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- W2160773471 abstract "Involucral leaves of Leucadendron have the remarkable ability to turn yellow upon flowering and regreen naturally as the florets of the inflorescence wilt. This colour change results from degradation of chlorophyll (CHL) and to lesser degree carotenoids, resulting in the unmasking of yellow colour. CHL levels were restored upon regreening. Degreening coincided with the complete dismantling of the thylakoid system, whilst keeping the outer plastid envelope intact. Regreening resulted from the complete redifferentiation of these gerontoplast-like plastids into functional chloroplasts. The colour change was directly linked to the development of the inflorescence. Complete removal of the inflorescence before flowering prevented the colour change while removal at full bloom, when involucral leaves were yellow, resulted in significantly faster regreening. This designates the inflorescence or florets as the possible origin of the colour change trigger and suggests that the colour change is involved with attraction of pollinators. Degreening and regreening also took place in a growth chamber under continuous high light intensity. Therefore neither pollination nor the presence of roots is required for regreening. It appears that colour change in Leucadendron results from a well-regulated degradation and subsequent synthesis of photosynthetic pigments. The genus Leucadendron consists of woody, dioecious perennials, which often display great sexual dimorphism in leaf size and floral morphology (Dekock et al. 1994; Rebelo et al. 1995; Bond and Maze 1999). In female plants, upon cessation of shoot growth, a terminal cone develops from spirally arranged floral bracts, each subtending a small yellow floret at anthesis. The distal involucral leaves" @default.
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- W2160773471 date "2010-01-01" @default.
- W2160773471 modified "2023-09-27" @default.
- W2160773471 title "COLOUR DYNAMICS IN LEUCADENDRON" @default.
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