ارزیابی ارتبات بین صفات زراعی جو با شدت نهایی بیماری قارچی لکه قهوه ای جو در ژنوتیپ های جدبد جو دیم در منطقه گنبد کاووس

In order to study of relation between agronomic traits of 18 barley genotypes and content of brown spots in Gonbad-e-Kavous ,located in north east of Golestan province, experiments arried out in form of randomized completely block design in 4 repetitions in 2014-2015 crop year.
Contamination in the farm created by cultivation of sensitive cultivars. Result criteria for evaluation of disease included final disease severity. The agronomic traits which measured were days to heading (DAM), height of plant, thousand grain weight (TGW) and yield. The obtained results of variance analysis, related to agronomic traits, showed all traits but yield trait in statistics probability level, had a significant difference (1%) among 18 genotypes in this study. Average comparison between agronomic traits data showed the maximum and minimum of days to heading were in genotype 3 with 50/111 days and genotypes 1 and 5 with 104 days respectively. The maximum and minimum days to physiologic maturity observed in genotype7 with20/14 and genotype 1 with 75/136days respectively. Maximum thousand grain weight in genotype 5 with 29/4 and minimum weight in genotype 3 with 94/31 observed. The most and least of weight of plant observed in genotype 5 with 76 Cm and genotype....... with .... Cm respectively. Also to attention to significant yield index, average comparison carried out. Nevertheless maximum and minimum yield was related to genotypes 5 and 3 respectively.
The obtained results of variance a analysts of final severity index of disease showed this trait among 18 genotypes had not significant difference in the last measurement. The obtained results from determination of Pearson Correlation Coefficient between agronomic traits and phytopathological trait, final disease severity in 18 genotypes of this study showed Pearson Correlation Coefficient was negative between yield, plant height, with phytopathological trait,final disease severity and in statical probability in the level of 5% was significant. To the other word, to increasing of final disease severity, yield and plant weight decreased and vice versa. Eventually investigation showed yield parameter had negative correlation and significant relationship to phytopathological trait of brown spots. To the other word genotype yield was influenced of content of disease. Also negative correlation and significant relationship was among related parameters to disease(FDS) and plant height.