions (NO 3 - , Cl-, SO 4 2- , H2PO 4 - , K+, Ca2+, Mg2+, and Na+) equal to 5 mg-equiv./l for each ion. In the juvenile leaf, the main ions were K+ and water-soluble anions of organic acids represented mainly by di-and tricarboxylic acids in kidney bean and tomato and oxalic acid in amaranth. An increase in the total amount of organic anions, coinciding with the accumulation of bivalent cations, was registered in leaves of glycophytes during their development. Mature and senescing leaves of tomato and kidney bean accumulated mainly di-and tricarboxylic acid salts with the prevalence of Ca2+ ions. In amaranth leaves, the formation of water-insoluble (acid-soluble) oxalate pool containing Ca2+ ions (mature leaves) or Ca2+ and Mg 2+ ions (senescing leaves) was registered. The priority role of the metabolism of organic acids in the formation of the ionic composition of glycophyte leaves during their development is discussed. It is supposed that the species-specific ionic composition of glycophyte leaves at different developmental stages is due mainly to the pattern of carbon metabolism causing the accumulation either of di-and tricarboxylic acids or oxalic acid.

AB - The ionic composition in the leaves of some glycophyte plants (Phaseolus vulgaris L., Lycopersicon esculentum L., and Amaranthus cruentus L.) was studied during leaf development. Plants were grown in a stationary hydroponic culture; a growth medium contained equimolar concentrations of inorganic ions (NO 3 - , Cl-, SO 4 2- , H2PO 4 - , K+, Ca2+, Mg2+, and Na+) equal to 5 mg-equiv./l for each ion. In the juvenile leaf, the main ions were K+ and water-soluble anions of organic acids represented mainly by di-and tricarboxylic acids in kidney bean and tomato and oxalic acid in amaranth. An increase in the total amount of organic anions, coinciding with the accumulation of bivalent cations, was registered in leaves of glycophytes during their development. Mature and senescing leaves of tomato and kidney bean accumulated mainly di-and tricarboxylic acid salts with the prevalence of Ca2+ ions. In amaranth leaves, the formation of water-insoluble (acid-soluble) oxalate pool containing Ca2+ ions (mature leaves) or Ca2+ and Mg 2+ ions (senescing leaves) was registered. The priority role of the metabolism of organic acids in the formation of the ionic composition of glycophyte leaves during their development is discussed. It is supposed that the species-specific ionic composition of glycophyte leaves at different developmental stages is due mainly to the pattern of carbon metabolism causing the accumulation either of di-and tricarboxylic acids or oxalic acid.

KW - Amaranthus cruentus

KW - Development

KW - Glycophytes

KW - Ionic composition

KW - Leaf

KW - Lycopersicon esculentum

KW - Organic acids

KW - Phaseolus vulgaris

UR - http://www.scopus.com/inward/record.url?scp=34249748510&partnerID=8YFLogxK

U2 - 10.1134/S1021443707030077

DO - 10.1134/S1021443707030077

M3 - Article

AN - SCOPUS:34249748510

VL - 54

SP - 336

EP - 342

JO - Russian Journal of Plant Physiology

JF - Russian Journal of Plant Physiology

SN - 1021-4437

IS - 3

ER -