Current Proceedings on Technology

Yazarlar: Robab Davar, Reza Darvishzadeh, Sodabeh Jahanbakhsh-Godehkahriz

Konular:-

Anahtar Kelimeler:Basal stem rot,Helianthus annuus L.,Partial resistance,Sclerotinia sclerotiorum,SAS software

Özet: Sunflower, Helianthus annuus L. is a major oil­seed crop widely cultivated throughout the globe. Basal stem rot, caused by Sclerotinia sclerotiorum (Lib.) de Bary, is an important cause of yield loss in sunflower (Helianthus annuus L.). The experiment was conducted using recombinant inbred lines (RILs) coming from the cross between "PAC2" and "RHA266". Parents and 116 recombinant inbred lines (RILs) were arranged in completely randomized design with six replications and inoculated with an aggressive isolate of S. sclerotiorum in controlled conditions. Normality of the disease severity data was assessed according to the Shapiro and Wilk test (SAS PROC UNIVARIATE). Analysis of variance (ANOVA) of the disease severity data were performed using the general linear model (GLM) procedure in the SAS software (SAS Institute Inc.). High genetic variability and transgressive segregation were observed among recombinant inbreed lines (RILs) for partial resistance to S. sclerotiorum. Frequency distribution of RILs population and their parents for studied trait showed continuous patterns, confirming that the resistance is controlled by a polygenic system. The information presented here could assist sunflower breeders to choose resistance genotypes to S. sclerotiorum basal stem disease.

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