Size-Dependent Gender Change in Green Dragon (Arisaema dracontium; Araceae)
1993; Wiley; Volume: 80; Issue: 7 Linguagem: Holandês
10.2307/2445597
ISSN1537-2197
Autores Tópico(s)Botanical Research and Applications
ResumoAmerican Journal of BotanyVolume 80, Issue 7 p. 769-777 Reproductive Biology SIZE-DEPENDENT GENDER CHANGE IN GREEN DRAGON (ARISAEMA DRACONTIUM; ARACEAE) Keith Clay, Keith Clay Department of Biology, Indiana University, Bloomington, Indiana, 47405Search for more papers by this author Keith Clay, Keith Clay Department of Biology, Indiana University, Bloomington, Indiana, 47405Search for more papers by this author First published: 01 July 1993 https://doi.org/10.1002/j.1537-2197.1993.tb15293.xCitations: 19AboutPDF 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 Green dragon (Arisaema dracontium; Araceae) is a perennial woodland herb capable of switching gender from year to year. Small flowering plants produce only male flowers but when larger they produce male and female flowers simultaneously. Distinct male and monoecious phenotypes (referred to hereafter as plants) share a single underlying cosexual genotype. Four populations in southern Louisiana were sampled to determine frequencies and size distributions of male and monoecious plants, and to determine the relationship of plant size with male and female flower production in monoecious plants. Male plants were significantly smaller than monoecious plants and made up 34%–78% of flowering plants within populations. Flower number (average = 120) was weakly positively correlated with size. Monoecious plants produced an average of 169 flowers (90 female) and had 100% fruit set, with individual berries containing an average of 2.5 ovules and 1.3 filled seeds. Male flower number was negatively correlated, and female flower number positively correlated, with basal stem diameter. Extrapolation of regression slopes suggested that green dragon should become completely female at a size 20% larger than the largest plant observed in this study. A simple model of inflorescence development is presented to illustrate how the reproductive system of green dragon is related to that of jack-in-the-pulpit (A. tnphyllum), which exhibits a more distinct switch between male and female phenotypes. Citing Literature Volume80, Issue7July 1993Pages 769-777 RelatedInformation
Referência(s)