فتح الله نادعلی

Abstrac: Determining the amount of genetic diversity in the genotype will be a fundamental and important step in the correct selection of parents to continue breeding programs in the next generations. The purpose of this research was evaluating the new modified pepper lines in Iran and in the climatic conditions of Shahrood region, for determining the best line for farmers. The experiment was conducted in the research farm of Shahrood Agricultural Research and Training Center It was carried out in three replications in two crop years 2014 and 2015 in the form of randomized complete block design. The number of experimental plots was 36 and the dimensions of each experimental plot were 10x2 square meters with 3 rows. In this test, 12 varieties and lines of pepperwere compared. Based the analysis of variance results, it was found that there was a significant difference between the studied lines in terms of the higher yielding trait at the probability level of one percent, so that the highest amount of higher yielding (18506 kg/ha) was belonged to the line number 8-16 (Hamedan) and the lowest yield with values of 9684 kg/ha was observed in line 0013 of Taiwan. Among the studied lines, the highest amount of fresh weight of a single plant with an average of 2331 grams per hectare was observed in line number 6-24 of Gilan. the line No. 13-4 of Zaman Abad had the lowest amount of fruit with the production of 16667/96 fruits per plant. According to the results of this research, it can be seen that there is a significant difference between the examined lines in terms of yield, fresh and dry weight and number of fruits. Which can indicate the existence of high genotypic diversity between the different populations.