Differential transmission of extra genome chromosomes in pentaploid blueberry

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Transmission of extra genome chromosomes by three Vaccinium ashei (2n=6x=72)/V. corymbosum (2n=4x=48) pentaploid hybrids backcrossed to the hexaploid species V. ashei was examined. Chromosome numbers were determined for 36 and 31 progeny representing 5x × 6x and 6x × 5x type crosses, respectively. Chromosome numbers ranged from hypopentaploid (2n=4x+11=59) to hexaploid with means of 2n=66.2 for 5x × 6x progeny and 2n=68.0 for 6x × 5x progeny, representing overall extra genome chromosome gains of 3.3% and 33.3%, respectively. Extra chromosome number distributions for both the 5x × 6x and x × 5x progeny deviated significantly from the theoretical distribution assuming random chromosome transmission and were also found to be heterogeneous. The 2n=5x+9=69 class predominated in 6x × 5x progeny, while a predominate class was lacking in the 5x × 6x progeny. Higher than expected frequencies of plants with chromosome numbers near the pentaploid and hexaploid levels were found in the 5x × 6x progeny, whereas the frequency was only greater at the hexaploid number in 6x × 5x progeny. Present and previous results (Vorsa et al. 1986) indicate that extra genome chromosome transmission in oddploids can be influenced by selection at both gametophytic (pollen) and post-zygotic stages. However, post-zygotic selection may involve two different mechanisms acting concurrently: 1) chromosome imbalance due to aneuploidy and/or 2) endosperm imbalance referring to maternal: paternal genome ratios deviating from 2:1. Such a mechanism could result in differential transmission rates of extra genome chromosomes in oddploids when crosses are made to differing ploidy levels, and to reciprocal differences as well.

Original languageEnglish (US)
Pages (from-to)585-591
Number of pages7
JournalTheoretical and Applied Genetics
Volume75
Issue number4
DOIs
StatePublished - Apr 1 1988

Fingerprint

Blueberry Plants
blueberries
hexaploidy
Chromosomes
chromosome number
Genome
chromosomes
chromosome transmission
genome
Vaccinium virgatum
Vaccinium corymbosum
aneuploidy
ploidy
Plant Chromosomes
endosperm
Endosperm
Ploidies
pollen
Chromosomes, Human, Pair 1
Aneuploidy

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

Keywords

  • Aneuploidy
  • Blueberry
  • Endospermimbalance
  • Extrachromosome transmission
  • Pentaploid hybrid

Cite this

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title = "Differential transmission of extra genome chromosomes in pentaploid blueberry",
abstract = "Transmission of extra genome chromosomes by three Vaccinium ashei (2n=6x=72)/V. corymbosum (2n=4x=48) pentaploid hybrids backcrossed to the hexaploid species V. ashei was examined. Chromosome numbers were determined for 36 and 31 progeny representing 5x × 6x and 6x × 5x type crosses, respectively. Chromosome numbers ranged from hypopentaploid (2n=4x+11=59) to hexaploid with means of 2n=66.2 for 5x × 6x progeny and 2n=68.0 for 6x × 5x progeny, representing overall extra genome chromosome gains of 3.3{\%} and 33.3{\%}, respectively. Extra chromosome number distributions for both the 5x × 6x and x × 5x progeny deviated significantly from the theoretical distribution assuming random chromosome transmission and were also found to be heterogeneous. The 2n=5x+9=69 class predominated in 6x × 5x progeny, while a predominate class was lacking in the 5x × 6x progeny. Higher than expected frequencies of plants with chromosome numbers near the pentaploid and hexaploid levels were found in the 5x × 6x progeny, whereas the frequency was only greater at the hexaploid number in 6x × 5x progeny. Present and previous results (Vorsa et al. 1986) indicate that extra genome chromosome transmission in oddploids can be influenced by selection at both gametophytic (pollen) and post-zygotic stages. However, post-zygotic selection may involve two different mechanisms acting concurrently: 1) chromosome imbalance due to aneuploidy and/or 2) endosperm imbalance referring to maternal: paternal genome ratios deviating from 2:1. Such a mechanism could result in differential transmission rates of extra genome chromosomes in oddploids when crosses are made to differing ploidy levels, and to reciprocal differences as well.",
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Differential transmission of extra genome chromosomes in pentaploid blueberry. / Vorsa, Nicholi.

In: Theoretical and Applied Genetics, Vol. 75, No. 4, 01.04.1988, p. 585-591.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Differential transmission of extra genome chromosomes in pentaploid blueberry

AU - Vorsa, Nicholi

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