|
|
|
|
|
 |
Search published articles |
 |
|
Showing 2 results for Genetic Parameters
Peyman Sharifi, Hashem Aminpanah,
Volume 3, Issue 2 (3-2017)
Abstract
In order to investigate yield stability, genotype×environment interactions and estimation of a number of genetic parameters related to yield and yield components, seven promising rice lines together with Shirodi and line 843 (as control cultivars) were evaluated. The experiment was carried out base on randomized complete block design with three replications in three locations of Mazandaran province, Iran (Tonekabon, Amol and Sari) during three growing seasons from 2012 to 2014. Analysis of variance revealed that there were significant differences among genotypes for yield at almost all three locations. Combined analysis of variance indicated that there were no significant differences among locations and years, whereas year×location×genotype interaction was found significant for grain yield, plant height and thousand grain weight. Results of stability analysis by univariate methods showed that genotype number 6 was the most stable genotype over all three locations, having less variance within locations and smaller coefficients of variance and a high grain yield (6020.8 kg ha-1 ). The high coefficient of phenotypic and genotypic variation was indicative to genetic variability for all of the studied traits. The broad-sense heritability ranged from 49.06% (plant height) to 92.48%% (number of filled grain per panicle) and was 59.46% for grain yield. The highest phenotypic and genotypic coefficients of variation and genetic gain over total average obtained for the number of grains per panicle. Thus, it is possible to improve this trait by selection method and could be used as a selection index to improve grain yield. Overall, genotype number 6 could be considered as a superior genotype to achieve a dwarf cultivar with stable yield.
Somayeh Dadashi, Reza Darvishzadeh, Mojtaba Nouraein, Hamid Hatami Maleki,
Volume 6, Issue 1 (9-2019)
Abstract
For the purpose of graphical analysis and estimation of genetic parameters related to yield and its components, six tobacco genotypes was crossed in half -diallel mating design. In this study, the F2 progenies and their parents were evaluated in a randomized complete block design with three replications. The results of analysis of variance indicated a significant difference between genotypes for plant height, leaf number, leaf dry weight and leaf fresh weight. Hayman graphical method was utilized for analysis of data. Diallel analysis indicated existence of an additive and dominant actions in inheritance of all studied traits. Traits including plant height, leaf number, leaf length and width, stem diameter, internode distance and leaf dry weight possessed greater additive effects meanwhile in the leaf weight the dominance effect was greater. The additive gene action detected for leaf dry weight (yield) manifested the influence of selection methods in breeding of this trait. Due to the fact that the fresh weight of the leaf was controlled by dominance effects, so hybrid-based methods are effective in modifying this trait. Also, additive and dominance gene action were contributed in heritability of yield, plant height and number of leaves. Regarding the mean values of dominance degree and results of graphical analysis, the gene action for leaf fresh weight was over-domnance and so, the heterosis phenomenon could be used to increase and improve this trait. For the traits including plant height, leaf number and yield, the gene action type was relative dominance.
|
|
|
|
|
|
|
|
|
