تأثیر گزینش بر عملکرد و کیفیت الیاف پنبه رقم ورامین

In order to evaluate of annual selection effects on quality and quantitative traits as well as traits relations among cotton lines of Varamin cultivar. present study was performed during 2008-2011 at central station of research center of Varamin. Elite lines were selected annually from breeding lines population in view of morphological traits at the farm and then final selection was done based on fiber length and fiber percent as two important traits. The results showed that selection based on both traits together and selection based on fiber length, finally caused to get the same result in term of fiber percent in the next generation while in term of fiber length, the two kind of selections were different, so that in case of simultaneous selection for both traits, the fiber length was decreased in the next generation. Although the correlation between fiber percent and fiber length in the first year was not statistically significant but it was positive, while in the second and third years it was negative and significant. Therefore the character priority in selection could change the kind of this relationship.