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Annals of Botany 86: 185-190, 2000
© 2000 Annals of Botany Company

Endoreduplication Occurs during Pod Wall Development in Temperate Grain Legumes

Luz del Carmen Lagunes-Espinoza, Christian Huyghe+, David Bousseau, Phillippe Barre and Jacques Papineau

Institut National de la Recherche Agronomique, Unité de Génétique de d'Amélioration des Plantes Fourragères, 86600, Lusignan, France

Received: 31 January 2000 ; Returned for revision: 10 March 2000 . Accepted: 5 April 2000

Differentiation to a specialized function in plant tissue is associated with an increase in the DNA content of the cells over the diploid state. Using flow cytometry, ploidy levels were assessed during pod development in three white lupin genotypes under three environmental conditions and in other lupin species and temperate grain legumes in one environmental condition. Endoreduplication was found in the pod walls of all genotypes studied. Higher ploidy levels coincided with maximal growth of the pod. DNA replication was not related to the proportion of the pod that comprised walls. Endoreduplication also occurred in other temperate grain legumes with at least two DNA duplications during the development of the pod walls. The biological significance of endoreduplication in the pod walls of grain legumes is unknown, but could be related to the storage function of these organs.Copyright 2000 Annals of Botany Company

Lupinus species, Pisum sativum, Phaseolus vulgaris, Vicia faba, pod wall development, ploidy level, flux cytometry, Bis-benzimide Hoechst 33258


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