COMBINING INDUCED AND RECOMBINATIONAL VARIABILITY FOR IMPROVING PRODUCTIVITY IN BLACKGRAM (Vigna mungo (L.) Hepper)
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Date
2001-08-07
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
An investigation was carried out to compare ttie variabiiity generated
through hybridization and combination of hybridization and mutation to improve
yield and its component traits. Two locally adopted cuitivars such as TAU-1 and
Manikya were crossed with two donor iines viz., 169 for number of pods per piant
and 216 for 100 seed weight. The seeds of the four singie cross hybrids were
treated with 2Qkr gamma rays and the segregating populations of four irradiated
and four unirradiated single crosses, two three way crosses and one double cross
were studied for seven quantitative traits. The irradiated progenies of single cross
hybrids exhibited higher mean performance for plant height, number of pods per
plant number of seeds per pod and seed yield. The other characters such as
number of clusters per plant and pod length exhibited high mean values in
hybridized populations indicating the shift of mean towards desirable side due to
hybridization. There was no change in mean performance for 100 seed weight in
any of populations studied.The estimates of PCV and GCV in different segregating populations indicated that varibility generated by hybridization for character like number of clusters per plants and pod length. For other characters such as plant height, number of pods per plant, number of seeds per pod. 100 seed weight and seed yield per plants, hybridized populations involving more than two parents produced more variability. Most of the characters understudy exhibited low to moderated high heritability along with lower estimates of genetic advance indicating role of environment. While 100 seed weight and number of clusters per recorded high heritability and genetic advance indicated the least influence of environment on these traits. The nature and degree of association among different traits under study were changed in favourable direction in irradiated hybridized populations compared to hybridized populations. The seed yield exhibited significant and positive association with plant height, number of clusters and number of pods per plant in all the segregating populations however in irradiated population in addition populations of crosses invlving more than two parents produced large number of supenor progenies in respect of seed yield and its contributing trails compared to other populations.
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