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A transcriptome screen for positive selection in domesticated breadfruit and its wild relatives (Artocarpus spp.)
Kristen M Laricchia1,2, Matthew G Johnson2, Diane Ragone3
1Program in Plant Biology and Conservation, Northwestern University, Evanston, IL, 60208, USA.
American Journal of Botany
|June 9, 2018
Summary
Researchers identified over 1000 genes under positive selection in breadfruit (Artocarpus altilis), including key genes for fruit development and nutrition. This study provides valuable genomic resources for improving this underutilized crop for global food security.
Area of Science:
- Plant genomics
- Crop domestication
- Food security
Background:
- Underutilized crops like breadfruit (Artocarpus altilis) offer potential solutions for global food security.
- Breadfruit has undergone artificial selection for thousands of years, leading to diverse cultivars.
Purpose of the Study:
- Identify transcriptomic signals of positive selection in breadfruit.
- Develop genomic resources to aid in breeding improved breadfruit cultivars.
Main Methods:
- Assembled and annotated a reference breadfruit transcriptome.
- Generated and analyzed 24 transcriptomes from breadfruit and wild relatives.
- Focused on MADS-box and carotenoid biosynthesis genes.
Main Results:
- Over 1000 genes showed signals of positive selection, enriched in plastids.
- Positive selection identified in MADS-box and carotenoid biosynthesis genes, including abscisic acid 8'-hydroxylase 3.
- Specific nucleotide sites and individuals under selection were pinpointed within important gene domains.
Conclusions:
- Highlights genes selected during human-mediated breadfruit dispersal.
- Emphasizes the importance of conserving diverse breadfruit germplasm.
- Provides candidate genes and genomic resources for future breadfruit improvement.
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