Abstract
For a long time, Amaryllidaceae were a textbook example of monopodially growing bulbs. The position of the first leaf of the innovation bud in Galanthus, which is not adaxial in relation to the inflorescence, was the main argument in favor of this. The discussion about the type of bulb innovation continued over 150 years and was completed with the approval of a sympodial innovation model. The relevance of this study is due to the fact that no satisfactory explanation of the variability of phyllotaxis in the innovation bud of Amaryllidaceae has been found. We have carried out a homologization of innovation-bud prophylls in different clades of this family. Using the methods of comparative structural morphology, we have detected the universality of sympodial model of bulb innovation for the Amaryllidaceae family. Our study proves that the prophyll of the innovation bud can undergo a reduction from a well-developed green leaf through lower scales to completely ablasted (phantom) organs. We have established that the traits of prophyll structure are synapomorphies for large geographic clades of Amaryllidaceae allocated according to molecular phylogenetic data. We register the highest variability of the prophyll structure for African Amaryllidaceae. It is important to note that a row of morphological reduction of the prophyll (that we identify) cannot be considered evolutionary. Apparently, a polymorphic state with different degree of the prophyll development can be taken as ancestral, while the fixation of the prophyll traits has occurred in the course of further evolution for most large clades (except for African). Thus, in our study the fairness of the sympodial model of bulb innovation has finally been proven for the whole Amaryllidaceae family.
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Choob, V.V. Sympodial Model of Bulb Growth in Amaryllidaceae: A Comparative Morphological Approach. Contemp. Probl. Ecol. 13, 237–247 (2020). https://doi.org/10.1134/S199542552003004X
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DOI: https://doi.org/10.1134/S199542552003004X