Correlation and path analysis of white sugar yield with some of traits under irrigated regimes in sugar beet (Beta vulgaris L.) genotypes
Subject Areas : Journal of Plant Ecophysiology
1 - کارشناس ارشد و محقق مرکز تحقیقات کشاورزی و منابع طبیعی فارس
Keywords: Sugar beet, Correlation, irrigated regims, path analysis, white sugar yield,
Abstract :
Understanding the relationship between white sugar yield and other traits in sugar beet may be a crucial step towards successful breeding of this important crop. Path analysis provides a useful method in analzing coefficients of correlations and this method is able to effectively unveil direct and indirect effects among traits of interest. This study was conducted to characterize white sugar yield and its related plant traits. Correlation and path analysis were carried out in sugar beet genotypes grown under irrigated regimes. Therefore, an experiment was conducted in 2002 using a split-plot design in randomized complete block with three replications at the Research Farm of Agricultural Research Center in Zarghan, Fars, Iran. The main plots consisted of three irrigated regimes: non stress, mild stress (75% irrigated) and severe stress (50% irrigated), and the ten genotypes as the sub plots. Data were analyzed using mini-tab, SAS and Excel soft ware. The analysis of variance revealed highly significant differences among the genotypes for all characters studied in this experiment. Results indicated that in both mild and non stress conditions, sodium, sugar content, purity and canopy temperature and thereby osmotic and turger potential had high correlations with white sugar yield, while in severe stress condition, none of these traits was correlated with white sugar yield. In none stress condition, sodium, sugar content, purity and canopy temperature showed a considerable direct effect on white sugar yield. In mild stress condition, in addition to these traits, osmotic and turger potential showed to have high direct effects. In severe stress condition, except for α-amino-N and canopy temperature traits, other traits had considerable direct effects.