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Articles by K. Akator
Total Records ( 3 ) for K. Akator
  A. Onasanya , Y. Sere , F. Nwilene , M.E. Abo and K. Akator
  High yielding rice genotypes with good levels of resistance to RYMV were identified at Africa Rice Center-WARDA in Cote d‘Ivoire. The yields and resistance stability of these genotypes, however, remain uncertain. The performance of 13 genotypes over 10 different RYMV isolates from 7 localities in Cote d’Ivoire was tested in the screenhouse. Chlorophyll (SPAD) and yield reductions due to RYMV disease were evaluated. Considerable diversity was observed in the reactions of these genotypes to all the RYMV isolates. Percentage yields and SPAD reduction were between 2.3-90.3 and 5.3-40%, respectively. Of 13 rice genotypes studied, IR 47686-15-1-1(P) had the lowest mean SPAD and yield reductions. The levels of resistance shown by japonicas were better than those of indicas. Six genotypes (FARO 11; GIGANTE (tete); H 232-44-1-1; IR 47686-15-1-1(P); IR 47686-15-1-1; ITA 235) could be described as possessing both stable and acceptable levels of resistance to RYMV. The high genotype by environment interactions in the reactions of the rice genotypes to RYMV suggests the possible existence of different strains of RYMV in Cote d’Ivoire. This information could be useful in rice breeding programs aiming at deployment of RYMV resistant genotypes to different rice ecologies and localities in Cote d’Ivoire.
  Y. Sere , A. Onasanya , V. Verdier , K. Akator , L.S. Ouedraogo , Z. Segda , M.M. Coulibaly , A.Y. Sido and A. Basso
  As little information is available in Africa on Xanthomonas oryzae pv. oryzae, a highly destructive pathogen of rice, and its relationship with released rice varieties, a disease survey and samplings were carried out in Niger, Burkina Faso and Mali which indicated a wide spread of Bacterial Leaf Blight (BLB) in farmers’ fields. Sixty pure BLB isolates cultures were obtained. Pathogenicity of 4 Malian isolates against four important rice varieties revealed differences in pathogenicity among isolates and in resistance of the varieties tested. The results obtained in these initial studies revealed the future research directions to increasing rice production in West Africa.
  A. Onasanya , Y. Sere , M. Sie , K. Akator , M.M. Coulibaly and A. Hamadoun
  Screenhouse studies were conducted using 10 RYMV isolates from 6 different localities in Mali against 8 WARDA differential rice genotypes to investigate the possible existence and classification of different pathotypes of RYMV in Mali. The reaction of 8 rice genotypes to the 10 RYMV isolates was different in terms of SPAD and yield reductions. The interaction between isolates and rice cultivar was also significant. AMMI cluster analysis revealed the existence of two pathotypes (HPI and MPI) of RYMV isolates in Mali. Of 8 rice genotypes studied, only Bouake 189 was highly susceptible to the two pathotypes. This information could be useful in the rice breeding programs aiming at deployment of RYMV resistant genotypes to different rice ecologies and localities in Mali.
 
 
 
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