Genetic and phenotypic relationship between grain yield and components of grain yield of maize (Zea mays L.)

Abstract

For efficient selection of grain yield, like the most importance economic trait, in regard to its on the great influence the environmental factors, has complex mode of inheritance and low heritability, is necessary to know genotypic and phenotypic coefficient of correlations between grain yield and morphological traits of the plant and ear which are influencing on the grain yield. The objective of this paper was to determine relationship between grain yield and morphological traits, in 8 inbred lines and their hybrids. Strong genetic and phenotypic correlations were found between grain yield and other studied traits, except between grain yield, on one side, and kernel row number where we found medium correlations. Between other studied traits, the highest values of genotypic and phenotypic coefficient of correlations were found between ear length and cob weight

Genetic Variability and Correlation Studies of Grain Yield and Related Agronomic Traits in Maize

“…Generally, correlations among traits are attributed to the genetic nature (pleiotropic effects, linked genes) and environmental factors. The phenotypic correlations arise from genetic and environmental factors and can be marked out by measuring the phenotype while the genetic correlations arise from genetic factors because they give us information about level of relationship between two traits which is additive; crucial in ensuring effective selection (Bocanski, et al, 2009). The positive relationships noted among some of these traits indicated that the desirable genes influencing their inheritance in these hybrids could be exploited in further breeding activities for varietal improvement (Sujiprihati et al, 2003).…”

“…The maize yield character is influenced by several genes which also interact with various environmental conditions (Bocanski et al, 2009). Thus, the yield has a multiplicative effect on the end product of many factors otherwise referred to as yield components (Zeeshan et al, 2013).…”

“…These yield components are simply inherited with minimal environmental deviations, and hence selection based on them is more appropriate as opposed to the yield per se (Nagabhushan et al, 2011). The assessment of performance of parental lines based on the yield components could aid in the selection of superior parents for the production of better yielding hybrids (Bocanski et al, 2009). This can successfully be achieved if the genetic parameters which govern inheritance of important agronomic traits are established (Mahiboobsa et al, 2012).…”

“…The coefficient of variation shows the extent of variability represented by the different characters but it excludes the heritable portion. Conversely, the coefficient of correlations help to measure the level of relationships between the traits and also establish the level at which these traits are mutually different (Bocanski et al, 2009;Nagabhushan et al, 2011). The correlations also give reliable and useful information on nature, extent and direction of selection (Zeeshan et al, 2013).…”

Correlation and path coefficient analysis of top-cross and three-way cross hybrid maize populations

“…In order to achieve effective selection for grain yield, it is important to determine its relationship with other traits. The determination of correlation coefficients helps to measure the level of relationships among traits and to establish the level at which these traits are mutually different (Bocanski et al, 2009;Nagabhushan et al, 2011). Correlation coefficients give reliable and useful information on the relationship between the traits in terms of the nature, extent and direction of selection (Zeeshan et al, 2013).…”