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Present investigation was conducted to study the genetic variability for grain yield, its component traits and slow rusting component in advanced backcross segregating lines of bread wheat at AICRP on wheat, MARS, UAS, Dharwad, Karnataka during Rabi season of 2015-2016. The study revealed highly significant differences for the yield, its component traits and for slow rusting components, indicating the presence of sufficient genetic variability in these lines which is basis for the effective selection in any breeding programme. High genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) values coupled with high heritability and high genetic advance over mean were recorded for some of the studied traits such as grain yield per plant and no. of productive tillers per plant. Also high PCV and GCV along with high heritability and high genetic advance over mean (GAM) was found for the slow rusting components. The presence of sufficient variability along with high heritability for all these traits indicates that simple phenotypic selection for these traits may be effective for genetic improvement of these traits. Hence based on present findings it can be concluded that practicing selection considering the traits like productive tillers per plant, grain yield per plant along with slow rusting components will be more beneficial for achieving durable type of resistance in future breeding programme.
Singh SP, Singh LR, Yadav VK, Singh Geeta, Kumar R, Singh PB. Combining ability analysis for yield traits in bread wheat lines (T. aestivum em Thell). Prog. Agric. 2002;2(2):119-121.
Dyck PL. The association of a gene for leaf rust resistance with the chromosome 7D suppressor of stem rust resistance in common wheat. Genome. 1987;29:467-469.
Singh RP, MujeebKazi A, Huerta-Espino J. Lr46: A gene conferring slow-rusting resistance to leaf rust in wheat. Phyto-pathology. 1998;88:890-894.
Hiebert CW, Thomas JB, McCallum BD, Humphreys DG, DePauw RM, Hayden MJ, Mago R, Schnippenkoetter W, Spielmeyer W. An introgression on wheat chromosome 4DL in RL6077 (Thatcher*6/PI 250413) confers adult plant resistance to stripe rust and leaf rust (Lr67). Theor. Appl. Genet. 2010;121:1083-1091.
Herrera-Foessel SA, Lagudah ES, Huerta-Espino J, Hayden M, Bariana HS, Singh D, Singh RP. New slow rusting leaf rust and stripe rust resistance genes Lr67 and Yr46 are pleiotropic or closely linked. Theor. Appl. Genet. 2011;122:239-249.
Herrera-Foessel, SA, Singh RP, Huerta-Espino J, Rosewarne GM, Sambasivam KP, Viccars L, Calvo-Salazar V, Lan Caixia, Lagudah ES. Lr68: A new gene conferring slow rusting resistance to leaf rust in wheat. Theor. Appl. Genet. 2012;124:1475-1486.
Singh RP, Herrera-Foessel S, Huerta-Espino J, Bhavani S. Race non-specific resistance to rust diseases in CIMMYT spring wheats. Euphytica. 2011;179:175-186.
Kumar A, Biradar SS, Kumar KY, Desai SA, Patel BN, Deepak DA, Tigga A. Studies on genetic variability and heritability for yield and yield attributing traits in advanced backcross segregating populations in bread wheat (Triticum aestivum L.). Int. J. Curr. Microbiol. App. Sci. 2017;6(10):3664-3670.
Federer WT. Sampling, blocking and model considerations for split plot and split block designs. Biometrical J. 1977;19:181–200.
Burton GM, Devane EM, Estimating heritability in tall Fescue from replication clonal material. Agron. J. 1953;45:478-481.
Johnson HW, Robinson HF, Comstock RE. Estimates of genetic and environmental variability in soybean. J. Agron. 1955;47: 314-318.
Sivasubramanian S, Menon M. Heterosis and inbreeding depression in rice. Madras Agric. J. 1973;60:1139.
Lush JL. Heritability of quantitative characters in farm animals. Heriditas (Suppl.). 1949;35:256-261.
Hanson WD, Robinson HF, Comstock RE. Biometrical studies on yield in segregating population of Korean lespedesa. Agron. J. 1956;48:268-272.
Joshi LM, Singh DV, Srivastava KD. Manual of Wheat Disease, Malhotra Publishing House, New Delhi. 1988;75.
Wilcoxson RD, Skovmand B, Atif AH. Evaluation of wheat cultivars for ability to retard development of stem rust. Ann. Appl. Biol. 1975;80:275-281.
Arati Y, Hanchinal RR, Nadaf HL, Desai SA, Suma B, Rudra NV. Genetic variability for yield parameters and rust resistance in F2 population of wheat (Triticum aestivum L.). International Quarterly the Bioscan. 2015;10(2):707-710.
Navin K, Shailesh M, Vijay K. Studies on heritability and genetic advance estimates in timely sown bread wheat (Triticum aestivum L.). Journal Bioscience Discovery. 2014;5(1):64-69.
Deepak Koujalagi, Desai SA, Biradar SS, Naik VR, Yashvantha KJ, Sathisha TN, Chourasia KN. Study of genetic variability parameters in different segregating generations of bread wheat (Triticum aestivum L.) Environment & Ecology. 2017;35(3B):2056-2060.
Alemu Dabi, Firew Mekbib, Tadesse Desalegn genetic variability studies on bread wheat (Triticum aestivum L.) genotypes J. Plant Breed. Crop Sci. 2019; 11(2):41-54.
Yashavantha KJ. Introgreesion studies related to durable leaf rust resistance and identification of new sources for slow rusting leaf rusting in bread wheat (Triticum aestivum L.). Ph. D. Thesis, Univ. Agri. Sci. Dharwad, Karnataka (India); 2015.