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Genomics of Papaya Sex Chromosomes

  • Robert VanBuren
  • Ray Ming
Chapter
Part of the Plant Genetics and Genomics: Crops and Models book series (PGG, volume 10)

Abstract

Unlike most flowering plants, papaya is trioecious with separate male, female, and hermaphrodite trees. Sex determination in papaya is controlled by a pair of nascent sex chromosomes. Female papaya plants have two X chromosomes, and male and hermaphrodite papayas have an XY chromosome pair. There are two slightly different Y chromosomes: Y controlling male and Yh controlling hermaphrodite sex. Sequencing of the papaya sex chromosomes was recently completed, shedding light on the early events in sex chromosome evolution. The hermaphrodite-specific region of the Y chromosome (HSY) has expanded drastically in comparison to its X counterpart, mostly due to retrotransposons and other repetitive elements. Gene trafficking, loss, and degradation are a prominent feature of the HSY, despite its young evolutionary age. Two large-scale inversions were detected in the HSY, resulting in suppression of recombination and subsequent fixation of sex chromosomes. In this chapter, the genetics and genomics of the papaya sex chromosomes are discussed, as well as the major findings from the recently completed X and HSY sequences.

Keywords

Simple Sequence Repeat Marker Collinear Region Papaya Genome Repeat Accumulation Knob Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Plant BiologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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