1. A durum wheat plant having a partially or fully multiplied genome, which is at least as fertile as a tetraploid durum wheat plant (Triticum durum), isogenic to said durum wheat plant, when grown under the same conditions and located on that the very stage of development. 2. A hybrid plant, having as a source ancestor a plant according to paragraph 1.3. A hybrid plant of durum wheat with a partially or fully multiplied genome. 4. A plant according to claim 1, which is not transgenic. 5. A plant according to claim 1, having: (i) the number of ears of wheat at least the same as the number of ears of said plant tetraploid durum wheat (Triticum durum) at the same stage of development and under the same growth conditions; (ii ) the spike width is at least the same as the spike width of the indicated plant tetraploid durum wheat (Triticum durum) at the same stage of development and under the same growth conditions; (iii) the number of secondary spikelets, at least such same as the number of secondary spikelets in the specified tetra plant durum wheat plitoid (Triticum durum) at the same developmental stage and under the same growth conditions; (iv) an ear length of at least the same as the ear length of said tetraploid durum wheat plant (Triticum durum) on the same the same developmental stage and under the same growth conditions; (v) the grain mass is at least the same as the grain mass of the indicated tetraploid durum wheat plant (Triticum durum) at the same developmental stage and under the same growth conditions ; (vi) a grain yield per area at least the same as the yield th grain in races
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