Axial changes in apoplast properties in the elongation zone of maize mesocotyl
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- 作者：E. I. Sharova (1) elenasharova@mail.ru
T. E. Bilova (1)
S. S. Medvedev (1) - 关键词：Zea mays – ; mesocotyl – ; elongation growth – ; cell wall – ; metabolites – ; hydrogen peroxide – ; oxidoreductases – ; auxin – ; abscisic acid
- 刊名：Russian Journal of Plant Physiology
- 出版年：2012
- 出版时间：July 2012
- 年：2012
- 卷：59
- 期：4
- 页码：565-572
- 全文大小：159.2 KB
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- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Life Sciences
Plant Physiology
Plant Sciences
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1608-3407
文摘
Changes in extensibility of cell walls and composition of apoplastic solution along the elongation zone were studied in mesocotyls of etiolated seedlings of maize (Zea mays L.). It was found that plastic and elastic extensibility of cell walls was much greater in the cells with a high rate of elongation. Basipetal decrease in hydrogen peroxide concentration in the apoplast (from 5.1 to 2.0 μM) was detected. We determined the activity of cell wall enzymes participating in H2O2 metabolism and found that in basal direction, potential ability of these enzymes to decompose H2O2 rises stronger than the ability to produce it. We found a basipetal decrease in polyamine oxidase activity, an increase in oxalate oxidase activity, and a rise in the ratio between peroxidase and NADH-oxidase activities of peroxidases. IAA (10−6 M) promoted elongation of mesocotyl segments, induced a steady elevation of H2O2 content in the apoplast, an increase in NADH-oxidase activity of peroxidases, and a transient decrease in oxalate oxidase activity. Treatment with ABA (10−4 M) suppressed elongation of mesocotyl segments, induced a transient elevation of H2O2 content in the apoplast, and a decrease in oxalate oxidase activity. It was shown that the main metabolites of apoplastic solution are glucose (20–30 mM), fructose (6–7 mM), malic acid (3 mM), and amino acids, namely, Asp, Glu, Asn, Gln, Ala, Val, Ser, Thr, and Phe. In basal direction, we observed a decrease in the content of glucose (from 30 to 20 mM), inositol (from 0.24 to 0.08 mM), and total amino acids (from 5.5 to 3.3 mM), whereas concentration of orthophosphate (3 mM) and malate (3 mM) did not change significantly. A relationship between the detected changes in the apoplast composition and basipetal decrease in the elongation rate of mesocotyl cells is discussed.