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In the present work the relationships between yield and its related traits   were investigated in tobacco genotypes under normal and abiotic stress   conditions (Orobanche aegyptiaca weed) at Urmia Tobacco Research Centre,   Iran, during 2006-2009 cropping seasons. The experimental design was a   randomized complete block design (RCBD) with three replications in each   condition every year. Analysis of variance revealed extent genetic   variability among the genotypes for most of the traits studied. In comparison   with normal condition, the mean value of studied traits decreased in stress   condition. LAI and FD showed the maximum and minimum diminution in the mean   values under stress condition compared to normal one so known as more   sensitive and more tolerant traits, respectively. Based on CV values, the   traits FD and DLYP showed the minimum and maximum variation among traits in   both normal and stress conditions. Correlation analysis revealed significant   and positive correlations between DLYP with all studied traits in both normal   and stress conditions. Path analysis detected the traits including biomass,   APDW and DWR as the first-order variables at normal condition and biomass,   APDW, DWR and harvest index as the first-order variables under abiotic stress   condition. Based on results, the traits such as biomass, APDW, DWR detected   as more important factors in both conditions can be used in tobacco breeding   programs for increasing yield. Abbreviation: aerial part fresh weight without   leaves weight (APFW), aerial part dry weight without leaves weight (APDW),   biomass (BIO), coefficient of variation (CV), dry weight of root (DWR),   flowering date (FD), fresh weight of leaf (FWL), fresh weight of root (FWR),   harvest index (HI), leaf area index (LAI), dry leaf yield per plant (DLYP),   number of leaf (NL), plant height (PH), randomized complete block design   (RCBD), standard deviation (Std)

genetika

Sequential path analysis for determining interrelationships between yield and related traits in tobacco (Nicotiana tabacum L.) under normal and abiotic stress conditions