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Titre :
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Phloem in developing cotton fruits: 6(5)Carboxyfluorescein as a tracer for functional phloem
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Auteurs :
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M. Vaniersel ;
W. Harris ;
D. Oosterhuis
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Type de document :
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article/chapitre/communication
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Année de publication :
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1995
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Format :
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321-328
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Langues:
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= Anglais
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Mots-clés:
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cotton
;
Gossypium hirsutum L
;
phloem
;
fruit
;
carboxyfluorescein
;
vasculature
;
Phloeme
;
Anatomie
;
Ultrastructure
;
Gossypium hirsutum
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Résumé :
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Carbohydrate and water transport into developing cotton (Gossypium hirsutum L.) fruits is essential for normal fruit development, and phloem has been suggested to play a major role in this transport. To study transport into cotton fruits of different developmental stages, a phloem tracer [6(5)carboxyfluorescein] was applied to sympodial leaves. Tracer distribution into the subtended fruit was determined using epifluorescence microscopy. Phloem throughout the entire capsule wall and central column was functional from early stages of fruit development. Vasculature of the capsule wall consisted of a complex three-dimensional network. Vascular bundles ended in radially-oriented club-shaped structures, which consisted mainly of fibres, with phloem on the outside of these structures. the vascular system of the capsule wall was connected to the central column by amphicribral bundles in the partitions. The central column had two adaxial (ventral) vascular bundles per carpel. These vascular bundles branched into the placental region of the central column, and connected to the seeds via the funiculi. Amphicribral vascular bundles diverged from these adaxial bundles into the partition. The results of this study confirmed previous observations on the vascular anatomy of the capsule wall and describe the vascular anatomy of the central column of cotton fruits.
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Source :
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Journal of Experimental Botany - 0022-0957, vol. 46, n° 284
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