Estimation of genetic parameters for grain yield and its components in three bread wheat crosses under low input of nitrogen fertilizer [electronic resource].

Includes references.

Six populations (P₁, P₂, F₁, F₂, Bc₁ and BC₂) of three bread wheat(Triticum aestivum L.) crosses, mamely Gemmeiza 9 x Mayon"S"//Crow"S"/Vee"S" (cross I), Attila/Sids 1 x Sakha 94 (cross II) and Mayan "S"//Crow "S"/Vee"S" x Attila /Sids 1 (cross III) were used to estimate genetic parameters for grain yield/plant and certain related characters under two nitrogen fertilizer levels; (40 Kg N/Fed [low level] and 75 Kg N/Fed (recommended level]). Results revealed that heterosis values were positive and significant relative to better-parent in the three crosses under the two nitrogen levels for most of the studied characters. Meanwhile, heterosis values were negative and significant for number of kernels/spike in the first and the third crosses under low level of nitrogen N1, and the third cross under recommended level N2 and for kernel weight in the second cross under N1. In the second and third crosses under N2, positive and significant inbreeding depression values were recorded for all studied characters in the first cross except for kernels/spike under both N1 and N2, for kernels/spike in the second cross under both N1 and N2 for spikes/plant and grain yield in the third cross under N1 and N2, whereas negative significant values were obtained for kernels/spike in the third cross and for kernel weight in the second and third ones under both levels of nitrogen.

Summary in Arabic.

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