The colour may change depending on the composition and proportion of pigments. Bluish or reddish colours are due to the dominance of phycobilins (phycocyanin or phycoerythrin). A high proportion of carotenoids turn the greenish colour to yellowish, Orange or even red.
thank u Marina for answering whatever you stated is true meanwhile but I want to know why these colour variation occurs? is there any kind of adaption or evolutionary forces responsible for this.
Ficocianina e ficoeritrina sono rispettivamente pigmenti delle Alghe Azzure (o Cianobatteri) e delle Alghe rosse. Le piante superiori (Dicotiledoni e Monocotiledoni) hanno pigmenti diversi : le antocianine per il rosso e il blu ( il colore varia a seconda del pH cellulare), i carotenoidi per l'arancione e i flavonoidi per il colore giallo pallido o crema. Indubbiamente la loro presenza è legata ai diversi livelli evolutivi delle piante che li contengono
Dear Sir.
Because the plastids have different materials in them, such as chlorophyll, starch, etc, so they have different colors.
The pigment composition depends mainly of the phylogenetic original of the organisms. The colour depends of that composition and of the Environmental variables of the hábitat.
Although phylogeny control the composition but then how environment plays role in their colouration.
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