Journal
ANNALS OF APPLIED BIOLOGY
Volume 171, Issue 2, Pages 202-213Publisher
WILEY
DOI: 10.1111/aab.12365
Keywords
Crop-wild hybrid; cross-combination; fitness performance; genotype x environment; rice; transgene persistence
Categories
Funding
- Key Project for Breeding Genetically Modified Organisms [2009ZX08011-012B]
- National Natural Science Foundation of China [31170505]
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The persistence of transgenes in wild populations may cause unintended ecological consequences, and the possibility of transgenes' persistence and introgression is dependent on fitness performance of transgenic crop-wild hybrids. To investigate the effects of transgene and genotypexenvironment on the fitness of crop-wild rice hybrids, a total of 11 cross-combination progenies between insect-resistant transgene (CpTI and Bt/CpTI) rice lines and wild rice (Oryza rufipogon) were evaluated at different sites with contrasting insect treatments. The results showed that fitness performance varied between transgenic hybrids having different wild parents and under different environmental conditions, indicating that fitness effects of transgenes on hybrid progenies depend heavily on the genetic background of recipient plants and growing environment. Significant fitness advantages conferred by transgenes were found only in some hybrids under high insect pressure condition, demonstrating that the level of target insects in the field environment influences the persistence and spread of insect-resistant transgenes in wild rice populations. These findings suggest that evolutionary fate of escaped transgenes is different in wild populations with diverse genetic backgrounds under various environmental conditions.
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