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RAS BiologyОнтогенез Russian Journal of Developmental Biology

  • ISSN (Print) 0475-1450
  • ISSN (Online) 3034-6266

What Spontaneous Floral Variations Reveal About the Regulation of Flower Development

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PII
S3034626625040014-1
DOI
10.7868/S3034626625040014
Publication type
Article
Status
Published
Authors
A.A. Sinjushin
  • Affiliation: Institute of Field and Vegetable Crops, Maksima Gorkog
Volume/ Edition
Volume 56 / Issue number 4
Pages
131-142
Abstract
The regularities of floral development can be studied by analyzing spontaneous variation in flowers observed at both the intraspecific and within-individual levels. In the case of floral organs arranged in a whorl, their number (merism) can vary due to fluctuations in the size of the floral meristem and its proliferation rate. One source of meristic variation is the architecture of the inflorescence: flowers with different structures may belong to different branching orders, and the true terminal flower tends to exhibit lower stability. The variability of the abaxial and adaxial floral domains is unequal. For example, in the monosymmetric corolla of Leguminosae, the adaxial petal is the most stable, which aligns with its evolutionary conservatism within the family. A higher frequency of spontaneous variation in the androccium, compared to other floral whorls, is hypothesized to follow the general biological rule that later-developing structures tend to be more variable. Correlations among the number of organs in different floral whorls can help identify the principles of floral patterning. In some taxa, the position of organs in each whorl is influenced by the position of the preceding whorl (acropetal patterning). In other lineages, the arrangement of stamens is influenced by the gynoccium (basipetal patterning of the androccium). The inner androccial whorl can be patterned under the influence of the gynoccium, whereas the number and position of outer stamens are determined by the perianth. In cases of spontaneous floral fluctuation, whorls that are coordinated in terms of patterning exhibit a higher correlation in their merism.
Keywords
актиноморфия меристические изменения мерность зитоморфия разметка симметрия цветка флуктуационная изменчивость эволюция
Date of publication
11.06.2025
Year of publication
2025
Number of purchasers
0
Views
83

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