Development of a supernodulating soybean [Glycine max] cultivar and studies on its physiological and agronomic properties
2007
Takahashi, M.(National Inst. of Crop Science, Tsukuba, Ibaraki (Japan))
Soybeans must accumulate large amounts of nitrogen (N) during reproductive growth due to the high protein content of their seeds. Supernodulating soybean lines, which produce several times more nodules than conventional genotypes, were initially expected to enhance soybean productivity and reserve more N for subsequent crops through their higher N-fixing ability. Existing supernodulating lines bearing over 5-10 times as many nodules as conventional lines have proven inferior, however, to conventional cultivars in growth and yield. We developed an actively growing, high-yielding supernodulating soybean cultivar, 'Sakukei 4' (previously 'En-b0-1-2', now 'Kanto 100'), by improving conventional supernodulating genotype 'En6500'. We confirmed the physiological properties of Sakukei 4, such as its high N-fixing ability through the growing season, its high leaf N content, and its high photosynthetic rate during seed filling. We also demonstrated that Sakukei 4 is highly adaptable to no-tillage and narrow-row cultivation in upland fields converted from paddies, producing a higher yield than in conventional cultivation.
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