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Proc Natl Acad Sci U S A. 2015 Aug 18;112(33):10539-44. doi: 10.1073/pnas.1419791112. Epub 2015 Aug 4.

Heterochrony underpins natural variation in Cardamine hirsuta leaf form.

Author information

1
Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany;
2
Department of Plant Sciences, University of Oxford, Oxford OX1 3RB, United Kingdom;
3
Botanical Institute, University of Cologne, 50647 Cologne, Germany; Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany.
4
Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany; tsiantis@mpipz.mpg.de.

Abstract

A key problem in biology is whether the same processes underlie morphological variation between and within species. Here, by using plant leaves as an example, we show that the causes of diversity at these two evolutionary scales can be divergent. Some species like the model plant Arabidopsis thaliana have simple leaves, whereas others like the A. thaliana relative Cardamine hirsuta bear complex leaves comprising leaflets. Previous work has shown that these interspecific differences result mostly from variation in local tissue growth and patterning. Now, by cloning and characterizing a quantitative trait locus (QTL) for C. hirsuta leaf shape, we find that a different process, age-dependent progression of leaf form, underlies variation in this trait within species. This QTL effect is caused by cis-regulatory variation in the floral repressor ChFLC, such that genotypes with low-expressing ChFLC alleles show both early flowering and accelerated age-dependent changes in leaf form, including faster leaflet production. We provide evidence that this mechanism coordinates leaf development with reproductive timing and may help to optimize resource allocation to the next generation.

KEYWORDS:

Cardamine hirsuta; Flowering Locus C; compound leaf; heterochrony; natural variation

PMID:
26243877
PMCID:
PMC4547220
DOI:
10.1073/pnas.1419791112
[Indexed for MEDLINE]
Free PMC Article

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