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Soybeans cover a vast geographical region of 53°N to 40°S latitudes, but individual genotypes have a very narrow latitudinal adaptation of ~200 km due to photoperiodic limitations. Fourteen soybean maturity groups (MG0000‐X) of Northern America have genotypes adapted to very long (MG0000) to short (X) day length conditions. Photoperiod not only affects flowering but other agronomic traits also. Several...
Soybean, a short‐day plant, has its origin in higher latitudes of China, and its commercial cultivation remained confined to areas >22°N till 1970s due to precocious flowering accompanied with reduced biomass in lower latitudes. This review summarizes the effect of short days on soybean phenology, discovery of a novel long juvenile (LJ) trait, its role in breaking the latitudinal boundary for soybean...
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