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139 results
  • What is the nature of petals in Caryophyllaceae? Developmental evidence clarifies their evolutionary origin. [Journal Article]
  • ABAnn Bot 2019 Jun 05
  • Wei L, Craene LR
  • CONCLUSIONS: Developmental evidence and character mapping reject the hypothesis that petaloids represent a staminodial whorl and suggest that they are independent structures equivalent to second-whorl petals of most Pentapetalae and present in the basal Caryophyllaceae. Heterochronic shifts, including a delay in petal development and acceleration of androecial growth, are responsible for the amalgamation of petals with the androecium as common stamen-petal primordia and their appearance as stamen-derived appendages. Selective pollinator pressure in Caryophyllaceae led to variable petal expansion or reduction and loss. This trend corresponds largely with the general tendency in the core Caryophyllales for petal loss and perianth reorganization.
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