Comparison of common cytotypesof Andropogon gerardii(Andropogoneae, Poaceae)
Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromo...
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| Veröffentlicht in: | American journal of botany 1999-07, Vol.86 (7), p.974-979 |
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| container_title | American journal of botany |
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| creator | Keeler, Kathleen H Davis, Geoffrey A |
| description | Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype was found to be larger and taller than the hexaploid (60 chromosome, 6x) cytotype. Seed production is significantly more efficient in hexaploids, but seed production per area was not significantly different. The two cytotypes are not exomorphologically separable in the field because of great plasticity in response to environmental variation and wide variation within each cytotype. These data suggest cytotypic variation is maintained by natural selection. |
| doi_str_mv | 10.2307/2656614 |
| format | Article |
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Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype was found to be larger and taller than the hexaploid (60 chromosome, 6x) cytotype. Seed production is significantly more efficient in hexaploids, but seed production per area was not significantly different. The two cytotypes are not exomorphologically separable in the field because of great plasticity in response to environmental variation and wide variation within each cytotype. 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Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype was found to be larger and taller than the hexaploid (60 chromosome, 6x) cytotype. Seed production is significantly more efficient in hexaploids, but seed production per area was not significantly different. The two cytotypes are not exomorphologically separable in the field because of great plasticity in response to environmental variation and wide variation within each cytotype. These data suggest cytotypic variation is maintained by natural selection.</description><subject>Andropogon gerardii</subject><subject>cytotype</subject><subject>enneaploid</subject><subject>hexaploid</subject><subject>Poaceae</subject><subject>polyploidy</subject><issn>0002-9122</issn><issn>1537-2197</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNp1kF1LwzAUhoMobk7xH8huRAWr-WqyXM7hJwO90OuQtqdbpF1qslH6783oYN54dc55eXg4vAidE3xHGZb3VKRCEH6AhiRlMqFEyUM0xBjTRBFKB-gkhO94Kq7oMRoQzLGQFA_RfObqxngb3GrsynHu6jpuebd2666BEKPpqvCucYsYL8AbX1h7vc_AwO34w5k8Ljen6Kg0VYCz3Ryhr6fHz9lLMn9_fp1N50lOU8WTlPPMQEZTnnEDphSQSgkkiz8xVmRAuTBGTRhPGUvJRGVEApOlMLgoJSaEjdBV7228-9lAWOvahhyqyqzAbYKeSMo5EYruydy7EDyUuvG2Nr7TBOttc3rXXCQvds5NVkPxh-urikDSA62toPvPo6dvDxQruRVe9vzSLpat9aBDbaoq6olu23YitNRb7hd4U4HH</recordid><startdate>19990701</startdate><enddate>19990701</enddate><creator>Keeler, Kathleen H</creator><creator>Davis, Geoffrey A</creator><general>Botanical Soc America</general><general>Botanical Society of America</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>19990701</creationdate><title>Comparison of common cytotypesof Andropogon gerardii(Andropogoneae, Poaceae)</title><author>Keeler, Kathleen H ; Davis, Geoffrey A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2594-544baeb254b4aeaf6e577e1b40633dbe246aa98345335189b17e37f6a0df70113</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Andropogon gerardii</topic><topic>cytotype</topic><topic>enneaploid</topic><topic>hexaploid</topic><topic>Poaceae</topic><topic>polyploidy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Keeler, Kathleen H</creatorcontrib><creatorcontrib>Davis, Geoffrey A</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>American journal of botany</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Keeler, Kathleen H</au><au>Davis, Geoffrey A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Comparison of common cytotypesof Andropogon gerardii(Andropogoneae, Poaceae)</atitle><jtitle>American journal of botany</jtitle><addtitle>Am J Bot</addtitle><date>1999-07-01</date><risdate>1999</risdate><volume>86</volume><issue>7</issue><spage>974</spage><epage>979</epage><pages>974-979</pages><issn>0002-9122</issn><eissn>1537-2197</eissn><abstract>Many plant species contain populations with more than one polyploid cytotype, but little is known of the mechanisms maintaining several cytotypes in a population. Andropogon gerardii cytotypes were compared to evaluate different models of autopolyploid cytotype coexistence. The enneaploid (90 chromosome, 9x) cytotype was found to be larger and taller than the hexaploid (60 chromosome, 6x) cytotype. Seed production is significantly more efficient in hexaploids, but seed production per area was not significantly different. The two cytotypes are not exomorphologically separable in the field because of great plasticity in response to environmental variation and wide variation within each cytotype. These data suggest cytotypic variation is maintained by natural selection.</abstract><cop>United States</cop><pub>Botanical Soc America</pub><pmid>10406720</pmid><doi>10.2307/2656614</doi><tpages>6</tpages></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete; JSTOR Archive Collection A-Z Listing; Wiley Free Content; EZB-FREE-00999 freely available EZB journals |
| subjects | Andropogon gerardii cytotype enneaploid hexaploid Poaceae polyploidy |
| title | Comparison of common cytotypesof Andropogon gerardii(Andropogoneae, Poaceae) |
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