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. 1979 Jul;64(1):126–130. doi: 10.1104/pp.64.1.126

Changes in Chloroplast DNA Levels during Development of Pea (Pisum sativum) 1

Gayle K Lamppa a, Arnold J Bendich a
PMCID: PMC543038  PMID: 16660899

Abstract

Determinations were made of the percentage of chloroplast DNA (ct DNA) in total cell DNA isolated from shoots of pea at different stages of development. Labeled pea ct DNA was reassociated with a high concentration of total DNA; the percentage of ct DNA was estimated by comparing the rate of reassociation of this reaction with that of a model reaction containing a known concentration of unlabeled ct DNA. The maximum change in ct DNA content was from 1.3% of total DNA in young shoots to 7.3% in fully greened shoots. Analyses were also performed on DNA from embryos, etiolated tissue, roots, and leaves. The first leaf set to develop in pea was excised over a growth period of 8 days during which leaf length increased from 4 to 12 millimeters. Young leaves contained about 8% ct DNA; in fully greened leaves the level of ct DNA approached 12%, equivalent to as many as 9,575 copies of ct DNA per cell. Root tissue contained only 0.4% ct DNA.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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