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Selection of soybean (Glycine max) lines for increased tolerance of N2 fixation to drying soil


, : Selection of soybean (Glycine max) lines for increased tolerance of N2 fixation to drying soil. Agronomie 21(6/7): 653-657

Our research offers strong evidence that N2 fixation activity of soybean can be sustained under soil-drying conditions. The genetic resources to exploit this possibility were obtained by developing a unique screening approach to search for a germplasm source for a complex, physiological trait. From our physiological studies, we identified petiole ureide concentration as a trait associated with N2 fixation tolerance, although the relationship was weak. Nevertheless, this specific trait was used as the initial, broad screen. Those lines identified in the initial stage were screened further in two screens of increasing intensity and greater focus on the N2 fixation process. We have now successfully identified eight plant introductions that have demonstrated tolerance in N2 fixation. We are now using these eight plant introductions to study in detail the physiology of the tolerance trait and to extend our efforts to breed commercial lines for increased yields under rainfed conditions.

US$19.90

DOI: 10.1051/agro:2001157


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