Dynamic nectar replenishment in flowers of Penstemon (Scrophulariaceae)
Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinators. A limited degree of such nectar homeostasis...
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| Veröffentlicht in: | American journal of botany 2002-01, Vol.89 (1), p.111-118 |
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| container_title | American journal of botany |
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| creator | Castellanos, Maria Clara Wilson, Paul Thomson, James D. |
| description | Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinators. A limited degree of such nectar homeostasis is reported here for Penstemon. First, nectar removal stimulates replenishment: when nectar was removed hourly for 6 h from P. speciosus. twice as much nectar was secreted cumulatively as when nectar was removed only at the beginning and end of the same 6-h period. Second, replacing artificial nectar in the nectaries of P. speciosus prevents replenishment. Third, the hummingbird-adapted P. barbatus made more nectar before leveling off than the bee-adapted P. strictus. Our work and previous studies with other plants imply mechanisms for dynamic regulation of nectar offerings, at least within broad limits. We speculate about the proximate physiology underlying this behavior and its evolutionary significance. |
| doi_str_mv | 10.3732/ajb.89.1.111 |
| format | Article |
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Wilson, Paul ; Thomson, James D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4781-e69e9bf4e539cdf073a5419d9b74502f51549126c0b2aae393cca57fd43456d63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Adaptation</topic><topic>Ecology</topic><topic>Flowers</topic><topic>Flowers & plants</topic><topic>homeostasis</topic><topic>Nectar</topic><topic>nectar replenishment</topic><topic>nectar resecretion</topic><topic>Nectar secretion</topic><topic>Nectaries</topic><topic>nectary</topic><topic>Penstemon</topic><topic>Physiological regulation</topic><topic>Plant reproduction</topic><topic>Plants</topic><topic>Pollen</topic><topic>Pollinating insects</topic><topic>pollination</topic><topic>Scrophulariaceae</topic><topic>Secretion</topic><topic>Sugars</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Castellanos, Maria Clara</creatorcontrib><creatorcontrib>Wilson, Paul</creatorcontrib><creatorcontrib>Thomson, James D.</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Bacteriology Abstracts (Microbiology B)</collection><collection>Ecology Abstracts</collection><collection>Entomology Abstracts (Full archive)</collection><collection>Environment Abstracts</collection><collection>Virology and AIDS Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>Genetics Abstracts</collection><collection>Environment Abstracts</collection><collection>MEDLINE - Academic</collection><jtitle>American journal of botany</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Castellanos, Maria Clara</au><au>Wilson, Paul</au><au>Thomson, James D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dynamic nectar replenishment in flowers of Penstemon (Scrophulariaceae)</atitle><jtitle>American journal of botany</jtitle><addtitle>Am J Bot</addtitle><date>2002-01-01</date><risdate>2002</risdate><volume>89</volume><issue>1</issue><spage>111</spage><epage>118</epage><pages>111-118</pages><issn>0002-9122</issn><eissn>1537-2197</eissn><coden>AJBOAA</coden><abstract>Plants that experience variation in pollinator visitation rates or fluctuations in weather conditions may be expected to have evolved homeostatic mechanisms that regulate their nectar offerings, thereby providing a more constant reward to the pollinators. 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| subjects | Adaptation Ecology Flowers Flowers & plants homeostasis Nectar nectar replenishment nectar resecretion Nectar secretion Nectaries nectary Penstemon Physiological regulation Plant reproduction Plants Pollen Pollinating insects pollination Scrophulariaceae Secretion Sugars |
| title | Dynamic nectar replenishment in flowers of Penstemon (Scrophulariaceae) |
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