期刊
NEW PHYTOLOGIST
卷 187, 期 1, 页码 230-239出版社
WILEY
DOI: 10.1111/j.1469-8137.2010.03234.x
关键词
adaptive trait introgression; drought escape; ecophysiology; hybridization; natural selection; phenology; plant architecture; range expansion
资金
- Brackenridge Field Laboratory of the University of Texas, Austin
- Lady Bird Johnson Wildflower Center
- USDA NRI [2003-35320]
- NSF DEB [0716868]
- NSF DDIG
- USDA [2001-00706]
P>Adaptive trait introgression is increasingly recognized as common. However, it is unclear whether adaptive genetic exchanges typically affect only a single trait, or instead affect multiple aspects of the phenotype. Here, we examine introgression of abiotic tolerance traits between two hybridizing North American sunflower species, Helianthus annuus and Helianthus debilis. In two common gardens in the hybrid range, we measured 10 ecophysiological, phenological, and architectural traits for parents and their natural and artificial hybrids, and examined how fitness covaried with trait values. Eight of the 10 traits showed patterns consistent with introgression from H. debilis into H. annuus, and suggested that H. debilis-like traits allowing rapid growth and reproduction before summer heat and drought have been favored in the hybrid range. Natural selection currently favors BC1 hybrids with H. debilis-like branching traits. We demonstrate that introgression has altered multiple aspects of the H. annuus phenotype in an adaptive manner, has affected traits relevant to both biotic and abiotic environments, and may have aided expansion of the H. annuus range into central Texas, USA.
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