بررسي تاثير باكترهاي آزوسپيريلوم وازتوباكتر همراه با مصرف ريز مغذي ها به صورت محلو ل پاشي و كاربرد درخاك برخصوصيات كمي وكيفي 5 رقم گندم بعد از كشت ذرت در استان فارس

Identification of Resistant Genotypes to Drought in Sunflower (Helianthus annuus) Based on Resistance Indexes, Threedimensional and Biplot Charts

Since a vast section of Iran is located in arid and semiarid region, identification of resistant genotypes to drought, is of paramount importance in reducing the damages that this restriction factor can bring about. So in order to find out the resistance of different genotypes. we need tools, such as resistance indexes, Biplotand Three-dimensional Chartsthat can help us in this regard. In thisresearch program which wascarriedout in Miandoab Agricultural Research Station, theeffects of drought stress on 8 sunflower genotypes were investigated. Thestress was exerted on the plants in two different: stages of flowering andseed formation. ASplitPlotexperiment WIlS conducted in a randomized complete block design. Main plots included 3 levels of irrigation: l-ncnnal irrigation. z-stoping irrigation cut at flowering, and 3-stopping irrigation cut at seed formation slage. Eight different genotypes were allocated to sub-plots. In order to evaluate eitherresistance or tolerance to drought, six indexes were assessed, that consisted of: Stress-Susceptibility Index(SSI), MeanProductivity( MP), Geometric-Mean Productivity (GMP), Tolerance(TOL), Stress-Tolerance Index(STl), and Drought-Response Index (URI),ln order to identify better indexes they were concluded onthe basis of Biplot and Three-dimensional charts, andalso their correlation with seed yield. The better index(es) for stress at flowering stage was MPand for stress on seed formation were GMP, SIl andMP. Finally using the obtained information of Three-dimensional charts, the better indexes lead to theselection of Golshid and TPK25630 cultivars for stress resistance at both flowering andseed formating stages.