Estimation of Correlation and Path coefficient for hybrids of maize(Zea mays) under conditions industrial infection by large corn stem borer Sesamia cretica

It was evaluated the susceptibility of 6 lines of maize, and fifteen maize crosses, against by large corn stem borer, Sesamia cretica Led under conditions Industrial infection. A study of the correlation coefficient showed linear relationship of yields by 100- Kernel weight.

The phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes

The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e. Damascus and Dir Al-Zor under three nitrogen fertilization levels (130, 195 and 260 of N. ha-1), The nitrogen fertilizer was applied at two splits. Split split plot design was used with 4 replications. Results of phenotypic correlation values showed that grain yield at Damascus location was positively and significantly associated with ear height (r= 0.204**), ear length (r= 0.205**) and number of rows per ear (r= 0.228**). On the other hand, grain yield at Dir Al-Zor location was positively and significantly associated with all studied traits at combined data whereas, it was positively and significantly associated with ear length at three levels and combined data (0.305*, 0.410**, 0.347** and 0.375**, respectively). The data of path coefficient analysis showed that ear length, ear height and number of rows per ear had positive direct effects on grain yield variation and thus grain yield improvement can be achieved through selection for ear length and ear height at Damascus location (11.06%). On the other side, data showed that each of ear height, number of kernels per row and 100-kernel weight had positive direct effects on grain yield variation (32.98%) and thus, 100-kernel weight can be considered as selection criteria may lead to the improvement of grain yield in yellow maize at Dir Al-Zor location.

Genetic variance, heritability, correlation and path coefficient analysis in some Bread Wheat Crosses (Triticum aestivum L.)

The present investigation was conducted during 2010/2011 and 2011/2012 growing seasons at Karahta station for field crops research, General Commission for Scientific Agricultural Researches (G.C.S.A.R.), Syria. Forty five hybrids F1 produced using a half diallel cross among ten bread wheat (Triticum aestivum L.) genotypes, in 2010/2011 season, were evaluated during 2011/2012 season in order to study som of the genetic parameters for grain yield per plant, its components, some morphophysiological and quality traits to determine the basic criteria for selection.

The phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes

The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e.

Heterosis, potence ratio, phenotypic correlation and path coefficient analysis for grain yield and it's components in barley (Hordeumvulgare L. )

A half diallel set of crosses among six highly diverse barley (Hordeum vulgare L.) genotypes were evaluated at Karahta Research Station, General Commission of Scientific Agricultural Research (GCSAR), during 2010-2011 and 2011-2012 seasons to study heterosis, potence ratio, correlations among traits and path coefficient analysis for number of spikes per plant, number of grains per plant, number of grains per spike, biological yield ,and grain yield per plant. Heterosis effects for seed yield ranged from%-89.52 (T-6669×S-6303) to%16.99 (Arabi abiad mohsan×S-6689) and from%-49.94 (L-6711×S-6689) to %-1. 35 (Arabi abiad mohsan×S-6689) relative to mid and better parents respectively. Potence ratio values ranged from 1.14 (number of spikes per plant) to 3.50 (biological weight) indicating that non-additive gene action was more important in controlling all studied traits. Correlation coefficients among traits indicated that seed yield was positively and significantly associated with each of number of spikes per plant (0.289), number of grains per plant (0.832), number of grains per spike (0.587), and biological yield (0.708) traits. Path coefficient analysis indicated that number of grains per plant trait had high positive direct effects on grain yield.

Variability, correlation and path coefficient analysis of some yield traits in hybrids of durum wheat (Triticum durum L.)

This study was carried out at Karahta Station of Field Crop Research, General Commission of Agricultural Scientific Researches during 2010-2011 and 2011-2012 cropping seasons in order to determine the phenotypic correlation coefficient between the traits and the path coefficients analysis for the most affected traits in grain yield.

Heritability, genetic advance, phenotypic correlation and path coefficient analysis for some quantitative traits in two hybrids of maize (Zea mays L.)

The experiment was carried out at two planting dates in a Randomized Complete Blocks Design with three replications at Maize Research Department, General Commission for Scientific Agriculture Researches (G.C.S.A.R.) Damascus, Syria, during two cropping season 2011 and 2012 to study the phenotypic and genotypic coefficients of variation, heritability, genetic advance, phenotypic correlation and path coefficient analysis for grain yield per plant, its components and the height of plant and ear of two maize hybrids (IL.292-06 × IL.565-06, IL.459-06 × IL.362-06).

Prediction of combining ability in some maize (Zea mays L.) inbred lines using top-cross method under different environments

This research was carried out to evaluate the combining ability of twentyfive inbred lines of yellow maize and estimate the phenotypic correlation and path analysis of twenty-five top crosses were formed during 2009 growing season at Dir Ala, Dead Sea. Jordan. Their plants were evaluated in Syria during 2009 growing season in three locations (Al Raka, Aleppo and Dir Al- Zor).