Abstract
During grain filling in wheat ( Triticum aestivum L.) there is a progressive increase in the number of amyloplasts in the endosperm, as well as in cell number, DNA content and nuclear ploidy as the grain increases in size. The plastid DNA content also rises initially, and then there is a levelling off in the amount, with the percentage plastid DNA finally making up approximately 0.9% of the total endosperm DNA.
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