Brady Koehler

Two contrasting laboratory methods improve Silphium integrifolium Michx. germination rate to agronomically acceptable levels

Stephan Reinert, Kennedy L. Money, Greta B. G. Rockstad, Nolan C. Kane, David L. Van Tassel, Brent S. Hulke Abstract: Organic dormancy, the inability to germinate under favorable conditions, is a common problem in many crop species and their wild relatives, leading to more variable emergence, plant density, and growth rates, thus increasing costs, and […]

Two contrasting laboratory methods improve Silphium integrifolium Michx. germination rate to agronomically acceptable levels Read More »

Variation in floret size explains differences in wild bee visitation to cultivated sunflowers

Zoe M. Portlas, Jonathan R. Tetlie, Deirdre Prischmann-Voldseth, Brent S. Hulke, Jarrad R. Prasifka Abstract: Wild and managed bees are needed to move sunflower (Helianthus annuus L.) pollen, both to create hybrid seed and to encourage high, consistent yields when those hybrids are subsequently grown. Among floral traits that influence bee preference, floret size may be

Variation in floret size explains differences in wild bee visitation to cultivated sunflowers Read More »

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.)

Qing-Ming Gao, Nolan C. Kane, Brent S. Hulke, Stephan Reinert, Cloe S. Pogoda, Silas Tittes, Jarrad R. Prasifka Abstract: Capitate glandular trichomes (CGT), one type of glandular trichomes, are most common in Asteraceae species. CGT can produce various secondary metabolites such as sesquiterpene lactones (STLs) and provide durable resistance to insect pests. In sunflower, CGT-based

Genetic Architecture of Capitate Glandular Trichome Density in Florets of Domesticated Sunflower (Helianthus annuus L.) Read More »

Somatic Embryogenesis from Corolla Tubes of Interspecific Amphiploids between Cultivated Sunflower (Helianthus annuus L.) and Its Wild Species

Xuelin Fu, Lili Qi, Brent Hulke, Gerald Seiler, Chao-Chien Jan Abstract: Somatic embryogenesis in vitro provides an efficient means of plant multiplication, facilitating sunflower improvement and germplasm innovation. In the present study, using interspecific amphiploids (2n=4x=68) between cultivated sunflower and wild perennial Helianthus species as explant donors, somatic embryos were induced directly from the surface of corolla

Somatic Embryogenesis from Corolla Tubes of Interspecific Amphiploids between Cultivated Sunflower (Helianthus annuus L.) and Its Wild Species Read More »

Registration of Sunflower Oilseed Maintainer Genetic Stocks HOLS1, HOLS2, HOLS3, and HOLS4

Brent S. Hulke, Qing-Ming Gao, Michael E. Foley Abstract: One of the primary goals for the oilseed sunflower (Helianthus annuus L.) industry is to provide novel oil products for human consumption. One oil profile of particular interest is high oleic and low saturated fat, because it combines high oxidative stability of the oil with a reduction

Registration of Sunflower Oilseed Maintainer Genetic Stocks HOLS1, HOLS2, HOLS3, and HOLS4 Read More »