Statistics of regression and correlation as stability estimates of nineteen faba bean genotypes [electronic resource].

Includes references.

Nineteen faba bean genetic resources were evaluated in two dates (15 October and 15 November) at Nubaria Research Station in 2004/5, 2005/6 and 2006/7 seasons. Combined analysis was performed to test the difference among varieties. seasons. dates and their interactions in order to apply statistics of Eberhart and Russell, Tai`s as well as regression and correlation model. Results cleared highly significant environment (linear) mean squares indicating that environments differ in their effect on different genotypes. Highest yield/fed. was given by genotype 1557/992/2001 being 11.22 ard./fed.followed by genotypes 1378/1157/99, 1423/653/2000, 1617/817/2002, 943/1151/93, and 1557/930/ 2001 that produced 10.42, 10.22, 9.392, 9.386 and 9.313 ard./fed., respectively. Eberhart and Russell method, showed that genotypes 943/1151/93, 1426/711/2000, 1556/914/2001, 1233/848/99, 1557/992/2001,1423/653/2000,1378/1157/99, 1033/738/96, 1569/600/2002, 1617/817/2002 and 1557/930/2001 had phenotypic stability and stable performance in the environments. Tai`s, parameters дi and д i showed that genotypes Giza 3,943/1151/93, 1426/711/2000, 1033/738/96 and 1617/817/2002 exhibited above average stability (α < 0 And д = 1). Genotypes 1005/654195 and 1475/1162/2000 had a degree of below average stability (α > 0 and д =1). Estimates of simple regression and correlation model scored insignificant and low values of r and R² and high values of stability percentage (1-R² %) for genotypes Giza 3, 943/1151/93, 1426/711/2000, 1556/914/2001, 1557/992/2001, 1423/653/2000, 1033/738/96, 1569/600/2002, 1617/817/2002 and 1557/930/2001 indicating poor of response to changing environments recording a stability percentage of 90.6, 94.2, 89,0, 98.5, 88.3, 99,7, 91.3, 99.5, 89.6 and 99.6%, respectively. Generally, results cleared that regression and correlation model, Eberhart and Russell and Tai`s showed that 10, 11 and 8 genotypes out of nineteen revealed yield stability. Regression and correlation model were in agreement of stable genotypes with Eberhart and Russell and Tai`s for genotypes 943/1151/93, 1426/711/2000, 1557/992/2001, 1033/738/96, and 1617/817/2002, respectively. On the other hand, it differs with Eberhart and Russell for Giza 3 variety. Also, results differ with Tai`s method for 1556/914/2001, 1423/653/2000, 1569/600/2002 and 1557/930/2001 genotypes. Results indicated that regression and correlation model included all stable genotypes in the other two methods in addition to the simplicity of this model The result of Chi square test for evaluating the studied methods was not significant with P value of 0.612 indicating that the three methods are similar in their results.

Summary in Arabic.

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