Dictionary » P » Plastid



noun, plural: plastids

A double membrane bound organelle involved in the synthesis and storage of food, and is commonly found within the cells of photosynthetic organisms, like plants.


Its function largely depends on the presence of pigments. A plastid involved in food synthesis typically contains pigments, which are also the ones responsible for the color of a plant structure (e.g. green leaf, red flower, yellow fruit, etc.).

A plastid containing green pigment (chlorophyll) is called chloroplast whereas a plastid containing pigments apart from green is called chromoplast. A plastid that lacks pigments is called leucoplast, and is involved mainly in food storage. A leucoplast may be an amyloplast that stores starch, an elaioplast that stores fat, or a proteinoplast that stores proteins.

Like mitochondria, plastids have their own DNA and ribosomes. Hence, they may be used in phylogenetic studies.

Word origin: G Plastide < Gk plastid-, s. of plástis, fem. deriv. of plástés modeler, creator, deriv. of plássein to form.

Derived terms: chloroplast, chromoplast, leucoplast, amyloplast, elaioplast, proteinoplast.

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sugestion pls

... to bioplastic production in plants. i have an source gene from an microbe. in order to avoid the codon optimiztion procedure i am tinkin to go for plastid transformation. will this method will be useful for me/? for this method whether i should go for agrobacterium mediated or biolistic method? ...

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by sarguna
Thu Sep 02, 2010 5:23 am
Forum: General Discussion
Topic: sugestion pls
Replies: 1
Views: 1190

Mitochondrial transformation?

... figure out where DNA is stored in the plant. There are 3 locations: the nucleus, the chloroplast, and the mitochondria. Nuclear transformation and plastid transformation have been achieved. My question is: why hasn't mitochondria transformation been achieved?

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by christinatu
Wed Oct 14, 2009 4:24 am
Forum: Molecular Biology
Topic: Mitochondrial transformation?
Replies: 5
Views: 3715

How much RNA is there in a cell?

... whether the complete chromosomes are similar. Both posts are correct. (Althrough, I think, that not whole ribosome is coded by mitochondrion/plastid). My point is, that plastids and mitochondrion are coding for different proteins (e.g. photosynthesis aparathus in chloroplast × Calvin cycle ...

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by JackBean
Sat Oct 03, 2009 5:12 am
Forum: Genetics
Topic: How much RNA is there in a cell?
Replies: 7
Views: 4064

Re: Any SOLID arguments against evolution?

... endosymbiosis of algae by protists gave rise to photosynthetic protists. "The following quote gives us a picture of how evolutionists believe plastid endosymbiosis may have occurred: " 'Endosymbiosis may be initiated when a phagotrophic protist engulfs an alga as prey. The protist fails, ...

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by AFJ
Sat May 23, 2009 2:34 am
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 591880

Metaphorical representation of chromoplasts

... means that say, for a mitochondria, i need something like a small engine, for the nucleus, a brain, etc. I know the function of the chromoplast (a plastid that stores and synthesizes pigments, that, inevitably makes photosynthesis more efficient for the certain eukaryotic species over different ...

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by thatonekid
Mon Nov 03, 2008 1:10 am
Forum: Cell Biology
Topic: Metaphorical representation of chromoplasts
Replies: 5
Views: 3841
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