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Research Detail

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K. Nahar
Department of Botany, University of Rajshahi, Rajshahi-6205, Banglades

A. C. Deb
Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi-6205, Bangladesh

M. A. Samad
Department of Botany, University of Rajshahi, Rajshahi-6205, Banglades

M. A. Khaleque
Department of Botany, University of Rajshahi, Rajshahi-6205, Banglades

The present investigation deals with the genetic study of six agronomic characters namely shoot weight (SHW), root weight (RW), number of pods per plant (NPdPP), pod weight per plant (PdWPP), number of seeds per plant (NSPP) and seed weight per plant (SWPP) in two crosses viz. cross I (line-21×line-17) and cross II (line-21×line-20) between three lines of black gram. In Mather’s scaling test, A, B and C were non-significant in most of the cases. The potence values were observed non-significant for all the characters, except for NPdPP in cross II where it was significant. In the Joint scaling test, the non-significant χ2 values was found in cross I for SHW, PdWPP and SWPP. In RW non-significant χ2 was found in both of the crosses. Non-significant χ2 values indicated that the presence of only additive-dominance relationship in these characters. For estimates of the components of variation, D and H for all the characters in both of the crosses expressed negative values, except for NPdPP and NSPP where D were positive. In almost all the cases over dominance was found in negative direction. In these materials due to the low and negative genetic components of variation, heritability and genetic advance were found to be low and negative. However, high and moderate heritability with 77% and 35% for NPdPP and NSPP, respectively were found in cross II. Selection practices may be fruitful with these characters and crosses as they also showed positive and moderate genetic advance.

  Agronomical traits, Sngle cross, Blackgram
  The research field, behind the 3rd Science Building, University of Rajshahi
  00-08-2005
  00-01-2006
  Variety and Species
  Black gram

To estimate the heritability in relation to genetic interpretation are important in determining the response to selection for the traits under observation.

Materials used in this study comprised three lines of black gram  (Vigna mungo (L.) Hepper)  namely E 86325, E 2025, E 86309 with accessions number 17,20 and 21 respectively, used as parents. Two single crosses [cross I (line-21× line-17) and cross II (line-21× line-20)] were made with reciprocals between the selected parents. The experiment was done in research field, behind the 3rd Science Building, University of Rajshahi containing a randomized complete block design with three blocks following individual plant randomization in August, 2005. Data were collected on individual plant basis for six yield and yield components viz. shoot weight (SHW), root weight (RW), number of pods per plant (NPdPP), pod weight per plant (PdWPP), number of seeds per plant (NSPP) and seed weight per plant (SWPP). The collected data were analyzed using biometrical techniques. The techniques that have been used are described in the following sub-heads: The analysis of variance (ANOVA) is done for testing the significant differences among the population. Variance analysis for the six generations ie. P1, P2, F1, F2, B1 and B2 was carried out separately for the six characters of two crosses in blackgram. Since P1 and P2 are different parents, in this way P1, P2, F1, F2, B1 and B2 constitute six generations. The variance due to different sources such as replicates, within, reciprocals and types were analyzed in the present study. ather’s scaling test was done. Test of potence could be done by comparing F1 and F2 means as calculated by the formula. Joint scaling test was done based on 3-parameter model for six generations. For testing the adequacy of additive-dominance model following weighted least square technique was done. Heritability was calculated in two different ways by the formulae. Genetic advance was calculated by the formula.

  Int. J. Sustain. Crop Prod. 5(3):22-28, 2010
  
Funding Source:
1.  Government Budget:  
  

The cross I with characters PDWPP and SWPP may be considered for further breeding research with care for timely sowing. It may also be concluded that selection practices may be done with the characters, NPDPP and NSPP in cross II as they showed high to moderate positive narrow sense heritability and genetic advance.

  Journal
  


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