Journal Article

Changes in Growth and Structure of Pea Primary Roots (<i>Pisum sativum</i> L. cv. Alaska) as a Result of Sudden Flooding

Teruo Niki and Daniel K. Gladish

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 7, pages 694-702
Published in print July 2001 | ISSN: 0032-0781
Published online July 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce086
Changes in Growth and Structure of Pea Primary Roots (Pisum sativum L. cv. Alaska) as a Result of Sudden Flooding

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  • Biochemistry
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Pea (Pisum sativum L. cv. Alaska) primary roots were exposed to flooding after growth for 4 or 5 d at 25°C under relatively dry conditions. Flooding after 4 d growth reduced, but did not stop, primary root growth, and cavities caused by degradation of central vascular cells were typically found from 10–60 mm from the tips. Flooding after 5 d stopped primary root growth and caused cell death in the tips, and vascular cavities formed that typically were 20–60 mm from the tips of the roots. Degradation of root tip cells in 5-day-roots was very rapid and began in the elongation zone and later in the apical zone. Root tips discolored, narrowed or curled before growth arrest. The mitotic indices of 5-day-root tips were suppressed by the flooding treatment. A few mitotic figures were observed in roots treated with flooding after 4 d growth. Affected cells had condensed nuclei, but cytoplasms appeared to be normal in the early stages of cell degradation. Later these cells became very vacuolated. The relationship of flooding to root growth, vascular cavity formation, and the morphology of pea primary roots is described with regard to the ability to resist flooding stress.

Keywords: Key words: Aerenchyma — Flooding response — Pea (Pisum sativum L. cv. Alaska) — Root growth — Root structure — Vascular cavity.; Abbreviations: SP-cell, specialized parenchyma cell; LM, light microscopy; VC, vascular cylinder.

Journal Article.  5103 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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