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Abstract Detail

Reproductive Processes

Chae, Taylor [1], Harkess, Alex [2], Moore, Rich [3].

Sex-linked expression and sexual transitions in Carica papaya.

One path of the evolution of dioecy from hermaphroditism is via mutations at two loci, yet reversions to gynodioecy occur in some plants, including Carica papaya. Papaya has an XY chromosome system and hermaphrodites have a unique Y chromosome (Yh). The sex-determining regions of the Y and Yh chromosomes are nearly identical in nucleotide sequence; however, males and hermaphrodites differ morphologically. I predicted that the morphological differences and the sexual reversion are due to differentially expressed genes (DEGs). I conducted RNA-seq to identify DEGs during different floral developmental stages. Linkage Group 1 (the sex chromosome) was significantly enriched for DEGs compared to the other eleven linkage groups, and most of these genes were found in the pseudoautosomal regions (PAR). Sex-biased genes in papaya can be found on the PARs of the sex chromosomes and may serve as way to resolve sexually antagonistic loci.

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1 - Xavier University, Biology, 3800 Victory Parkway , Cincinnati, OH, 45207, USA
2 - 40 N Kingshighway Blvd Apt 07B, St. Louis, MO, 63108, United States
3 - 700 E. High St., 167G PSN, 212 Pearson Hall, Oxford, OH, 45056, United States

Sex Chromosomes
Sexual transitions

Presentation Type: Oral Paper
Session: REP2, Reproductive Processes 2
Location: San Luis 2/Starr Pass
Date: Wednesday, July 31st, 2019
Time: 1:30 PM
Number: REP2001
Abstract ID:785
Candidate for Awards:None

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