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Barley Genetics Newsletter 37:1-4 (2007) Aniol A. 1997. the aluminum tolerance in wheat. plant Breeding: Theories, achievements and problems. Proc. Int. Conf., Dotnuva - Akademija, Lithuania: 14-22 Ригин Б.В., Яковлева О.В. 2001. Генетические аспекты толерантности ячменя к токсичным ионам алюминия [Genetic aspects of barley tolerance against toxic Al ions] Генетические ресурсы культурных растений. Межд. науч.-практ. конф., 13-16 ноября, С-Пб: 397 [In Russian] Minella E., Sorrells M.E. 1997. Inheritance and chromosom locationof Alp. A gene controlling aluminum tolerance in 'Dayton' barley. Plant Breeding, V.116: 465-469 Reid D.A. 1971. Genetic control of reaction to aluminum in winter barley. Barley Genetics II – Proc. 2 nd Int. Barley Genetics Symp., Pullman, Wash.: 409-413 Stolen O., Andersen S. 1978. Inheritance of tolerance to low soil pH in barley. Hereditas, V.88. 101-105 Gourley L.M., Rogers S.A., Ruiz-Gomez C., Clark R.B. 1990. Genetic aspects of aluminum tolerance in sorghum. Plant Soil, V.123: 211-216. Petr F.C., Frey K.J. 1966. Genotype correlations, dominance and heritability of quantitative characters in oats. Crop Sci., V.6. 259-262 Bona L., Carver B.F., Wright R.J., Baligar V.C. 1994. Aluminum tolerance of segregating wheat populations in acidic soil and nutrient solutions. Communic. Soil Sci. Plant Anal., V.25. 327-339 Camargo C.E.O. 1981. Wheat improvement. 1. The heritability of tolerance to aluminum toxicity. Bragantia, V.40. 33-45 Camargo C.E.O. 1984. Wheat improvement. IV. Heritability studies on aluminum tolerance using three concentrations of aluminum in nutrient solutions. Bragantia, V.44. 49-64 Lisitsyn E. M. 2000. Intravarietal Level of Aluminum Resistance in Cereal Crops. J Plant Nutrit., V.23(6): 793-804 4
Barley Genetics Newsletter 37:5-20 (2007) Frequency distributions and composite interval mapping for QTL analysis in ‘Steptoe’ x ‘Morex’ barley mapping population ABSTRACT H. S. Rao 1, 2† , O. P. Basha 1 , N. K. Singh 1 , K. Sato 3 , H. S. Dhaliwal 1 * Indian Institute of Technology Roorkee, UA, India 1 <strong>Department</strong> of Biotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, Uttaranchal, INDIA 2 Present address: 101, Maize Genetics Unit, Division of Genetics, LBS Building, Indian Agricultural Research Institute, New Delhi 110012, INDIA 3 Barley Germplasm Center, Okayama University, Kurashiki 710-1146, JAPAN *corresponding author Email: hsdhafbs@iitr.ernet.in FAX: 91-1332-273560 Tel.: 01332-285259 † Additional author Email: hsr_f12@rediffmail.com With the advancement of QTL mapping strategies, the traditional approaches for the identification of genes and their effects responsible for trait expression are gradually losing significance. The phenotypic data for heading days, plant height, peduncle length, number of tillers and stripe rust was recorded on 150 recombinant inbred line (RIL) population developed from a barley cross of ‘Steptoe’ and ‘Morex’. Preliminary examinations of frequency distribution plots were fairly useful in the prediction of number of genes governing traits expression in barley (Hordeum vulgare L.). The predictions were then systematically confirmed through QTL mapping. Molecular marker data for the population available at the public domain (<strong>GrainGenes</strong> website) was used for the construction of linkage map and QTL analysis. Clear colinearity was observed between the number of QTLs identified and the number of genes predicted based upon frequency distribution study alone. A total of 17 QTLs were detected for the five traits evaluated. Several major QTLs were detected on chromosome 2H, which could serve as candidate for mapbased studies of phenomena such as pleiotropism, recombination hot spots, gene-rich regions and QTL clustering. Keywords. Barley, frequency distribution, quantitative trait loci, recombinant inbred line, peduncle length, stripe rust, gene rich region. INTRODUCTION Cultivated barley (Hordeum vulgare L.) is a diploid (2n=14) which ranks fourth among the most important cereal crops in the world after rice, wheat and maize. Barley belongs to the same tribe Triticeae as that of wheat and rye and it resembles wheat in many respects. Barley is however, more tolerant to soil salinity and drought than wheat. Many important traits of economic and agronomic importance in barley are quantitative in nature displaying continuous 5
Page 1 and 2: Barley Genetics Newsletter Volume 3
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Page 37 and 38: References Bhatnagar, V. K., Sharma
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