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Effect of hormones on nucleolar growth and vacuolation in elongating cotton fibers

Abstract

A rather precise combination of the three phytohormones, gibberellic acid, auxin, and abscisic acid, is necessary for the considerable growth of fiber nucleoli in Gossypium hirsutum L. for about 8 days after anthesis and for nucleolar “vacuolation” in the second half of that period. Nucleolar growth and vacuolation must occur in a precise sequence for the fiber to reach a good final length. Nucleolar vacuolation indicates simultaneous output and neosynthesis of nucleolar material.

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Abbreviations

ABA:

abscisic acid

2,4-D:

2,4-dichlorophenoxyacetic acid

FAA:

5% acetic acid glacial, 5% formaldehyde (35%), 90% ethanol (50%)

Fl:

fiber length

Flx :

fiber length at day “x” post anthesis

GA3 :

gibberellic acid

IAA:

indole-3-acetic acid

NPS:

nonpollinated, grown in situ

Nu:

nucleolus

NuS:

size of the nucleolus

PS:

normal pollination, grown in situ

PV:

pollinated, grown in vitro

Vac F:

vacuolation frequency

References

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De Langhe, E., Kosmidou-Dimitropoulou, S. & Waterkeyn, L. Effect of hormones on nucleolar growth and vacuolation in elongating cotton fibers. Planta 140, 269–273 (1978). https://doi.org/10.1007/BF00390259

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Key words

  • Abscisic acid
  • Auxin Cell elongation
  • Fibers
  • Gibberellin
  • Gossypium
  • Nucleolus