Factor analysis for yield contributing traits in maize (Zea mays L.)
Keywords: Maize, Factor analysis, Principal components and varimax rotation
AbstractData collected on 17 traits from 144 inbred lines derived using 4 different base populations of unknown pedigree were
subjected to factor analysis. Sixteen factors were extracted using principal component analysis as extraction method. Out of
16, only 5 factors had eigen value greater than one and these factors alone accounted for 78.3% of total variance. The
loadings of each variable onto each factor was analysed from the rotated factor matrix obtained through varimax rotation.
First factor accounted for 22.93% of the total variation and showed significant associations of traits related to duration
namely days to 50% tasseling, days to 50% silking, anthesis silking interval and days to maturity. Second factor with
19.22% of total variation had higher loadings of plant height and ear height which are the important growth traits in maize.
Factor 3 with a contribution of 17.91% to total variation was found to be significantly associated with the important yield
traits viz. cob yield/plant, grain yield/plant and ear girth. Factor 4 (9.99% variance) and factor 5 (8.33% variance) were
loaded mainly with hundred seed weight and grain setting length respectively.
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