Analysis of sub-populations of rapid-cycling Brassica rapa following recurrent bi-directional selection for cotyledon size

N. Tel-Zur, I. L. Goldman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Recurrent selection programmes use one or just a few selection criteria, however other indirect traits may be unpredictably changed in a population. This study was conducted to determine the indirect effects of 10 cycles of bi-directional recurrent selection for cotyledon size in the model system of rapid-cycling Brassica rapa. Eight sub-populations (four large- and four small-cotyledon sizes) were phenotypically and cytologically evaluated. Each sub-population was measured by five phenotypic traits. Ploidy and pollen viability were studied and compared with the initial population. Total weight was significantly different in broad and bottleneck-1 sub-populations. Total cell number exhibited statistically significant differences in broad and bottleneck-1 sub-populations, while cell number per unit area exhibited statistically significant differences in broad, bottleneck-2 and bottleneck-3 sub-populations. Decreases in pollen viability in comparison with the base population were observed in three sub-populations. Among the eight sub-populations studied, the most significant phenotypic differences were observed within broad sub-populations. Based on the above, it is possible that bi-directional recurrent selection for cotyledon size may have been a result of indirect selection for two processes, endoreduplication and cell division.

Original languageEnglish
Pages (from-to)62-66
Number of pages5
JournalPlant Breeding
Volume126
Issue number1
DOIs
StatePublished - 1 Feb 2007

Keywords

  • Brassica rapa
  • Cotyledon size
  • Cytology
  • Phenotypic traits
  • Recurrent selection

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