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Correlations between some yield components and grain yield of maize s 2 families and their hybrids



Correlations between some yield components and grain yield of maize s 2 families and their hybrids



Novenytermeles 40(3): 203-210



The yield components and grain yield of 18 S2 families produced from Pioneer hybrid 3925 SC and of their hybrids produced by two non-related testers were studied. The characteristics tested: ear length, ear diameter, number of grain rows, grain number per row, grain (kernel) length, thousand-kernel-weight and grain yield. It was stated that in contrast to the other tested components, in ear length the average of S2 damilies (13,35 cm) could be considered equal with that of their hybrids (13,04, 13,28 cm, resp.). No heterosis effect was found in ear length of hybrids produced by the two testers. There was no reliable difference in ear length, ear diamter, grain yield between the averages of hybrids produced on T1 and T2 testers. In S2 families in both years the ear length, the grain number per row and the kernel length were in positive, significant correlation with the grain yield. But the correlation between the yield components of S2 families and grain yield of their hybrids was not found as reliable. From the same yield components of S2 families and of their hybrids, the correlation only between the ear length and thousand-kernel-weight - independently of year and tester - was positive and reliable. In grain yield between S2: (T1 .times. S2) in both years the correlation co-efficient was r = 0.18 (NS), between S2: (T2 .times. S2) in 1987 r = 0.45 (P = 5%), in 1988 r = 0.24 (NS). Based on the data it may be concluded that in segregating populations the selection for yield components (firstly ear length, kernel length and grain number per row) makes possible to produce strains with higher productivity, but that does not mean directly the increase of grain yield of hybrids. The correlaton reliability between the grain yields of test crossings and S2 parents may change depending on testers and years. There is a connection between the correlation co-efficients that indicate the closeness of correlation between yield elements and grain yield of hybrids produced by two testers and the values of MQ on S2 effects: MQ values on S2 .times. tester for the same character. The higher the value of MQ is, the higher the correlation co-efficient is.

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