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- ABC_model_of_flower_development abstract "Flower development is the process by which angiosperms produce a pattern of gene expression in meristems that leads to the appearance of an organ oriented towards sexual reproduction, a flower. There are three physiological developments that must occur in order for this to take place: firstly, the plant must pass from sexual immaturity into a sexually mature state (i.e. a transition towards flowering); secondly, the transformation of the apical meristem’s function from a vegetative meristem into a floral meristem or inflorescence; and finally the growth of the flower’s individual organs. The latter phase has been modelled using the ABC model, which endeavours to describe the biological basis of the process from the perspective of molecular and developmental genetics.An external stimulus is required in order to trigger the differentiation of the meristem into a flower. This stimulus will activate mitotic cell division in the meristem, particularly on its sides where new primordia are formed. This same stimulus will also cause the meristem to follow a developmental pattern that will lead to the growth of floral meristems as opposed to vegetative meristems. The main difference between these two types of meristem, apart from the obvious disparity between the objective organ, is the verticillate (or whorled) phyllotaxis, that is, the absence of stem elongation among the successive whorls or verticils of the primordium. These verticils follow an acropetal development, giving rise to sepals, petals, stamens and carpels. Another difference from vegetative axillary meristems is that the floral meristem is «determined», which means that, once differentiated, its cells will no longer divide.The identity of the organs present in the four floral verticils is a consequence of the interaction of at least three types of gene products, each with distinct functions. According to the ABC model, functions A and C are required in order to determine the identity of the verticils of the perianth and the reproductive verticils, respectively. These functions are exclusive and the absence of one of them means that the other will determine the identity of all the floral verticils. The B function allows the differentiation of petals from sepals in the secondary verticil, as well as the differentiation of the stamen from the carpel on the tertiary verticil.Goethe’s «foliar theory» was formulated in the 18th century and it suggests that the constituent parts of a flower are structurally modified leaves, which are functionally specialized for reproduction or protection. The theory was first published in 1790 in the essay "Metamorphosis of Plants" ("Versuch die Metamorphose der Pflanzen zu erklaren"). where Goethe wrote:"...we may equally well say that a stamen is a contracted petal, as that a petal is a stamen in a state of expansion; or that a sepal is a contracted stem leaf approaching a certain stage of refinement, as that a stem leaf is a sepal expanded by the influx of cruder saps".".
- ABC_model_of_flower_development thumbnail ABC_flower_development.svg?width=300.
- ABC_model_of_flower_development wikiPageExternalLink Chapter_12C.html.
- ABC_model_of_flower_development wikiPageExternalLink flower3.htm.
- ABC_model_of_flower_development wikiPageID "3160065".
- ABC_model_of_flower_development wikiPageRevisionID "596713891".
- ABC_model_of_flower_development hasPhotoCollection ABC_model_of_flower_development.
- ABC_model_of_flower_development subject Category:Plant_morphology.
- ABC_model_of_flower_development comment "Flower development is the process by which angiosperms produce a pattern of gene expression in meristems that leads to the appearance of an organ oriented towards sexual reproduction, a flower. There are three physiological developments that must occur in order for this to take place: firstly, the plant must pass from sexual immaturity into a sexually mature state (i.e.".
- ABC_model_of_flower_development label "ABC model of flower development".
- ABC_model_of_flower_development label "ABCモデル".
- ABC_model_of_flower_development label "ABC模型".
- ABC_model_of_flower_development label "Controle do florescimento".
- ABC_model_of_flower_development label "Desarrollo floral".
- ABC_model_of_flower_development label "Modello ABC di sviluppo fiorale".
- ABC_model_of_flower_development label "Развитие цветка".
- ABC_model_of_flower_development sameAs Desarrollo_floral.
- ABC_model_of_flower_development sameAs Modello_ABC_di_sviluppo_fiorale.
- ABC_model_of_flower_development sameAs ABCモデル.
- ABC_model_of_flower_development sameAs Controle_do_florescimento.
- ABC_model_of_flower_development sameAs m.08w7w6.
- ABC_model_of_flower_development sameAs Q2528776.
- ABC_model_of_flower_development sameAs Q2528776.
- ABC_model_of_flower_development wasDerivedFrom ABC_model_of_flower_development?oldid=596713891.
- ABC_model_of_flower_development depiction ABC_flower_development.svg.
- ABC_model_of_flower_development isPrimaryTopicOf ABC_model_of_flower_development.