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Open AccessArticle

Transcriptional Structure of Petunia Clock in Leaves and Petals

Genética Molecular, Instituto de Biotecnología Vegetal, Edificio I+D+I, Plaza del Hospital s/n, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain
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Genes 2019, 10(11), 860; https://doi.org/10.3390/genes10110860
Received: 23 September 2019 / Revised: 25 October 2019 / Accepted: 28 October 2019 / Published: 30 October 2019
(This article belongs to the Special Issue Genetic Mechanisms Underpinning Floral Architecture)
The plant circadian clock coordinates environmental signals with internal processes including secondary metabolism, growth, flowering, and volatile emission. Plant tissues are specialized in different functions, and petals conceal the sexual organs while attracting pollinators. Here we analyzed the transcriptional structure of the petunia (Petunia x hybrida) circadian clock in leaves and petals. We recorded the expression of 13 clock genes in petunia under light:dark (LD) and constant darkness (DD). Under light:dark conditions, clock genes reached maximum expression during the light phase in leaves and the dark period in petals. Under free running conditions of constant darkness, maximum expression was delayed, especially in petals. Interestingly, the rhythmic expression pattern of PhLHY persisted in leaves and petals in LD and DD. Gene expression variability differed among leaves and petals, time of day and photoperiod. The transcriptional noise was higher especially in leaves under constant darkness. We found that PhPRR7, PhPRR5, and PhGI paralogs showed changes in gene structure including exon number and deletions of CCT domain of the PRR family. Our results revealed that petunia petals presented a specialized clock. View Full-Text
Keywords: flower development; circadian clock; entrainment of circadian rhythm; petal; Solanaceae; tissue specific; transcriptional noise flower development; circadian clock; entrainment of circadian rhythm; petal; Solanaceae; tissue specific; transcriptional noise
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Terry, M.I.; Carrera-Alesina, M.; Weiss, J.; Egea-Cortines, M. Transcriptional Structure of Petunia Clock in Leaves and Petals. Genes 2019, 10, 860.

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