J
Joseph H. Williams
Researcher at University of Tennessee
Publications - 41
Citations - 1930
Joseph H. Williams is an academic researcher from University of Tennessee. The author has contributed to research in topics: Pollen & Pollen tube. The author has an hindex of 22, co-authored 40 publications receiving 1774 citations. Previous affiliations of Joseph H. Williams include University of Georgia & University of Colorado Boulder.
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Natural hybridization: how low can you go and still be important?
TL;DR: This paper examines two assumptions that have formed the basis for much of the past and present work on hybrid zones and demonstrates that various hybrid genotypes have equivalent or higher fitness than their parents in certain habitats.
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Pollination biology of basal angiosperms (ANITA Grade)
Leonard B. Thien,Peter Bernhardt,Margaret S. Devall,Zhi-Duan Chen,Yi-Bo Luo,Jian-Hua Fan,Liang-Chen Yuan,Joseph H. Williams +7 more
TL;DR: It is hypothesized that large flowers in Nymphaeaceae are the result of the interaction of heat, floral odors, and colored tepals to trap insects to increase fitness.
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Identification of diploid endosperm in an early angiosperm lineage
TL;DR: It is shown that diploid endosperms are common among early angiosperm lineages and may represent the ancestral condition among flowering plants.
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How discrete are oak species? insights from a hybrid zone between quercus grisea and quercus gambelii
Daniel J. Howard,Ralph W. Preszler,Joseph H. Williams,Joseph H. Williams,Sandra Fenchel,William J. Boecklen +5 more
TL;DR: A set of RAPD markers that distinguish between the white oaks Quercus gambelii and Q. grisea are described and used to examine patterns of gene exchange in an area of contact in the San Mateo Mountains of New Mexico, confirming that hybridization between the two species takes place.
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Novelties of the flowering plant pollen tube underlie diversification of a key life history stage
TL;DR: Comparative analyses point to accelerated pollen tube growth rate as a critical innovation that preceded the origin of the true closed carpel, long styles, multiseeded ovaries, and, in monocots and eudicots, much faster pollen tubes growth rates.