The Comparative Study of the Various Discrimination Indices of Some Related Maize Lines Created at ARDS Turda

Andrei Varga, Ioan Rotar, Mircea Savatti, Voichița Haș, Roxana Călugăr, Carmen Vana, Ana Copândean, Emilia Tinca, Ionuț Racz, Ioan Haș

Abstract


Differentiation of maize inbreeds in order to assess their degree of relationship and their classification in germoplasm groups or in heterotic groups is performed by different methods. For the primary differentiation the method of pedigree is used, which gives us information on the origin of the initial material of selection. Assessing the degree of relationship of a set of lines created din SRR Comp. A (Comp. B) and Tu SRR Comp. B (Comp. A) and the heterosis study of the hybrids resulted from the inbred lines obtained from Tu SRR Comp. A (Comp. B) and Tu SRR Comp. B (Comp. A). The biological material used is represented by F1 hybrids realised in some radial crossbreeding systems of type (4) p (p-1) / 2 respectively 8 inbred lines, 28 hybrids tested in 2 years and 4 repetitions. The field experiences on the hybrids were performed at ARDS Turda in the years 2013-2014, after the model of randomized blocks, in four repetitions, on a plot size of 7.0 m2, at a density of 60,000 plants / ha. Calculation of heterosis for grain yield was the lowest value identified in crossing lines TD 337 x TA 426 obtained from Tu SRR Comp. A (Comp. B) x Tu SRR Comp. A (Comp. B) 36.5% which shows that these lines are close in terms of genetic (by Musteata and Mistret, 2002), and the value of 184.7% of heterosis for grain yield that we meet F1 hybrids made between lines Tu SRR Comp. A (Comp. B) x Tu SRR Comp. B (Comp. A) it shows that these lines are alternative groups of genetically (by Musteata and Mistret, 2002). After the heterosis calculation of the characters studied the highest value was found in the case of the crossbreeding lines obtained from Tu SRR Comp. A (Comp. B) x Tu SRR Comp. B (Comp. A) and the lowest values of heterosis derived from crossbreeding of the lines obtained from the same composite Tu SRR Comp. A (Comp. B) or Tu SRR Comp. B (Comp. A).


Keywords


composite, heterosis, relationship

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