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Effect of ChCUC1 induction on gene expression in Cardamine hirsuta leaf development

ABSTRACT: Effect of ChCUC1 induction on gene expression in Cardamine hirsuta leaf development

PROVIDER: PRJNA1006304 | ENA |

REPOSITORIES: ENA

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Effect of ChCUC1 induction on gene expression in Cardamine hirsuta leaf development

Project description:Here we investigate the function of CUC1(CUP-SHAPED COTYLEDON1) in the diversification of leaf forms between simple-leaved Arabidopsis thaliana and compound-leaved Cardamine hirsuta. CUC transcription factors are conserved regulators in leaf margin dissection and leaflet formation. ChCUC1, ChCUC2 and ChCUC3 function redundantly and are required for the leaflet formation in C. hirsuta. Recently we discovered that ChCUC1 has species species-specific expression in young leaves of C.hirsuta. Moreover, interspecies gene transfer of ChCUC1 allele into A.thaliana is sufficient to increase leaf complexity. On this basis, we hypothesize that redeployment of ChCUC1 in leaves contributes to the formation of leaflets instead of serrations. However, the mechanism underlying ChCUC1 regulating cell division, cell polarity, cytoskeleton and thus leaf marginal patterning remains elusive. To this end, we make use of chromatin immunoprecipitation sequencing(ChIP-seq), transcriptomic, comparative genetics and advanced imaging approaches to identify the downstream regulating genes of ChCUC1.

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Heterochrony underpins natural variation in Cardamine hirsuta leaf form.

Project description: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.

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