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), 513-521. (doi:10.1016/j.baae.2010.06.007 ).

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Description/Abstract

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

Item Type: Article
ISSNs: 1439-1791 (print)
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history > QH301 Biology
Q Science > QK Botany
Divisions: University Structure - Pre August 2011 > School of Biological Sciences
ePrint ID: 181703
Date Deposited: 26 Apr 2011 15:20
Last Modified: 27 Mar 2014 19:35
URI: http://eprints.soton.ac.uk/id/eprint/181703

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