Inheritance of Some Traits Associated With Resistance to Sunn Pest (Eurygaster integriceps) by Generation Mean Analysis in Bread Wheat

To study of resistance to sunn pest (Eurygaster integriceps) in bread wheat، parents including Falat (Resistant) × sardari (Susceptible) were crossed and generations of F1، F2، BC1 and BC2 were obtained. The six basic generations (parent، first and second filial generations (F1، F2)، first and second backcrosses (BC1، BC2) of crossings were planted in a Randomized Complete Block design with three replications at the Research Farm of Islamic Azad University، Karaj، Iran. Analysis of weighted variance showed that differences between generations were significant for all traits، except for total seed weight in damaged spikes. Joint scaling test showed that both additive and dominance componenets were involved and at the most time epistasis was implicated. In spite of this the additive components were most important. In seed-damaged percentage، as the most important trait، m، d، h، I and l model was significant.