@article{fdi:010042599,
  title = {Évolution r{\'e}cente de la diversit{\'e} g{\'e}n{\'e}tique des riz cultiv{\'e}s ({O}ryza sativa et {O}. glaberrima) en {G}uin{\'e}e = {R}ecent evolution of rice genetic diversity in {G}uinea},
  author = {{B}arry, {M}. {B}. and {D}iagne, {A}. and {P}ham, {J}ean-{L}ouis and {A}hmadi, {N}.},
  editor = {},
  language = {{FRE}},
  abstract = {{T}he temporal dynamic of rice diversity was assessed in {G}uinea at the national level for the period 1996-2001 and at a natural regional level for the period 1979-2003. {A}t the national level, 1,697 farms located in 79 villages of the four natural regions of the country were surveyed. {T}he diversity descriptors used were the number of known and cultivated varieties and the {S}hannon diversity and evenness index. {T}he regional analysis was based on the comparison of samples collected in six villages of {L}ower {G}uinea in 1979 and 2003. {T}he varietal and allelic compositions at 10 microsatellite loci served as diversity descriptors. {T}he number of varieties per farmer and per village slightly increased during the 1996-2001 period. {V}arietal diversity was high, especially in {F}orest {G}uinea and {L}ower {G}uinea. {T}he rate of varietal use is however low and heterogeneous. {L}ess than 10% of the varieties are cultivated by more than 50% of the farmers of a village. {T}he recent dissemination of short-duration nerica varieties has not caused any reduction of pre-existing varieties as they are complementary to long-duration local varieties. {F}or the 1979-2003 period, the varietal composition in each village evolved substantially. {T}he average number of alleles per locus and per accession was significantly higher in 2003, and the allelic composition of homonymous accessions of the two collection dates was significantly different. {H}owever, alleles specific to each collection date had much lower frequencies compared to alleles common to the two collection dates. {T}hese results suggest that rice genetic diversity in {G}uinea has been maintained or even enhanced. {H}owever, at the village level, the diversity pattern remains fragile as the proportion of farmers who used all of the village varieties was low and heterogeneous. {A} continuous monitoring of the dynamics of rice varietal diversity in {G}uinea is needed.},
  keywords = {biodiversity ; genetic resources ; {G}uinea ; rice},
  booktitle = {},
  journal = {{C}ahiers {A}gricultures},
  volume = {17},
  numero = {2},
  pages = {122--127},
  ISSN = {1166-7699},
  year = {2008},
  DOI = {10.1684/agr.2008.0167},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042599},
}