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Floral emasculation reveals pollen quality limitation of seed output in Bulbine bulbosa (Asphodelaceae)1.
MedLine Citation:
PMID:  21622377     Owner:  NLM     Status:  In-Data-Review    
Pollen commonly limits seed output in natural plant populations, but the relative contributions of pollen quantity and quality to pollen limitation remain largely unexplored. Estimates of these contributions are needed to promote better understanding of the ecological and evolutionary consequences of pollen limitation. We assessed pollen limitation and distinguished how pollen quantity and quality contributed to seed output in the predominantly outcrossing herb Bulbine bulbosa. We compared seed output of emasculated and cross-pollinated plants that could not self-pollinate with that of intact plants. Seed output was similar in emasculated and cross-pollinated plants, but it was about 50% less in intact plants. These findings indicate that the quantity of cross-pollen deposited by pollinators did not limit seed output. However, pollinators also deposited self-pollen, which reduced seed output because selfing disabled ovules, rendering them unavailable for cross-fertilization. We conclude that pollen quality rather than quantity can limit seed output under natural conditions, which supports recent proposals for greater consideration of pollen quality in the study of pollen limitation.
Glenda Vaughton; Mike Ramsey
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of botany     Volume:  97     ISSN:  0002-9122     ISO Abbreviation:  Am. J. Bot.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2011-05-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370467     Medline TA:  Am J Bot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  174-8     Citation Subset:  -    
Botany, University of New England, Armidale, NSW 2351, Australia.
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