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Articles by A.R. Bizhannia
Total Records ( 2 ) for A.R. Bizhannia
  A.R. Seidavi , A.R. Bizhannia , M. Ghanipoor and A.A.A. Qotbi
  Aim of this research was investigation on improvement possibility of resistance, production and reproduction traits in 3P, 2P and P generations in three Japanese pure lines of silkworm Bombyx mori L., using individual selection in 3P generation parent`s level. At silk cocoon production process and silkworm breeding programs, reproduction traits supplies silkworm egg producers, cocoon quantitative and resistance traits supplies farmers` benefits. Hence it must be noticed to these traits together. Furthermore, selection systems applied in 3P pure line levels. Reproduction, production and resistance characters have negative correlations probably in some varieties. Therefore, an experiment must be designed to investigation on effect of parent`s selection on the basis of cocoon weight on reproduction and resistance characters in 3P, 2P and P generations. At each pure line including 31, 103 and 107, it is recorded male and female cocoon weight and then 16 sire and dam parents were selected accordingly the most weight at each line. Furthermore, 16 sire and dam parents were selected by chance and without any selection at each line. These three pure lines were reared in 3P, 2P and P generations and investigated and compared their resistance, production and reproduction traits separately. From obtained results, it was showed that phenotypic trend for cocoon weight is positive and significant (p<0.01). It is showed that parental selection on the basis of single cocoon weight in 3P generation, had not decrease reproduction and resistance characters at next generations of 3P, 2P and P significantly (p<0.01). Hatchability, defected eggs percentage and pupae vitality were not declined significantly in three studied pure lines (p<0.01). These results could due non-negative correlations between these traits in three studied pure lines. From obtained results, parents would be selected on the basis of cocoon weight parameters in 3P generation. Also it is recommended that economical coefficients and genetical parameters are noticed for reproductive, resistance and quantitative cocoon characters together.
  A.R. Bizhannia , S.Z. Mirhosseini , B. Rabiee and M. Taeb
  The silkworm is an important economical insect in sericultural field. Its major production-economic characteristics are polygenic. In this study, three F2 populations (second generation) derived from three cross between three pairs, parents of Lemon Khorasan (as maternal) and 107 (as paternal) lines. we contacted AFLP (amplified fragment length polymorphism) technique for mapping genetic factors or QTLs that effect on Cocoon Shell Weight (CSW) trait. Following it we used 20 selected primer combinations of PstI/TaqI and DNAs were individually extracted to phenol-chloroform method. They digested by two restriction enzymes (TaqI and PstI) and also produced DNA fragments amplified by appropriate adaptors separately. After transferring of DNAs samples on annealed 6% polyacrylamide gels and genotyping of individuals, the linkage maps of each population were drawed. The QTLs for cocoon shell weight trait in LRS = LRT>12.5 (LOD>2.71) threshold level based on permutation test (n = 1000) and using compound interval mapping methods were analyzed and detected 5, 1 and 1 QTLs that were localized on linkage groups 9, 11; 12 and 24 in each studied F2 populations, respectively. The QTLs had different gene effects from over dominance, dominance to partial dominance.
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