International Journal of Chemical Studies
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P-ISSN: 2349-8528, E-ISSN: 2321-4902   |   

Vol. 7, Issue 3 (2019)

Formulation of selection index by assigning inverse of means as economic weights in long duration genotypes of rice (Oryza sativa L.)


Author(s): Ch. Santhi Priya and D Ratna Babu

Abstract: The present experimental was carried out using the forty long duration rice genotypes with the objective of formulating suitable selection index using inverse of means as their respective economic weights. Data recorded on various traits viz., days to 50% flowering, days to maturity, productive tillers per plant, plant height, panicle length, grains per panicle, 1000-seed weight, kernel length, kernel breadth, L/B ratio and grain yield per plant were used for formulating suitable selection index. It was found that selection based on index value is efficient than direct selection on yield alone and addition of characters one by one in the construction of selection index resulted in the increased estimates of genetic advance. Finally the index constructed using all the eleven characters, recorded maximum expected genetic advance and percent gain over grain yield per plant. From this it become evident that the best possible construct in case of rice for selecting superior genotypes should include all the characters that are considered for this investigation. Further when equal economic weights are used in construction of selection indices for the same traits and in the same genotypes, it was observed that these results were similar. This indicates the equal efficiency of both ways of assigning economic weights (i.e. using equal economic weights and using inverse of means as economic weights) in developing selection index.

Pages: 4606-4609  |  263 Views  61 Downloads

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How to cite this article:
Ch. Santhi Priya, D Ratna Babu. Formulation of selection index by assigning inverse of means as economic weights in long duration genotypes of rice (Oryza sativa L.). Int J Chem Stud 2019;7(3):4606-4609.
 

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