Correlation and Path Coefficients among Quantitative Traits in Wheat (<i>Triticum aestivum</i> L.)

Abstract

Since many of the quantitative plant characters of economic values are highly influenced by environmental condition, the progress in breeding in such a population is primarily conditioned by the magnitude, nature and inter-relations of genotypic and non-genotypic variations in plant characters. Therefore we estimated phenotypic, genotypic and environmental correlation coefficients and path coefficients among eight quantitative traits of bread wheat to make selection efforts more efficient. These traits were measured in 30 wheat genotypes, which were laid out in a randomized block design with three replications in Khumaltar, Kathmandu during 2003. The highest genotypic correlation (0.81) was between heading and maturity days. Tiller number was negatively correlated with grain number per spike (-0.78) at genetic level. Phenotypically, number of grains and grain weight per spike showed the largest coefficient (0.92) and maturity days exhibited negative association with plant height (-0.37). Environmental correlation coefficient was the highest between tillers number and grain yield (0.5) and heading days showed negative relationship with grain yield (-0.28). It indicates that number of tiller and grains per spike are the most important traits for yield. In most of the cases, genotypic correlations were higher than phenotypic correlations. Maturity days exerted the greatest influence (2.41) directly upon yield. Negative direct effect of heading days and positive effect of tiller number on yield was also considerable on magnitude. Indirect effect of heading days via maturity days was the highest followed by spike grain weight via maturity on grain yield. Results showed that grain filling period is an important factor and number of tillers and grains per spike should also be considered during selection for getting high yielding genotypes.

Nitrogen fertilizer influence on wheat yield and use efficiency under different environmental conditions

“…These traits were important for selection and breeding criteria to GY improving. Many authors reported that in wheat grown in the different environments GY was significantly correlated with NSS and TGW (Lad et al, 2003;Kashif and Khaliq, 2004;Aycecik and Yildirim, 2006;Akram et al, 2008;Joshi et al, 2008;Wu et al, 2012). Contrary to our research, Shahid et al (2002), Akram et al (2008), and Joshi et al (2008) reported that GY was negatively correlated with PH.…”

“…Many authors reported that in wheat grown in the different environments GY was significantly correlated with NSS and TGW (Lad et al, 2003;Kashif and Khaliq, 2004;Aycecik and Yildirim, 2006;Akram et al, 2008;Joshi et al, 2008;Wu et al, 2012). Contrary to our research, Shahid et al (2002), Akram et al (2008), and Joshi et al (2008) reported that GY was negatively correlated with PH. In regard to traits for which no significant correlation was determined (PH with RUE and NAE, SL with TGW, NS m -2 and GY, NSS with RUE and NAE, NGS with TGW, NS m -2 , GY, NAE and NUE, WGS with NAE and NUE, TGW with NUE, NS m -2 with RUE, NAE and NUE, and RUE with NAE and NUE), it is possible to conduct simultaneous selection/breeding for both traits.…”

Variability Study of Biofortified Bread Wheat Genotypes for Grain Zinc and Iron Concentration, Yield and Yield Associated Traits at Khumaltar, Lalitpur, Nepal

“…From this research, genotypic correlation between grain yield and thousand grain weight was found significant negative (-0.48***) which reveals genotypes having higher yields has higher number of grains. Negative correlation between thousand grain weight and grain yield was also reported by Mohammadi et al, (2012) ; Khan, Azam, & Ali, (2010) but significantly positive correlation between thousand grain weight and grain yield was reported by Joshi et al, (2008); Kashif & Khaliq, (2004). Based on the mean performance, correlation and regression analysis grain yield could be increased by selection based on number of effective tiller per m 2 , plant height, number of grains per spike, grain weight per spike.…”

“…Similarly, strong phenotypic correlation of grain yield was found with effective number of tillers per m 2 (0.658***) and plant height (0.424**). According toJoshi et al, 2008, the number of effective tiller and grains…”

Correlation and path coefficient analyses of grain yield and its related components for some common winter wheat genotypes

“…noted that the grain yield had a positive correlation with the spike length and the thousand-kernels weight, while according toShara et al (2016), the 1000 kernel weight was in a negative relationship with the grain yield. The positive correlation of the plant height with the grain yield was recorded byNasri et al (2014), while the negative byJoshi et al (2008) andChitralekha et al (2017) Tsenov et al (2009),Rachovska and Uhr (2010). Chamurliyski et al (2011) and Nukasani et al (…”