Brent Hulke and Donald Wyse
Abstract: Interspecific hybrids in sunflower have been used historically as sources of disease resistance. Backcrossing for several generations is required to introgress genes from hexaploid species to annual sunflower (Helianthus annuus L.). A result of this repeated backcrossing is the rapid loss of genes from the donor parent. This article describes ongoing work to improve the efficiency and efficacy of introgressing genes from the hexaploid perennial, H. tuberosus L. for quantitative traits. Of particular interest are genes which control host-plant resistance to diseases and insect pests, and perennial habit.
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