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Ecological Section

Kaczorowski, Rainee L. [1], Holtsford, Timothy P. [1].

Heritability and genetic correlation of nectar and floral traits in Nicotiana alata.

Certain nectar traits in species of Nicotiana Section Alatae exhibit significant variation, often in association with the pollination system. Pollinator-mediated selection on nectar traits could be possible if the observed variation affected fitness and was heritable. Preliminary experiments that examined nectar traits in hybrids of Nicotiana alata and N. forgetiana suggested that nectar traits exhibit some degree of heritability, at least in interspecific crosses. Nicotiana alata and N. forgetiana differ significantly in their nectar and floral traits, but floral and nectar traits are correlated and pleiotropic effects may be present. Genetic correlations could elucidate the degree to which pleiotropy links nectar and floral traits. Genetic correlations and heritability are being estimated for floral and nectar traits in N. alata using intraspecific crosses from a partial diallel design. Traits examined include nectar volume and concentration, in addition to corolla tube length, limb width, and mouth diameter. The full-scale experiment was conducted at an experimental plot in Missouri, while a small-scale experiment was conducted at an experimental plot in Brazil, near natural populations of N. alata. Preliminary analysis of a partial data set suggests significant heritability and genetic correlations are present.


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1 - University of Missouri-Columbia, Biological Sciences, 105 Tucker Hall, Columbia, Missouri, 65211, USA

Keywords:
heritability
genetic correlation
nectar traits
floral traits
Nicotiana.

Presentation Type: Oral Paper
Session: 37-6
Location: Salon A - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 3:15 PM
Abstract ID:299


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