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Starch localisation in Mango tree: Histological observations

Normand F., Lagier S., Escoute J., Verdeil J.L., Mialet-Serra I.. 2009. In : Oosthuyse Steve A. (ed.). Proceedings of the eighth international mango symposium, Sun City, South Africa, February 5-10, 2006. Louvain : ISHS [Belgique], p. 245-250. (Acta Horticulturae, 820). International Mango Symposium. 8, 2006-02-05/2006-02-10, Sun City (Afrique du Sud).

Poor flowering and alternate bearing are major problems of mango which are commonly related to low carbohydrates level. Extensive work has been done on starch storage within the main components of the tree, roots, wood and leaves, and on relationships between starch and flowering. But study on starch location at a fine scale within the tree is lacking, as well as histological description of the storage organs and localisation of starch in the different tissues. Seventeen vegetative organs were sampled in a whole mango tree during the vegetative growth season. They were prepared for histological observation and starch grains dying. The main tissues found in roots, stem, branches and leaves of woody plants were present in mango. Leaf anatomy was characteristic of a plant adapted to semi-arid environment. On the basis of starch grains size and number, starch was mainly located in branches, coarse roots and taproot, and to a lesser extend, at least during the sampling season, in the stem and scaffolding branches. Leaves contained few starch grains. Starch was not distributed homogeneously within each organ: it was located in xylem parenchyma, and was absent from periderm. These results lead to sampling recommendation for starch analysis in woody organs.

Mots-clés : mangifera indica; glucide; amidon; anatomie végétale; phloème; xylème; réunion; france

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