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Fruit anatomy, fruit and leaf absission zones
Citrus fruit is considered a berry
because it has many seeds (pips), is
fleshy, soft and develops from a single ovary;
(this specific type of berry is
called hesperidium - a berry with leathery rind).
Citrus fruit is characterized by non-climacteric
Tissue surrounding a
seed that develops from the ovary wall of the flower.
Also peel or exocarp;
rind contains numerous pits
containing volatile oil glands.
Mesocarp; a spongy white
tissue on the inside of the rind. Albedo consists of spongy layers of perenchymatus cells rich of glycosides (flavanones). Pectin and pectic enzymes make it bitter. The thread-like vascular bundles run from the albedo along the fruit's axis forming a network outside the carpels. They are rich in peroxidase.
Or epicarp; external
colored part of the rind.
- Albedo Mesocarp; a spongy white
A fleshy interior (endocarp) of the citrus fruit
- Carpel Sections of the citrus fruit
- Juice sac
is specialized hair cell.
- Rind Also peel or exocarp; orange
- Pericarp Tissue surrounding a seed that develops from the ovary wall of the flower.
zone A distinct process that culminates in the shedding of plant parts due to a series of physiological and biochemical events that lead to cell wall breakdown in the few rows of cells on either side of the fracture line and, ultimately, to detachment of the organ; mature citrus fruits require unusually large forces to remove them from the tree, and this has been an obstacle to efficient and economical mechanical harvesting; it is why citrus fruit abscission and its regulation attracts much attention of researches.
zone This AZ is located between the branch and the petiole.
zone This AZ is located between the petiole and the leaf blade.
zone A This AZ is located between the branch and the fruit penduncle.
zone C this AZ is located in the fruit calix (cup-like structure at the end of the fruit where the fruit is attached to the penduncle).
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- Iglesias DJ et al. Physiology of citrus fruiting. Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias, Apdo.Nov. 2007 (.pdf)