Germplasm Management of Faba Bean (Vicia faba L.): Monitoring Intercrossing between Accessions with Inter-plot Barriers |
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Authors: | M J Suso S Gilsanz G Duc P Marget M T Moreno |
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Institution: | (1) IAS-CSIC, Apdo 4084, 14080 Córdoba, Spain;(2) CIFA, Apdo 3092, 14080 Córdoba, Spain;(3) INRA- URLEG, BP 86510, 21065 Dijon Cédex, France |
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Abstract: | Knowledge of gene flow is essential for designing strategies of germplasm multiplication. Inter and intra-plot gene flow and
pollen dispersion between small plots in a field of Vicia faba germplasm multiplication were measured under four isolation zones at two locations. The four isolation zones were: a barren
zone, a nucleocytoplasmic Vicia faba male sterile line, a Vicia faba tetraploid genotype and a Vicia narbonensis L. population. Genotypes fixed for alternative isozyme and allozyme alleles allowed the identification of inter and intra-plot
hybrids through progeny testing. A set of log-likelihood ratio (LLR) G tests were used to analyze the effects of geographical location, isolation zone and genotype on the different components
of gene flow. Considerable heterogeneity among the genotypes in all the components, inter and intra-plot gene flow and pollen
dispersion, of gene flow has been found. It has been shown that gene flow is location, isolation zone and genotype dependent.
Planting a barrier surrounding the plots rather than using a non cultivated area between plots seemed more or less efficient
for preventing inter-plot gene flow depending on the genotype and the location. Specific associations between genotype and
male sterile or tetraploid border rows for every location can bring about gene flow as high, or even higher, than those produced
by a barren zone. Differences among the genotypes and borders in flowering overlapping appear not to be the major factor influencing
the pattern of gene flow. Implications of the pattern of gene flow observed are discussed in relation to crop diversity managed
by farmers. |
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Keywords: | Diversity conservation ex situ conservation Faba beans Gene flow Inter-plot barriers Pollen dispersion Vicia faba Vicia narbonensis |
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