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Articles by M.K. Bashar
Total Records ( 4 ) for M.K. Bashar
  Khaleda Akter , M.K. Bashar , K.M. Iftekharuddaula , M.S. Ahmed and E.S.M.H. Rashid
  Forty five rice genotypes originating from Bangladesh, IRRI (Philippines), Japan and China were evaluated under irrigated ecosystem with a view to finding out genetic divergence for 10 characters including yield. The genotypes were constellated into five distinct groups with the range of three genotypes in cluster V and 16 genotypes in cluster III. The inter-cluster distances were larger than the intra-cluster distances in all cases except in cluster III, suggesting wider genetic diversity among the genotypes of different groups. The intra- cluster distance was highest in cluster III and least in cluster V. Maximum inter- cluster distance was observed between genotypes of cluster I and II followed by cluster I and III; II and IV; III and IV and the minimum was found between genotypes of cluster II and III. Plant height, grains/panicle and yield/hill were mainly responsible for genetic divergence while considering mean values. Though grains/panicle, days to flowering and grain length were positive contributors to genetic diversity based on the latent vectors. Clusters with small intra-cluster distances were considered less diverse than those with large distances. The mean yield, grains/panicle, plant height and days to flowering was lowest in cluster I and therefore, crosses involving the genotypes from this cluster with those from cluster II and III may exhibit high heterosis for earliness and grains/panicle. Crosses could also be made between clusters IV with that of II and III for evolving high yielding and early maturing varieties. Closer affinity of Bangladeshi traditional varieties was observed though some of them were in different clusters. Most of the breeding lines were included in cluster III indicating homogeneity in their pedigree.
  M.K. Bashar , Khaleda Akter , K.M. Iftekharuddaula and M.S. Ali
  Leaf water potential (y leaf) was measured in culture solution in hydroponic system under controlled condition of the two crosses involving diverse rice genotypes to investigate the inheritance pattern and heritability. Polygenes were involved in this trait and theψleaf was governed either by no-dominant or partial dominant alleles and that was controlled by genes with additive effects in upland and hill rice. The heritability estimates were low (25-28%). Leaf water potential was significantly and positively correlated with root thickness, root volume, root length, plant height and leaf area in one of the two crosses. Negative relationship was found with shoot dry weight.
  M.S. Ali , S.Khatun , M.K. Bashar , M.S. Alam , D. Purba , M. Kawase , K. Okuno and S. Kiyosawa
  In two tests, 108 and 96 F3 lines derived from a cross of rice varieties, Nipponbare (japonica) and Juma (indica) were used for gene analysis of lesion size and lesion number as components of field resistance to blast, respectively. Blast isolate, Ken 54-20 was used in evaluating disease resistance of the hybrid population. Nipponbare showed a small number of large lesions and Juma showed a large number of small lesions in one of the two tests. F3 plants with higher levels of resistance (evaluated as; highly resistant) than their parents were observed in some lines. Resistances were evaluated on individual plant basis and divided into four reaction types, R, N (Nipponbare type, small lesion number), J (Juma type, small lesion size) and S (susceptible). Resistances in three classes, R, R+N and R+N+J, were analyzed by the cumulative frequency distribution curve method. To explain these three types of segregations, three genes (controlling inhibition of lesion size and number) with minor effect were assumed: AACC in Nipponbare and BB in Juma. Additive effect of these three genes, AABBCC, was considered for explaining R type resistance, AACC for N type field resistance and BB for J type field resistance. But in another test (Test 2) with different F3 segregating lines derived from the same F1, resistance was explained by BBDD genes in Juma and EE gene in Nipponbare. This suggests that at least one gene in Nipponbare was not expressed in Test 2, indicating of epistatic change of gene action between the tests. There was no association between seed sterility and blast resistance, although there was an association between color of the basal leaf sheath and seed sterility. This means that genes responsible for seed sterility are not linked with blast resistance genes.
  S.H. Habib , M.K. Bashar , M. Khalequzzaman , M.S. Ahmed and E.S.M.H. Rashid
  Ten local biroin rice varieties were evaluated with a view to find out variability and genetic association for grain yield and its component characters. All the characters tested were showed significant variation among the varieties. The highest genetic variability was obtained in flag leaf area and filled grains/panicle. High heritability associated with high genetic advance was observed in filled grains/panicle, 1000-grain weight flag leaf area, harvest index and grain yield. Genotypic correlation coefficients were higher than the corresponding phenotypic correlation coefficients in most of the cases. Plant height, days to maturity and filled grains/panicle showed significant positive correlation with grain yield. Path analysis revealed that plant height, days to maturity, 1000-grain weight and chlorophyll content had positive and highest direct effect on grain yields. Moreover, panicle length had highest indirect effect on grain yield through plant height and filled grains/panicle had positive and higher indirect effect on grain yield through days to maturity, panicles per hill and panicle length.
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