Carpel whorl

Simon Superman s role is to establish a boundary between stamen and carpel whorls (Sakai et al 1995). 

Goodwin Since the mutants you described are affecting stem cell fate, what is it that restricts the effects to the carpels Why don t we see effects on other whorls ... 

Many botanists believe that the four different whorls of a flower (sepals, petals, stamens, and carpels) origi-... 

A Typical or Complete Flower possesses four whorls of floral leaves arranged upon a more or less shortened stem axis called a receptacle, torus or thalamus. These whorls passing from periphery toward the center are calyx, composed of parts called sepals corolla, composed of parts termed petals andrcecitm, composed of parts called stamens or microsporopylls and gyncecium, composed of one or more parts termed carpels or megasporophylls. 

Connation and Adnation.—In the development of the flowers of primitive species of flowering plants, the parts of each whorl are disjoined or separate from each other. In many higher types, however, the parts of the same whorl frequently become partly or completely united laterally. This condition is termed connation, coalescence, cohesion or s)mgenesis. Illustrations of this ihay be seen in Belladonna, Stramonium and Uva Ursi flowers, where the petals have joined laterally to form gamopetalous corollas. When the one or more parts of different whorls are united, as of stamens with petals Rhammus) or stamens with carpels Apocynum) the union is called adnation or adhesion. 

C mRNAs in each whorl (W1, W2, W3, W4). The observed floral organ in each whorl is indicated as follows sepal = se petals = pe stamens = st and carpels = ca. See text for discussion. 

Carpel number I I One carpel I I 2-5 carpels in one whorl (series) H >5 carpels in one whorl H More than one whorl... 

The discovery that in A. celastrifolia carpel initiation starts before the last stamens are formed, confirms Endress (1994, p. 103) observation that early carpel initiation is a characteristic of species in which stamens are formed on a ringlike androecial mound. However, early carpel formation is also frequently found in Papilionoideae with only ten stamens in two whorls (e.g. Daviesia cordata, Prenner, 2004d) and in Caesalpinioideae (c.f. Prenner and Klitgaard, 2008). 

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