Development of wheats with enhanced nutrient efficiency: progress and potential
1988
Graham, R.D. (Waite Agricultural Research Inst., Glen Osmond (Australia). Dept. of Agronomy)
Nutrient efficiency is defined as the ability of a genotype to grow in a soil too deficient in that nutrient for a standard genotype. Considerable genetic diversity for Cu, Zn, and Mn efficiency exists within wheat and breeding for these traits and their combination in a single genotype appears possible. High efficiency exists in rye and it appears possible to transfer these characters from rye to wheat via chromosome translocation. Triticale inherits nutrient efficiency from its rye parentage. Progress for greater P efficiency is hampered by lack of knowledge of what is involved biochemically and by lack of effective screening procedures. It is argued that wheat is already as N-efficient as is necessary. Nutrient efficiency may confer greater disease and drought resistance/tolerance, deeper rooting, and greater responsiveness to the use of other fertilizers, especially N
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