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Research Article
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Variability for Seedling Vigour in Two Maize (Zea mays L.) Populations
I: Means, Variance Components and Heritabilities |
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Muhammad Jawad Asghar
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Iftikhar Ahmad Khan
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ABSTRACT
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The objective of this study was to evaluate genetic variability and
heritability for various seedling traits among S1 families of both
maize populations. Three hundred S1 families of two maize populations,
viz., UAF Population-1 and UAF Population-2 were evaluated for various seedling
vigour traits in two replicates. Highly significant mean squares for almost
all the seedling traits indicated the presence of sufficient amount of variability
for these traits. Genotypic coefficients of variation were comparatively higher
for shoot dry weight, shoot fresh weight and root dry weight in both populations.
The estimates of genetic variance were found significant for almost all the
seedling traits except for emergence rate index which indicated the presence
of exploitable genetic variability. The estimates of broad sense heritability
were significant for all the seedling traits except for emergence rate index
in UAF Population-1. The most heritable traits were shoot fresh length (h2
= 0.63 and 0.68) and shoot fresh weight (h2 = 0.59 and 0.63) in both
populations which suggested that improvement in seedling vigour is possible
by using S1 family selection.
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REFERENCES |
1: Asghar, M.J. and S.S. Mehdi, 1999. Variability for grain yield, its components and quality traits in a sweet corn population. Pak. J. Biol. Sci., 2: 1366-1370.
CrossRef | Direct Link |
2: Chopra, V.L., 2001. Breeding Field Crops: Theory and Practice. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, India.
3: Malvar, R.A., A. Ordas, P. Revilla and M.E. Cartea, 1996. Estimates of genetic variances in two Spanish populations of maize. Crop Sci., 36: 291-295.
Direct Link |
4: Mehdi, S.S. and M. Ahsan, 1999. Evaluation of S1 maize (Zea mays L.) families for green fodder yield. Pak. J. Biol. Sci., 2: 1069-1070.
CrossRef | Direct Link |
5: Mehdi, S.S. and M. Ahsan, 2001. Comparative evaluation of newly developed maize population for fodder purposes. J. Biol. Sci., 1: 7-8.
CrossRef | Direct Link |
6: Sekhon, R.S., B.S. Dhillon, V.K. Saxena and M.S. Grewal, 1999. Modified S1 recurrent selection in a maize composite. Maydica, 44: 175-177.
7: Vasal, S.K., B.S. Dhillon, S.D. Mclean, J. Crossa and S.H. Zhang, 1995. Effect of S3 recurrent selection in 4 tropical maize populations on their selfed and random mated generations. Crop Sci., 35: 697-702.
Direct Link |
8: Vasal, S.K., B.S. Dhillon and S. Pandey, 1997. Recurrent selection methods based on evaluation-cum-recombination block. Plant Breed. Rev., 14: 39-63.
Direct Link |
9: Adeyemo, M.O. and M.A.B. Fakorede, 1995. Genetic variation for seedling vigour and its correlated response for grain yield in a tropical maize (Zea mays L.) population. Discovery Innovat., 7: 111-118.
10: Mehdi, S.S. and M. Ahsan, 1999. Evaluation of S1 maize (Zea mays L.) families at seedling stage for fodder purposes. Pak. J. Biol. Sci., 2: 404-405.
Direct Link |
11: Mehdi, S.S. and M. Ahsan, 2000. Coefficient of variation, inter-relationships and heritability estimates for some seedling traits in maize in C1. Recurrent selection cycle. Pak. J. Biol. Sci., 3: 181-182.
Direct Link |
12: Mehdi, S.S. and M. Ahsan, 2000. Genetic coefficient of variation, relative expected genetic advance and inter-relationships in maize (Zea mays L.) for green fodder purposes at seedling stage. Pak. J. Biol. Sci., 3: 1890-1891.
CrossRef | Direct Link |
13: Mehdi, S.S., N. Ahmad and M. Ahsan, 2001. Evaluation of S1 maize (Zea mays L.) families at seedling stage under drought conditions. J. Biol. Sci., 1: 4-6.
CrossRef | Direct Link |
14: Kathy, K.L.E. and E.C. Brummer, 2000. Response of six alfalfa populations to selection under laboratory conditions for germination and seedling vigour at low temperatures. Crop Sci., 40: 959-964.
Direct Link |
15: International Seed Testing Association, 1997. Hand Book for Seedling Evaluation. International Seed Testing Association, Zurich, Switzerland.
16: Habib, S., 2004. Genetic variation of seedling traits in a random mating population of sunflower. Pak. J. Agric. Res., 18: 61-65.
Direct Link |
17: Smith, P.G. and A.H. Millet, 1964. Germination and sprouting responses of cotton at low temperature. J. Farm. Soc. Hortic. Sci., 84: 480-484.
18: Mock, J.J. and S.A. Eberhart, 1972. Cold tolerance of adopted maize populations. Crop Sci., 12: 466-469.
19: Steel, R.G.D. and J.H. Torrie, 1984. Principals and Procedures of Statistics: A Biometrical Approach. McGraw Hill Book Co., New York, USA.
20: Robinson, H.B., R.E. Comstock and P.H. Harvey, 1951. Genotypic and phenotypic correlations in corn and their implications in selection. Agron. J., 43: 283-287.
21: Lothrop, J.E., R.E. Atikins and O.S. Smith, 1985. Variability for yield and yield components in IAPIR grain sorghum random mating population. I: Means, variance components and heritabilities. Crop Sci., 25: 235-240.
22: Diaga, N. and Ejeta, 2003. Genetic variation and relationships among seedling vigour traits in sorghum. Crop Sci., 43: 824-828.
Direct Link |
23: Ahmad, N., 2000. Evaluation of S1 progenies of maize (Zea mays L.) for seedling traits under water stress. M.Sc. Thesis, Univ. Agric. Faisalabad, Pakistan.
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