CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Australian Journal of Botany   
Australian Journal of Botany
Journal Banner
  Southern Hemisphere Botanical Ecosystems
 
blank image Search
 
blank image blank image
blank image
 
  Advanced Search
   

Journal Home
About the Journal
Editorial Board
Contacts
Content
Current Issue
Just Accepted
All Issues
Special Issues
Turner Review Series
Sample Issue
For Authors
General Information
Notice to Authors
Submit Article
Open Access
For Referees
Referee Guidelines
Review Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube

red arrow PrometheusWiki
blank image
PrometheusWiki
Protocols in ecological and environmental plant physiology

 

Article << Previous     |     Next >>   Contents Vol 36(5)

Floral Initiation and Development in Helipterum roseum (Hook.) Benth. And Helichrysum bracteatum (Vent.) Andrews (Asteraceae)

KV Sharman and M Sedgley

Australian Journal of Botany 36(5) 575 - 587
Published: 1988

Abstract

Floral initiation and development in Helichrysum bracteatum and Helipterum roseum were investigated by scanning electron microscopy. The sequence of events in these two species was similar and occurred rapidly. Seven stages in apical development were identified, which were distinctive in both appearance and size. Stage 1 was a small vegetative meristem with 2-4 leaf primordia. Stage 2 (also vegetative) was characterized by a doubling in both height and diameter. A doming of the apical meristem signified the commencement of stage 3, and at the appearance of the first involucral bracts (stage 4) the apex had further tripled in height and doubled in diameter. This was followed by the appearance of floret primordia (stage 5). By the time the inflorescence buds were visible to the naked eye (stage 6) several rows of florets were present, and at anthesis (stage 7) the capitulum was covered with florets. During the transition from stage 4 to stage 5 a few developing primordia appeared to divide. The lower portion developed into a small involucral bract and the upper portion into a floret. The florets developed centripetally such that a range of developmental stages was present on the capitulum. The development of the individual florets involved the differentiation of perianth, anther, pistil and pappus hairs. Stage 4 was considered the point at which the apex was committed to flower.



Full text doi:10.1071/BT9880575

© CSIRO 1988

blank image
Subscriber Login
Username:
Password:  

 
PDF (1.2 MB) $25
 Export Citation
 Print
  
    
Legal & Privacy | Contact Us | Help

CSIRO

© CSIRO 1996-2014