Genetic variability, general performance and interrelationships of grain yield and its components of nine inbred lines of maize under Striga infested and non-infested soil

Sara, A.M. Karrar, Mohammedein B. Alhussein, Abu Elhassan S. Ibrahim, Eltahir S. Ali

Abstract


Nine inbred lines of maize were evaluated at the Gezira Research Station (GRS), Agricultural Research Corporation (ARC), Wad Medani, Sudan, under Striga non-infested (normal conditions) and infested (stress conditions) soil for seasons 2008 and 2009. A randomized complete block design with three replicates was used. The objective was to estimate the general performance, genetic variability and interrelationships of grain yield and its components. Data were collected on days to 50% tasseling, plant height, ear height, ear length, 100 kernels weight and grain yield. The traits showed significant differences under normal conditions with the exception of ear height in 2008 and grain yield in 2009. Under stress conditions and in 2008, the traits showed no significant differences except for days to tasseling but in 2009, the traits showed significant differences in plant height, ear length and 100 kernel weight. Over seasons, the mean across conditions in grain yield ranged between 425-1181 kg/ha in 2008 and 575-1320 kg/ha in 2009. Line TZSTR148 showed the highest grain yield (1181 kg/ha) as well as early flowering and short plants in 2008, while Line TZSTR133 showed the highest grain yield (1320 kg/ha), early flowering and short plants in 2009. In both seasons under normal and stress conditions, grain yield was highly significantly and positively correlated with plant height, ear height and ear length. Lines TZSTR133 and TZSTR138 were early maturing, short and high yielders and hence were suggested as parents to develop high yielding hybrids after studying their combining ability under conditions of low rainfall environments.

 


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