THE DEVELOPMENTAL BASIS FOR SEXUAL EXPRESSION IN CERATONIA-SILIQUA (LEGUMINOSAE, CAESALPINIOIDEAE, CASSIEAE)

Authors
Citation
Sc. Tucker, THE DEVELOPMENTAL BASIS FOR SEXUAL EXPRESSION IN CERATONIA-SILIQUA (LEGUMINOSAE, CAESALPINIOIDEAE, CASSIEAE), American journal of botany, 79(3), 1992, pp. 318-327
Citations number
33
Language
INGLESE
art.tipo
Article
Journal title
ISSN journal
0002-9122
Volume
79
Issue
3
Year of publication
1992
Pages
318 - 327
Database
ISI
SICI code
0002-9122(1992)79:3<318:TDBFSE>2.0.ZU;2-Z
Abstract
The flowers of Ceratonia siliqua, an anomalous caesalpinioid legume in the tribe Cassieae, are unusual in being unisexual and in lacking pet als. Inflorescence development, organogeny, and flower development are described for this species. All flowers are originally bisexual, but one sex is suppressed during late development of functionally male and female flowers. Ceratonia siliqua is highly plastic in sexuality of i ndividuals, inflorescence branching pattern, racemose or cymose inflor escences, bracteole presence, terminal flower presence, organ number p er whorl, missing floral organs, pollen grain form, and carpel cleft o rientation. Order of initiation is: five sepals in helical order, then five stamens in helical order together with the carpel. Each stamen i s initiated as two alternisepalous primordia that fuse to become a con tinuous antesepalous ridge; in some flowers, the last one or two stame ns of the five may form as individual antesepalous mounds. Petal rudim ents are occasional in mature flowers. Position of organs is atypical: the median sepal is on the adaxial side in Ceratonia, rather than aba xial as in most other caesalpinioids. This feature in Ceratonia may be viewed as a link to subfamily Mimosoideae, in which this character st ate is constant.