elaioplast


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elaioplast

[ə′lī·ə‚plast]
(histology)
An oil-secreting leucoplast.
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Elaioplast is the final stage of tapetal plastid development (Fig.
First, in strictly anemophilous species, such as Lolium perenne, plastids first develop into chromoplast, later in elaioplast, and then are resorbed with the other tapetal cell components (Pacini et al.
Finally, prior to tapetum degeneration, elaioplast lipids mix with spherosomes and constitute the main part of the pollenkitt, which will reach the pollen wall (Fitzgerald et al.
Even in the same family-for example, the Solanaceae-the pathway of plastid development in the tapetum is the same until elaioplast differentiation.
In differentiated cells, plastids can be involved in anabolism (chloroplasts) or in storing reserves in amyloplasts and elaioplasts (Wheatley, 1977).
Both tapetosomes and elaioplasts are involved in the formation of tapetal lipids that are released in the locule to form tryphine (Dickinson & Lewis, 1973) by extra situm degeneration (Pacini & Franchi, 1991).
1993), or when elaioplasts are already differentiated, as in Lilium (Clement et al.
One reason may be pollination type, which influences the resorption (or not) of tapetal elaioplasts and the physicochemical properties of pollenkitt.
Pacini and Juniper (1979b) suggested that tapetal cell plastids, before they become elaioplasts, move around the vacuole.
Whether the initiation or chemical composition of tapetosomes or elaioplasts (Piffanelli & Murphy, 1998) is related to pro-orbicules is unknown.