Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
Vol. 22, No. 1, 2016, pp. 52-61
Bioline Code: ej16036
Full paper language: English
Document type: Research Article
Document available free of charge
Electronic Journal of Biotechnology, Vol. 22, No. 1, 2016, pp. 52-61
© Copyright 2016 - Pontificia Universidad Católica de Valparaíso
Evaluation of fitness in F2 generations of Africa Biofortified Sorghum event 188 and weedy Sorghum bicolor ssp. drummondii |
Magomere, Titus; Obukosia, Silas; Albertsen, Mark; Wambugu, Florence; Kamanga, Daniel; Njuguna, Michael; Gaffney, Jim; Zhao, Zuo-Yu; Che, Ping; Aseta, Antony; Kimani, Esther & Mwasame, Evans
Background: Introgression of transgenes from crops to their wild species may enhance the adaptive advantage
and therefore the invasiveness of and weedy forms. The study evaluated the effect of Africa Biofortified
Sorghum (ABS) genes from ABS event 188 on the vegetative and reproductive features of the F2 populations
derived from crosses with Sorghum bicolor subsp. drummondii.
Results: F1 populations were obtained from reciprocal crosses involving ABS event 188 and its null segregant with
inbred weedy parents from S. bicolor subsp. drummondii. Four F2 populations and four parental populations were
raised in RCBD with 4 replications in a confined field plot for two seasons. Vegetative and reproductive traits were
evaluated. The vigour shown in the F2 populations from the reciprocal crosses involving ABS event 188 and
S. bicolor subsp. drummondii was similar to that in the crosses involving the null segregant and S. bicolor subsp.
drummondii. Differences in vegetative and reproductive parameters were observed between the parental
controls and the F2 populations. Examination of the above and below ground vegetative biomass showed lack
of novel weedy related features like rhizomes.
Conclusions: Therefore, release of crops with ABS 188 transgenes into cropping systems is not likely to pose a risk
of conferring additional adaptive advantage in the introgressing populations. The interaction of ABS genes in
weedy backgrounds will also not have an effect towards enhancing the weedy features in these populations.
Beta-carotene; Heterosis; Transgenics; Phospho-mannose isomarese
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