Evaluation of Selection Effectiveness for Productivity in Mutant Populations of Common Bread Wheat

G. RACHOVSKA1 and D. DIMOVA2
1 Institute for Plant Genetic Resources “K. Malkov”, BG-4122 Sadovo, Bulgaria
2 Agrarian University, BG-4000 Plovdiv, Bulgaria

Abstract

RACHOVSKA, G. and D. DIMOVA, 2002. Evaluation of selection effectiveness for productivity in mutant populations of common bread wheat. Bulg. J. Agric. Sci., 8: 473–478

The research is carried out in the Institute for Plant Genetic Resources in Sadovo during the years 1997–2000.
The effectiveness of selection for productivity in mutant populations of bread wheat when they are received after sodium azide treatment of seeds with accelerated metabolism is evaluated. For this purpose seeds from cultivars Momtchil, Pobeda and Katya, first are presoaked in water for 6, 12, 18 and 24 hours and further are treated with sodium azide (SA) in both concentrations: 1mM and 10mM for two hours.
In M2 generation is measured the grain weight of 100 plants per each variant on the principle of random extraction. This qualification is aimed to describe the mean value, the precision of measurement and the variation coefficient for examined character. In M2 and M3 generations is estimated the selection effectiveness according to the equation of Alexander et al. (1984). The realised heritability in M3 from M2 also is calculated.
The results show that selection for productivity in wheat mutant populations received after treatment with sodium azide of seeds with accelerated metabolism should be initiate in the third mutant generation at least.
The selection effectiveness in M3 for wheat cultivars Pobeda and Katya reaches the highest value at 12 hours seed presoak and post-treatment with 1mM sodium azide. For cv. Momtchil, which is more slow sensitive to the chemical mutagen, the maximum selection effectiveness is observed after 18 hours seed presoak and treatment with 10mM sodium azide. The realised heritability from M2 in M3 confirmed the statement that the picking by productivity in the examined mutant populations is most effective when applied 12–18 hours seed presoak in water.

Key words: mutant populations, common bread wheat, selection effectiveness