Document Detail

Clonal integration and its ecological significance in Hedysarum laeve, a rhizomatous shrub in Mu Us Sandland.
MedLine Citation:
PMID:  12884134     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Hedysarum laeve, a rhizomatous clonal half-shrub, commonly dominates in inland dunes in semiarid areas of northern China. This species propagates vegetatively by the extension of horizontal rhizomes resulting in programmed reiteration of apical and/or axillary meristems. In this study, (14)C labeling and experimental defoliation were employed to test the photosynthate translocation within the interconnected parent-daughter ramet pairs. A proportion of (14)C-photosynthates was transported from the parent ramet into the daughter ramet, the roots of the daughter ramet, and the rhizome; these three components showed more than 70% sink activity after 24-h translocation. On the other hand, the basipetal translocation (from daughter ramet into parent ramet) was relatively small with sink activity of less than 5%, but sink activity of the rhizome exceeded 10%. Defoliation had an influence on the photosynthate translocation between parent and daughter ramets. The intact parent ramets significantly increased their (14)C-photosynthate translocation into defoliated daughter ramets when compared to intact daughter ramets. The daughter ramets transported significantly more (14)C-photosynthates to the defoliated parent ramets than to the intact parent ramets. A portion of (14)C-photosynthates was transported into the rhizome from both parent and daughter ramets, indicating that the rhizome is supported by both ramets for photosynthates. The clonal integration between ramets of the species through rhizome connection may confer benefit both to the ramets and the genet in adverse environments.
Chengyi Zhang; Chi Yang; Ming Dong
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of plant research     Volume:  115     ISSN:  0918-9440     ISO Abbreviation:  J. Plant Res.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2003-07-28     Completed Date:  2003-11-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9887853     Medline TA:  J Plant Res     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  113-8     Citation Subset:  -    
Xiang shan, Nan Xin cun, 20, Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Science, Beijing 100093, P. R. China.
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