ASSESSMENT OF COMBINING ABILITY AND HETEROSIS FOR YIELD AND QUALITY TRAITS UTILIZING PETALOID CMS INBREDS IN TROPICAL CARROT (Daucus carota L.)
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Date
2021
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Journal ISSN
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Publisher
DIVISION OF VEGETABLE SCIENCE INDIAN AGRICULTURAL RESEARCH INSTITUTE NEW DELHI
Abstract
The present study “Assessment of combining ability and heterosis for yield and
quality traits utilizing petaloid CMS inbreds in tropical carrot (Daucus carota L.)” was
undertaken with the objectives to study combining ability and heterosis for twelve
quantitative, nine biochemical and quality traits and seven mineral nutrients. The study
material includes 16 genotypes (4 CMS lines and 12 Testers), 48 hybrids and one check,
Pusa Vasuda. The analysis of variance revealved highly significant difference for all the
quantitative, biochemical and quality characters and mineral nutrients. The hybrids
DCatH 9848, followed by DCatH 531, DCatH 713, DCatH 9113, DCatH 5313, DCatH
785, DCatH 981, DCatH 71 and DCatH 716 are most promising in terms of root yield and
have self-core. Highest GCA for root weight and root yield for lines and testers was
observed in DCatCMS-7 and DCat-1, respectively. For root yield, the hybrid DCatH
9848 recorded heterosis percentage of 38.92%, 38.10% and 43.21% over mid parent,
better parent and Pusa Vasuda (check), respectively. The line and tester with highly
significant GCA for root yield were DCatCMS-7 and DCat-1, respectively. The genetic
components of variance due to SCA were greater than GCA for most of the traits except
for days to root maturity and root length. The highest yielding hybrids for invert sugar,
juice recovery, total sugars and total antioxidant activity were DCatH 788, DCatH 5300,
DCatH 9813 and DCatH 736, respectively. DCatH 9837 was best hybrid for total
carotenoids, lycopene and β-carotene and DCatH 5316 for TSS and fructose. Dominant
gene action was observed in most of the traits like TSS, invert sugar, fructose, total
sugars, total carotenoids, lycopene and β-carotene while additive gene action was found
only in juice recovery and total antioxidant activity. The highest yielding hybrids for
potassium, calcium and magnesium were DCatH 711, DCatH 536 and DCatH 785,
respectively. Similarly, the highest yielding hybrids for iron, zinc, copper and manganese
was DCatH 71, DCatH 9888, DCatH 76 and DCatH 5316, respectively. Dominant gene
action was observed in most of the mineral nutrients except potassium and manganese.
Thus, it is evident that heterosis breeding can be effectively utilized in the improvement
of above traits in carrot. The best performing lines and hybrids can be further used in
carrot breeding programme.
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Description
T-10510