A transposon-mediate inactivation of a CYCLOIDEA-like gene originates polysymmetric and androgynous ray flowers in Helianthus annuus.

Genetica
Marco FambriniClaudio Pugliesi

Abstract

In several eudicots, including members of the Asteraceae family, the CYCLOIDEA (CYC) genes, which belong to the TCP class of transcription factors, are key players for floral symmetry. The sunflower inflorescence is heterogamous (radiate capitulum) with sterile monosymmetric ray flowers located in the outermost whorl of the inflorescence and hermaphrodite polysymmetric disk flowers. In inflorescence of Heliantheae tribe, flower primordia development initiates from the marginal ray flowers while disk flowers develop later in an acropetal fashion in organized parastichies along a number found to be one of Fibonacci patterns. Mutants for inflorescence morphology can provide information on the role of CYC-like genes in radiate capitulum evolution. The tubular ray flower (turf) mutant of sunflower shows hermaphrodite ray flowers with a nearly polysymmetric tubular-like corolla. Here, we demonstrate that this mutation is caused by the insertion in the TCP motif of a sunflower CYC-like gene (HaCYC2c) of non-autonomous transposable element (TE), belonging to the CACTA superfamily of transposons. We named this element Transposable element of turf1 (Tetu1). The Tetu1 insertion changes the reading frame of turf-HaCYC2c for the encoded pro...Continue Reading

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Citations

Jun 25, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Lena C Hileman
Jun 14, 2014·The Plant Journal : for Cell and Molecular Biology·Inka Juntheikki-PalovaaraPaula Elomaa
Feb 11, 2014·Current Opinion in Plant Biology·Lena C Hileman
Jan 21, 2014·Genesis : the Journal of Genetics and Development·Marco FambriniClaudio Pugliesi
Mar 20, 2020·International Journal of Molecular Sciences·Maria VentimigliaFlavia Mascagni
Nov 25, 2020·Genesis : the Journal of Genetics and Development·Marco FambriniClaudio Pugliesi
Dec 8, 2020·Genesis : the Journal of Genetics and Development·Marco FambriniClaudio Pugliesi

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