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Estimation of genetic diversity among newly developed winter maize inbred lines

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Title Estimation of genetic diversity among newly developed winter maize inbred lines
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Creator Singh S.B., Chikkappa G. Karjagi, Kumar S., Kumar K., Yathish, KR3., Jat B.S., Kasana, R.K., Kumar, A. and Rakshit S.
 
Subject D square, Genetic diversity, inbreds, rabi maize,
 
Description Maize (Zea mays L.), the queen of cereals, holds unmatched fitness across diverse
environments due to the high level of plasticity in its genome. Maize is gaining
exponential rise in global demand even over the wheat and rice reflecting the
substantial growth of maize in developing as well as industrial countries. Exploitation
of hybrid vigor in maize has gained much significance in view of tremendous increase
in its yield but still it demands the continuous development of better than the best
hybrids to fulfill these rising demands in terms of yield as well as quality. Looking
into the above facts, genetic diversity study at the morphological as well as molecular
level with the help of forty polymorphic markers was made using 140 newly
developed and 13 parental inbreds of released maize hybrids at Regional maize
Research & Seed Production Center (ICAR􀀐IIMR), Begusarai, Bihar during Rabi,
2018􀀐19. This study was conducted to understand the diverse nature among these
lines and subsequently to use the desirable diverse parents in maize breeding program
to produce superior hybrids, segregating populations with high variability and
introgression of desirable traits/genes. D square study revealed the twenty clusters
among which three clusters comprised 92, 21 and 23 genotypes while 17 genotypes
falls in 17 different clusters individually. The highest inter􀀐cluster distance was found
between the cluster 17 & 19 (IMLSB􀀐955􀀐1 & IMLSB􀀐2094) followed by cluster 13
& 17 (IMLSB􀀐423􀀐1 & IMLSB􀀐955􀀐1) and 14 & 17 (IMLSB􀀐81􀀐1 & IMLSB􀀐955􀀐1).
Among the first three clusters highest inter􀀐cluster distance was found between cluster
2 & cluster 3 and highest intra􀀐cluster distance was observed within cluster 2. This
reveals that the crosses among these distant genotypes may harness greater level of
heterosis. Molecular diversity study with the help of 40 polymorphic markers which
displayed clear size differences and total of 873 alleles were generated through these
primers with an average polymorphism information content value of 0.8367. The
primer bnlg 1614 and bnlg1642 was found as the best marker for identification of genotypes as revealed by PIC values (0.9838 & 0.9737 respectively). The Jaccard’s
dissimilarity index showed the highest value of 1.00 among the genotypes IMLSB􀀐
274􀀐1 & LM􀀐16 followed by IMLSB􀀐123􀀐1 & LM􀀐16 (0.981), IMLSB􀀐119􀀐2 & LM􀀐
14 (0.978), IMLSB􀀐114􀀐1 & HKI􀀐1128 (0.978) and IMLSB􀀐106􀀐2 & HKI􀀐1128
(0.978). The Jaccard’s dissimilarity index classified the total genotypes in two major
clusters and eight sub clusters. The high D square distance found among the
genotypes IMLSB􀀐955􀀐1 & IMLSB􀀐2094, IMLSB􀀐423􀀐1 & IMLSB􀀐955􀀐1 and
IMLSB􀀐81􀀐1 & IMLSB􀀐955􀀐1 also recorded high Jaccard’s dissimilarity coefficient
value of 0.906, 0.798 & 0.840 respectively. These diverse genotypes can be used in
further breeding program in the development of high yielding single cross maize
hybrids as well as segregating population with high variability and introgression of
desirable traits/genes.
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Date 2020-12-25T16:49:06Z
2020-12-25T16:49:06Z
1001-01-01
 
Type Presentation
 
Identifier Singh S.B., Chikkappa G. Karjagi, Kumar S., Kumar K., Yathish, KR3., Jat B.S., Kasana, R.K., Kumar, A. and Rakshit S.(2020). Estimation of genetic diversity among newly developed winter maize inbred lines in Souvenir National Seminar on ‘’Maize for Crop Diversification under Changing Climatic Scenario pp 126-127.
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http://krishi.icar.gov.in/jspui/handle/123456789/43624
 
Language English
 
Relation Not Available;
 
Publisher ICAR-Indian Institute of Maize Research. Ludhiana