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Collinsia rattanii

ABSTRACT: Collinsia rattanii overview

PROVIDER: PRJNA179024 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14514728_1.fastq.gz	Fastqsanger.gz
	SRR14514728_2.fastq.gz	Fastqsanger.gz
	SRR14514729_1.fastq.gz	Fastqsanger.gz
	SRR14514729_2.fastq.gz	Fastqsanger.gz
	SRR14514730_1.fastq.gz	Fastqsanger.gz

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New genomic resources and comparative analyses reveal differences in floral gene expression in selfing and outcrossing Collinsia sister species

Project description:We used flower bud transcriptomes from Collinsia rattanii and its predominantly outcrossing sister species, C. linearis, to explore the genomic basis of mating system and phenotypic evolution in Collinsia, a self-compatible genus. Transcriptional regulation of enzymes involved in pollen formation may influence floral traits that distinguish selfing and outcrossing Collinsia species through pleiotropic functions. These patterns provide clues about parallel evolution in selfing plants.

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Project description:Collinsia rattanii Transcriptome or Gene expression

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New genomic resources and comparative analyses reveal differences in floral gene expression in selfing and outcrossing Collinsia sister species

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New genomic resources and comparative analyses reveal differences in floral gene expression in selfing and outcrossing Collinsia sister species.

Project description:The evolutionary transition from outcross- to self-fertilization is one of the most common in angiosperms and is often associated with a parallel shift in floral morphological and developmental traits, such as reduced flower size and pollen to ovule ratios, known as the "selfing syndrome." How these convergent phenotypes arise, the extent to which they are shaped by selection, and the nature of their underlying genetic basis are unsettled questions in evolutionary biology. The genus Collinsia (Plantaginaceae) includes seven independent transitions from outcrossing or mixed mating to high selfing rates accompanied by selfing syndrome traits. Accordingly, Collinsia represents an ideal system for investigating this parallelism, but requires genomic resource development. We present a high quality de novo genome assembly for the highly selfing species Collinsia rattanii. To begin addressing the basis of selfing syndrome developmental shifts, we evaluate and contrast patterns of gene expression from floral transcriptomes across three stages of bud development for C. rattanii and its outcrossing sister species Collinsia linearis. Relative to C. linearis, total gene expression is less variable among individuals and bud stages in C. rattanii. In addition, there is a common pattern among differentially expressed genes: lower expression levels that are more constant across bud development in C. rattanii relative to C. linearis. Transcriptional regulation of enzymes involved in pollen formation specifically in early bud development may influence floral traits that distinguish selfing and outcrossing Collinsia species through pleiotropic functions. Future work will include additional Collinsia outcrossing-selfing species pairs to identify genomic signatures of parallel evolution.

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