University of Illinois Urbana-Champaign

Cell cycle parameters and sweet corn emergence and seedling vigor

Meyer, Annette Carol

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Description

Title
Cell cycle parameters and sweet corn emergence and seedling vigor
Author(s)
Meyer, Annette Carol
Issue Date
1995
Doctoral Committee Chair(s)
Juvik, John A.
Department of Study
Crop Sciences
Discipline
Crop Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Agriculture, Agronomy
  • Biology, Cell
Language
eng
Abstract
  • Sweet corn genotypes containing the shrunken2 (sh2) endosperm mutation are associated with reduced emergence and poor seedling vigor. Shrunken2 genotypes with known differences for field emergence and vigor were used to investigate the contribution of seedling cell division to emergence and seedling growth. Variation among genotypes was observed for all of the cell division cycle phases which include G1, S, and G2. The S phase, when cells are undergoing DNA replication, showed the closest association to seedling growth. Inbred lines homozygous for starchy (Su1) endosperm displayed a significantly higher proportion of nuclei in the S phase than the same inbred homozygous for the sh2 endosperm mutation. Among all the genotypes tested, the proportion of nuclei in the S phase was positively correlated with field emergence and seedling vigor.
  • Variation was observed among sh2 genotypes for the rate of cell division in seedling shoots, which was measured by a method using nitrogen-15 to label DNA. Rates of DNA replication during the S phase in six to nine day old sh2 sweet corn seedlings were highly and positively correlated with field emergence and seedling growth rates.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/21881
Copyright and License Information
Copyright 1995 Meyer, Annette Carol

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Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Crop Sciences