ArticleGenetics2007
B chromosome polymorphism in maize landraces: adaptive vs. demographic hypothesis of clinal variation.
Article in Genetics, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- Distribution of B chromosomes in Prospero autumnale associates with higher reproductive performance in southern Iberia.Genetica · 2026Article
- Genetic and environmental influences on the distributions of three chromosomal drive haplotypes in maize.PLoS genetics · 2025Article
- Morphological and genetic diversity of maize landraces along an altitudinal gradient in the Southern Andes.PloS one · 2022Article
- Intragenomic Conflict between Knob Heterochromatin and B Chromosomes Is the Key to Understand Genome Size Variation along Altitudinal Clines in Maize.Plants (Basel, Switzerland) · 2021Article
- Evaluation of Cross-Species Transferability of SSR Markers inPlants (Basel, Switzerland) · 2020Article
- Cytological variations and long terminal repeat (LTR) retrotransposon diversities among diploids and B-chromosome aneuploids in Lilium amabile Palibin.Genes & genomics · 2019Article
- Review
- Exploring karyotype diversity of Argentinian Guaraní maize landraces: Relationship among South American maize.PloS one · 2018Article
- Genome size variation in wild and cultivated maize along altitudinal gradients.The New phytologist · 2013Article
- Cytomolecular characterization of de novo formed rye B chromosome variants.Molecular cytogenetics · 2012Article
- Microsatellite variation in maize landraces from Northwestern Argentina: genetic diversity, population structure and racial affiliations.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2009Article
Corrections and comments
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Cytogenetic analysis of maize landraces from northwestern Argentina has revealed an altitudinal cline in the mean number of B chromosomes (B's) per plant, with cultivars growing at higher altitudes exhibiting a higher number of B's. Altitudinal and longitudinal clines are frequently interpreted as evidence of selection, however, they can also be produced by the interplay between drift and spatially restricted gene flow or by admixture between previously isolated populations that have come into secondary contact. Here, we test the adaptive significance of the observed altitudinal gradient by comparing the levels of differentiation in the mean number of B's to those obtained from 18 selectively neutral loci [simple sequence repeats (SSRs)] among seven populations of the cline. The adequacy of alternative genetic-differentiation measures was determined, and associations between cytogenetic, genetic, and altitudinal distances were assessed by means of matrix- correspondence tests. No evidence for association between pairwise F(ST) and altitudinal distance or B-chromosome differentiation was found. The contrasting pattern of altitudinal divergence between the mean number of B's per plant and the genetic differentiation at SSR loci indicates that demographic processes cannot account for the observed levels of divergence in the mean number of B's.
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