Extrafloral Nectaries in Acacia mangium |
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Authors: | Chunhua Zhang Atsushi Kato Katsushi Kuroda Hisashi Abe |
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Institution: | (1) Wood Anatomy and Quality Laboratory, Department of Wood Properties, Forestry and Forest Products Research Institute, Matsuno-sato 1, Tsukuba Ibaraki, 305-8687, Japan |
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Abstract: | Our microscopy studies describe the anatomy of extrafloral nectaries on the abaxial side of the basal part of every leaf stalks
of Acacia mangium. The lens-like nectary expands with the development of the leafstalk, peaks at the stage at which the leafstalk itself has
reached its mature size. The nectary is composed of numerous small parenchyma cells and a nectar cavity in which the nectar
is pooled. Those small parenchyma cells are divided into nectariferous tissue and epithelial cells, which line the lumen of
the nectar cavity, and secretes the nectar into the same. Each nectary is surrounded by several vascular bundles, which probably
afford the nectar. In addition to the microscopic observation, the chemical constituents of the nectar are analyzed by NMR,
and it mainly consists of sugars with 60 % sucrose, 25 % glucose and 15 % fructose. |
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