Dec 28, 2017

Incidence and developmental timing of endosperm failure in post-zygotic isolation between wild tomato lineages

Annals of Botany
Morgane RothThomas Städler

Abstract

Defective hybrid seed development in angiosperms might mediate the rapid establishment of intrinsic post-zygotic isolation between closely related species. Extensive crosses within and among three lineages of wild tomatoes (Solanum section Lycopersicon) were performed to address the incidence, developmental timing and histological manifestations of hybrid seed failure. These lineages encompass different, yet fairly recent, divergence times and both allopatric and partially sympatric pairs. Mature seeds were scored visually 2 months after hand pollinations, and viable-looking seeds were assessed for germination success. Using histological sections from early-developing seeds from a sub-set of crosses, the growth of three major seed compartments (endosperm, embryo and seed coat) was measured at critical developmental stages up to 21 d after pollination, with a focus on the timing and histological manifestations of endosperm misdevelopment in abortive hybrid seeds. For two of three interspecific combinations including the most closely related pair that was also studied histologically, almost all mature seeds appeared 'flat' and proved inviable; histological analyses revealed impaired endosperm proliferation at early globular embry...Continue Reading

  • References42
  • Citations5

References

Mentioned in this Paper

Seed Development
Embryo
Necrosis
Entire Embryo
Plant Breeding
Genus Solanum
Tomatoes
Germination
Flat Shape
Solanum nigrum

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