تجزیه همبستگی صفات مرتبط با مقاومت به بیماری فوزاریوم سنبله در گندم نان

Fusarium pathogen infect wheat globally and cause a devastating disease namely Fusarium head blight (FHB) which have a significant impact not only on global wheat production, but also on food safety because of grain contamination during infection with trichothecene mycotoxins. The resistant varieties production via plant breeding is the most effective way to fight this disease. The aim of this study was to determine the correlation between characters related to resistance to disease including, Percentage of diseases incidence, disease Severity, fusarium damaged kernels and stress susceptibility index, in order to use these relationships in the eugenic of resistant cultivars in bread wheat, different cultivars of bread wheat (including 21 cultivars) including wheat suitable for dry land and wheat in the northern region of Iran, as well as some highly tolerant and highly sensitive standard cultivars, were randomly selected in a randomized complete block design with three replications in the year 2017 in the educational field of the University of Science Agriculture and natural resources of Gorgan were cultivated.Fusarium graminearum spore suspension was used to create artificial contamination in the field. After data extraction, the correlation coefficients between the resistance indexes were calculated. The results of correlation coefficient calculations showed that all the indices of the studied disease had a positive and significant correlation between resistance indices at the probability level of one percent, with the highest positive number of 0.9576 between the disease severity and the disease index , Which means that the trend of these two parameters is more serious than other indicators related to resistance to Fusarium spike.In fact, the positive correlation coefficient means that in an area where the study has been done, an increase in a parameter with the increase of the other parameter and the reduction of that parameter is associated with a decrease in the other parameter, and the number of 0.9576% indicates that 95% Changes in the disease index are justified by the severity of the disease, and 1-95% is controlled by other factors. The lowest correlation coefficient was related to the fusarium damaged kernels and the Percentage of diseases incidence with a positive number of 0.3995. By using such results, it can be more reliable than screening of wheat germplasm to achieve resistance to Fusarium wheat spike.