TAILIEUCHUNG - Heterotic grouping and patterning of quality protein maize inbreds based on genetic and molecular marker studies
In genetic diversity analysis using simple sequence repeat markers, the inbreds of the best hybrid, UQPM 20 × UQPM 18, lay in same cluster but different subclusters. Correlations between genetic distance and sca effects were low for grain yield, which hampers the prediction of heterosis from molecular data alone. | Turkish Journal of Biology Research Article Turk J Biol (2014) 38: 10-20 © TÜBİTAK doi: Heterotic grouping and patterning of quality protein maize inbreds based on genetic and molecular marker studies 1, 2 2 2 Ambika RAJENDRAN *, Arunachalam MUTHIAH , John JOEL , Ponnusamy SHANMUGASUNDARAM , Dhandapani RAJU 1 Directorate of Maize Research, Pusa Campus, New Delhi, India 2 Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore, India 3 Directorate of Seed Research, Mau, Uttar Pradesh, India Received: Accepted: Published Online: 3 Printed: Abstract: An investigation was done to study the heterotic grouping and patterning in quality protein maize inbreds. Biochemical screening resulted in the choice of 3 inbreds each with high (UQPM 2, UQPM 4, and UQPM 21) and low (UQPM 18, UQPM 19, and UQPM 20) lysine and tryptophan contents respectively for genetic studies using diallel analysis. UQPM 20 × UQPM 18 was notable as it possessed high standard heterosis and specific combining (sca) effect for grain yield, protein, tryptophan, and lysine. Based on yield sca, the 6 parental inbreds were classified into 3 heterotic groups. Intergroup cross UQPM 20 × UQPM 18 was the best in yield and quality. The superior heterotic pattern was flint × dent. In genetic diversity analysis using simple sequence repeat markers, the inbreds of the best hybrid, UQPM 20 × UQPM 18, lay in same cluster but different subclusters. Correlations between genetic distance and sca effects were low for grain yield, which hampers the prediction of heterosis from molecular data alone. Key words: Heterotic group, heterotic pattern, quality protein maize, genetic diversity 1. Introduction Maize (Zea mays L.; 2n = 20) is a principal cereal crop in tropical and subtropical regions throughout the world. The increasing use of maize as a staple food is reflected through the
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