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Increased nuclear DNA content in developing cotton fiber cells.

J Van't Hof1

  • 1Biology Department, Brookhaven National Laboratory, Upton, New York 11973.

American Journal of Botany
|June 18, 1999
PubMed
Summary

Cotton fiber cells show a significant increase in nuclear DNA content during early development. This DNA amplification suggests selective gene amplification or partial genome replication in developing cotton fibers.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Cotton fiber development is crucial for textile production.
  • Understanding nuclear DNA changes provides insights into cell growth and differentiation.

Purpose of the Study:

  • To quantify the changes in nuclear DNA content during early cotton fiber development.
  • To investigate the mechanisms behind DNA content increase in cotton fibers.

Main Methods:

  • Quantitative analysis of nuclear DNA content using Hoechst 33258 staining and fluorescence.
  • Feulgen staining and two-wavelength cytospectrophotometry were employed.
  • A novel method for isolating cotton fiber cell nuclei was utilized.

Main Results:

  • Nuclear DNA content in cotton fibers (Gossypium hirsutum) increased by approximately 24% by 2 days postanthesis (dpa).
  • DNA content rose from 5.4 ± 0.27 pg at 2 dpa to 6.7 ± 0.24 pg at 3-4 dpa, and 6.8 ± 0.70 pg at 5 dpa.
  • DNA content increased irrespective of ovule fertilization status.

Conclusions:

  • Early cotton fiber development involves a substantial increase in nuclear DNA content.
  • This increase is likely due to selective amplification of specific DNA sequences or entry into S-phase for partial genome replication.

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