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Abiotic stress and transgenics: implications for reproductive success and crop-to-wild gene flow in Brassicas

Himanen, Sari J., Nerg, Anne-Marja, Poppy, Guy M., Stewart Jr., C. Neal and Holopainen, Jarmo K. (2010) Abiotic stress and transgenics: implications for reproductive success and crop-to-wild gene flow in Brassicas Basic and Applied Ecology, 11, (6), pp. 513-521. (doi:10.1016/j.baae.2010.06.007).

Record type: Article


Various abiotic and biotic stressors affect crop and weed plant performance in agroecosystems Ozone (O-3) tolerance in plants is partly regulated by the genotype and phenotypical properties, and it vanes greatly in related species of wild and crop backgrounds Thus, a continuous increase in atmospheric O-3 concentration could change population dynamics of sexually compatible crop and weed species, and consequently affect crop-to-wild gene flow in the future One way to build resistance against a biotic stressor, in this case insect-mediated herbivory, in crop plants is transgene-mediated insecticidal toxin production In this study we aimed to describe how the physiological and phenological responses in a crop Brassica and its weedy relatives functioned to affect their comparative O-3 tolerance Furthermore, we studied how harbouring a transgene affects these responses in B napus and B rapa x transgenic B napus BC2F2 backcross hybrid plants to reveal any within-plant trade-offs among toxin production, growth and O-3 tolerance We found a higher number of O-3 symptoms but more effective compensatory assimilate allocation directed to reproduction for wild B rapa compared to crop B napus under elevated O-3 This result suggested that the invasion-orientated strategy of producing a high number of seeds when vegetative growth is limited might improve the performance of weedy species under elevated O-3 The probabilities for crop-to-wild transgene flow could be increased through higher seed production in hybrids under elevated O-3, but the germination of hybrid seeds in particular was hampered by O-3 The presence of transgenes did not perturb fecundity, within-plant biomass allocation or O-3 tolerance of B napus

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Published date: 2010


Local EPrints ID: 181703
ISSN: 1439-1791
PURE UUID: 57d73c48-7002-443b-87ef-36871e9ebf20

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Date deposited: 26 Apr 2011 15:20
Last modified: 18 Jul 2017 11:58

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Author: Sari J. Himanen
Author: Anne-Marja Nerg
Author: Guy M. Poppy
Author: C. Neal Stewart Jr.
Author: Jarmo K. Holopainen

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