The present research work was carried out at Southern Wheat Research Station, Tandojam during the growing season 2013-14 in order to work out correlation and regression analysis for yield traits in wheat genotypes. The experiment was laid out in a Randomized Complete Block Design with three replications. Eight bread wheat genotypes such as Mehran, Sarsabz, TJ-83, SKD-1, Inqlab, A. Sattar, Sehar and Sassui were used to examine correlation and regression. Seven traits, viz.; plant height, tillers plant −1 , spike length, spikelet's spike −1 , grains spike −1 , seed index and grain yield plant −1 were studied. The analysis of variance revealed significant differences among the genotypes for plant height, tillers plant −1 , spike length, spikelet's spike −1 , grains spike −1 , seed index and grain yield plant −1. Based on mean performance, variety Sarsabz gave maximum plant height (95.46), produced maximum tillers plant −1 (4.40), gave more grain spike −1 (63.13), TJ-83 gave highest seed index (47.260), and was next ranker in spike length −1 (12.07), spikelet's spike −1 (19.13), grains spike −1 (59.86), and grain yield plant −1 (9.86) among the genotypes. The phenotypic correlations revealed that tillers plant −1 and grains spike −1 were highly positively associated; hence these yield components can be used as reliable selection criteria to improve grain yield in wheat. Thus estimation of correlation and regression analysis among yield and yield components may provide effective selection criteria to improve wheat grain yield. The results from correlation and regression of plant height indicated significantly positive association with spikelet's spike −1 , tillers plant −1 and grains spike −1 which revealed that increase in plant height will cause corresponding increase in associated traits.

The heterosis, heterobeltiosis, general combining ability (GCA) and specific combining ability (SCA) were examined during Rabi (crop season) of 2013-2014 in hexaploid wheat genotypes. The experiment for this study was conducted at the Botanical Garden, Department of Plant Breeding & Genetics, Sindh Agriculture University Tandojam, Pakistan. The breeding material was comprised of four parents (Imdad, TD-1, SKD-1, and Moomal). These parents were crossed in half partial mating fashion; thus, six possible cross combinations (F1s) were obtained (Imdad × TD-1, Imdad × SKD-1, Imdad × Moomal, TD-1 × SKD-1, TD-1 × Moomal, and SKD-1 × Moomal). A three-replicated RCB Design was used. The mean squares corresponding to different traits of various hexaploid wheat genotypes indicated significant (P < 0.01) GCA (parents) and SCA (F 1 hybrids) effects for the characters (plant height, tillers plant −1 , spike length, spikelets spike −1 , seeds spike −1 , seed index, and grain yield plant −1). The mean performance of F 1 hybrids differed significantly (P < 0.01) for all the traits studied. Among the parents, Imdad and TD-1 proved to be better general combiners for almost all the studied traits. In regards to SCA effects, the F 1 hybrids Imdad × TD-1 and Imdad × SKD-1 expressed higher SCA and heterotic effects for most of the studied traits.

The current investigation was carried out to analyse the coefficient and partitioning of direct and direct effect of yield component and earliness traits in the genotypes of wheat. Current research was conducted at experimental area of Southern Wheat Station Tandojam, during the year 2014-15 in (RCBD) Randomized block design having 3 replications. The total 8 genotypes of wheat viz., Sarang, NIA amber, TD -1 , Benazir, Soghat, Anmol, Imdad-05 and Kiran-95 were used to examine correlation and path analysis. Nine traits, namely, days to 75%heading, days to 75% maturity, height of plant -1 , plant-1 tillers, length of spikes, yield of gain plant -1 , spikelets spike -1 , seed index and gains spikes -1 were recorded. Analysis of variance was found significantly different among the traits of genotypes of current research. Mean performance based on the variety TD -1 was showed better production in the term days of (75%) heading days and maturity (75%), number of seed index and spike -1 spikelet's. Whereas the variety Anmol was found best result in all tiller plants -1 number, grain spike -1 quantity and all yield grain plant -1 , therefore mention verities may because favourable for hybridization to produce new wheat promising verities. The results for phenotypic correlation showed seed index and tiller plant-1 were positive and high correlated with grain yield plant -1 , hence components of yield can be consider as selective tool for bringing progress in wheat grain production of this crop. Analysis of path coefficient showed the direct effect of grain plant -1 yield was quickly found by the spikep -1 grains 0.8320 followed by index of seed 0.1886, whereas the result of spikelet's spike-1 was observed positively influence on the yield of grain. In controversial the highest negatively influence was observed by plant-1 tillers number 0.3702, followed by the height of plant 0.0836 and length of spike 0.3813 that is why, direction genotypes selection for the yield of grain because of spikelet's spike-1, index of seed and grains of spike -1 .