Estimate the genetic and environmental variation and the coefficient of genetic and phenotypic variation and heritability in Safflower.

Abstract

In order to detect the influence of harvest date of Safflower (Carthamus tinctoriusL.) on values of genetic parameter ,and determine the trait less affected by the environment that have high heritability in order to develop a successful ,easily and short selection program to improve the traits of safflower . An experiment was carried out in the field of Field Crop Sci .Dep .College of Agriculture –Univ of Baghdad during 2010-2011 , five safflower cultivars were used (2081,Gelser ,Al-Mays,Ourdni,Rabie500) in randomize complete block design using spilt plot with three replicates .There were four harvest date : at physiology stage ,after 10 days,20 days ,and 30 days from physiological stage . The data showed that the value of parameters were different between tow years and among four dates of harvest . There was a decline in genetic parameters value when changing the date of harvest . For the four harvest date ,the highest percentage of heritability was the dry matter weight ,plant yield and total yield as the result of higher genetic variance contribution in the phenotypic variance which amounted to 99%,99% and 99% for the first date and 97%,99%and 99%for the second and 99%,99% and 99% for third date and finally 99%.99% and 91% for the fourth date respectively., But in the second year it has reached the same traits 99% ,93% and 96% for first date,99%,99% and 97% for second date ,99%,96% and 96% for third date ,and 99% .94%,98% for fourth date .The values of the genetic variation coefficient was very close to the values of the phenotypic variation coefficient for most of the traits studied . It can be concluded from these data the possibility of using these traits in successful selection program to improve the cultivar and for the four dates.