Helical Floral Organogenesis in Gleditsia, a Primitive Caesalpinioid Legume
1991; Wiley; Volume: 78; Issue: 8 Linguagem: Italiano
10.2307/2444901
ISSN1537-2197
Autores Tópico(s)Plant Diversity and Evolution
ResumoAmerican Journal of BotanyVolume 78, Issue 8 p. 1130-1149 Article HELICAL FLORAL ORGANOGENESIS IN GLEDITSIA, A PRIMITIVE CAESALPINIOID LEGUME Shirley C. Tucker, Shirley C. Tucker Department of Botany, Louisiana State University, Baton Rouge, Louisiana, 70803Search for more papers by this author Shirley C. Tucker, Shirley C. Tucker Department of Botany, Louisiana State University, Baton Rouge, Louisiana, 70803Search for more papers by this author First published: 01 August 1991 https://doi.org/10.1002/j.1537-2197.1991.tb14520.xCitations: 33AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract In order to determine the extent of floral ontogenetic differences among species of a genus, six species of Gleditsia were studied. Gledilsia is one of only two leguminous genera known in which there is completely helical succession of floral organs. Floral ontogeny was compared in three species (Gleditsia amorphoides, G. aquatica, and G. triacanthos), and late stages in six species (including the first three plus G. caspica, G. delavayi, and G. japonica). Other unusual primitive developmental features include the unequal-sized flower primordia which produce flowers of variable merosity. Order of floral development is also loosely controlled, so that flowers of different growth stages are intermixed in the inflorescence. Variable features include the occurrence of floral bracts, merosity of flowers, number of organs, and position of the first organ (sepal) initiated. The inflorescence type, while usually a raceme, often has lateral branches near the base, or fascicles of flowers at some points. A terminal flower often is present, although not in all species. Sex of flowers and inflorescences also varies, although floral initiation tends to include both stamens and carpel primordia. Suppression of one or the other may occur at different stages of development. Carpel orientation also varies; the cleft may be tilted or inverted occasionally. It is proposed that absence of subtending floral bracts influences development so as to favor radial symmetry and establishment of other "chaotic" characters seen in Gledilsia flowers. Citing Literature Volume78, Issue8August 1991Pages 1130-1149 RelatedInformation
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