| چکیده انگلیسی مقاله |
Extended Abstract
Introduction and Objective:Extended Abstract
Introduction and Objective: Rapeseed is one of the most important oilseeds and the selection of high-yielding genotypes with desirable characteristics is especially important. Also, study on relationships between yield and other agronomic traits will improve the efficiency of a breeding program with appropriate selection criteria. Therfore, the aim of this study was to compare different rapeseed genotypes in terms of several traits and analyze the correlation between their different traits, as well as to select the best rapeseed genotypes based on the combination of agricultural traits with oil yield using biplot GT and GYT methods.
Material and Methods: In this regard, 15 new lines along with two cultivars were evaluated in a randomized complete block design with three replications in agriculture research station of Gonbad during 2019-2020. The phonological, morphological characteristics and yield components including days to flowering starting, days to physiological maturity, plant height, number of lateral branches, number of pods per plant, number of seeds per pod, thousand seed weight, oli content, and oil yield were measured. In this study, the methods of genotype × trait (GT) and genotype by yield × trait biplot (GYT) were used to identify interrelationships between different traits and selection of the best rapeseed genotypes.
Results: The results showed that using GYT biplot is more efficient than GT biplot. Based on the GYT biplot and GYT index, the genotypes G17, G11, and G4, are considered as superior genotypes in combination with agronomical traits i.e., days to flowering starting, days to physiological maturity, plant height, number of lateral branches, number of pods per plant, number of seeds per pod, thousand seed weight, oli content, and oil yield. Also, the results of vector view of the GT biplot showed that a high positive correlation was observed between OY×NLB, OY×NSP, OY×TSW, OY×PH, OY×OC, OY/DF and OY/DPM, which shows the usefulness of combining the number of lateral branches, number of seeds per pod, thousand seed weight, oil content, plant height and ripening time (number of days to flowering and ripening) with oil yield to increase the production of genotypes in rapeseed.
Conclusion: Generally, the results indicated that genotypes No. 17, 11 and 4 were recognized as superior genotypes from the point of oil yield and other agronomic traits. Also, the traits of number of lateral branches, number of seeds per pod, thousand seed weight, plant height and ripening time (number of days to flowering and ripening) could be used as suitable criterions in selecting for increased oil yield in rapeseed breeding programs.
Keywords: Biplot, Correlation. GYT index, Oil yield,Phonological characteristics |