Stability Parameters for Yield and its Components

Abstract

Nine varieties of rice were used in this study, eight introduced from Vietnam, 93-1,93-2, 93-3, Quannaty, Mu, T26, Goma61 and Amstad82, and the local one Anber33, to investigate the comparative genotype x environment interaction and to estimate broad sense heritability and stability parameters for: no. days to 50% flowering, plant height, no. grains per spike, no. spikes per m 2 , spike length, 1000 grain weight, biological yield, harvest index and grain yield, and estimates simple linear correlations among them. The varieties were grown through the season 2008 in eight environments (combinations between two locations, Al-Mishkhab and Al-Muthana, and four irrigation intervals, flooded, 2,4 and six days) using randomized complete block design with three replications. A combined analysis of variance results showed highly significant difference among varieties and environments, and highly significant genotype x environment interactions for all studied characters. Broad sense heritability was high for all characters and ranged from 86.695% for harvest index to 99.587% for spike length. Grain yield had positive significant correlations with no. grains per spike, no. spikes per m 2 , 1000 grain weight, biological yield and harvest index. The results of stability parameters showed that the introduced varieties Quannaty and Mu were stable and fit for different environment for larger number of studied characters, and the varieties 93-1, T26 and Goma61 showed high stability for grain yield of rice.

Genetic Path Coefficient Analysis of Genotypes of Rice (Oryza sativa L.) Grown in Iraqi Conditions

“…To know the true relationship between the independent changes and the dependent variable, it is necessary to segment the correlations between them into a direct effect of a particular independent variable (measured traits) on the dependent variable, an attribute (grain yield) and other indirect effects through other independent variables, through the path factor analysis Al-Zubaidy and Al-Juboury [2]. It was found Dawood et al [3] that the grain yield had a highly significant positive correlation with the traits of the number of grains/plant and the weight of 1000 grains. In the study of genetic path coefficient analysis.…”

“…(**) Significant at 1% probability level Table(3) presents the averages of the twenty-two genotypes for twelve rice traits. The genotype APA1 was significantly excelled on all genotypes by giving the highest plant height of 134 cm, the largest area of the flag leaf was 38.59 cm, the highest mean of the panicles length was 31.40 cm and the highest number of grains in the panicles reached 273.87 grains panicles -1 , but APA1 showed no significant difference from The Dejla genotype 269.33 grains.…”