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Genetic variation and phenotypic tra...

Bergum, Karin E.

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Genetic variation and phenotypic traits of Sporobolus airoides from invaded and noninvaded areas after two generations of greenhouse seed increase.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Genetic variation and phenotypic traits of Sporobolus airoides from invaded and noninvaded areas after two generations of greenhouse seed increase./
作者:	Bergum, Karin E.
面頁冊數:	72 p.
附註:	Source: Masters Abstracts International, Volume: 48-05, page: 2815.
Contained By:	Masters Abstracts International48-05.
標題:	Biology, Botany. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1476859
ISBN:	9781124020877

Genetic variation and phenotypic traits of Sporobolus airoides from invaded and noninvaded areas after two generations of greenhouse seed increase.
Bergum, Karin E.

Genetic variation and phenotypic traits of Sporobolus airoides from invaded and noninvaded areas after two generations of greenhouse seed increase. - 72 p.

Source: Masters Abstracts International, Volume: 48-05, page: 2815.

Thesis (M.S.)--University of Wyoming, 2009.

The impacts of exotic plant invasions on recipient native grass communities are not well known. Remnant native plants under selective pressures from exotic invasions may develop an increased resilience against invasive species and provide desirable seed source for restoration and native plant production. Sporobolus airoides Torr. (Alkali sacaton) collected from within long-term invaded areas of Acroptilon repens (L.) DC (Russian knapweed) and from adjacent noninvaded areas were propagated for two generations in a greenhouse to evaluate their genetic diversity and phenotypic traits. Given the difference in invasion history of the two sub-populations, we hypothesized invaded (IN) and noninvaded (OUT) sub-populations would differ genetically and phenotypically. Phenotypic traits of the IN sub-population had greater vegetative growth, whereas the OUT sub-population had increased sexual reproduction. Phenotypic expression, especially seed production within the INs, differed from the first generation to the second generation. AFLP methods were used to estimate genetic variation within and among locations (populations), sub-populations (INs, OUTs), and generations. Expected heterozygosity of the INs was greater in the first generation than the second generation, but the reverse was true for the OUTs. Genetic diversity of both IN and OUT sub-populations was partitioned within locations rather than among locations. Most genetic variation occurred among individuals within a sub-population (95.0%) or location (93.7%) and only 5.0-6.3% of the total genetic diversity was due to differences between sub-populations or among locations. Within each location, differences between INs and OUTs accounted for 5.9-8.0% of the genetic variation. Compared to other self-pollinating, perennial species, S. airoides was less genetically variable between locations or sub-populations. Higher intra-population genetic variation suggests S. airoides has a mixed breeding system (both self- and cross-pollinating) that may allow for more open gene flow even in small, fragmented populations. Polyploidism could have increased intra-population genetic diversity via fixed heterozygosity within S. airoides populations and the collection methods of maternal plants from the field may have exaggerated heterozygosity estimates. Generational differences in INs could become more pronounced in future generations if individuals are allowed to cross-pollinate. Seed increase efforts for S. airoides within a greenhouse must understand the potential for genetic shifts associated with out-crossing. Producers need to be aware bringing together plants from different locations creates new populations since cross-pollination appears to be more common than previously thought. Our study demonstrates remnant natives posses valuable traits for restoration and production environments can alter phenotypic expression and influence genetic diversity in only a few generations.

ISBN: 9781124020877Subjects--Topical Terms:

1017825
Biology, Botany.

Genetic variation and phenotypic traits of Sporobolus airoides from invaded and noninvaded areas after two generations of greenhouse seed increase.
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