Carbon isotope ratios of respired CO₂ from castor bean, corn, peanut, pea, radish, squash, sunflower and wheat seedlings

During the first month after germination peanut and sunflower seedlings exhibit a significant shift in the 13C/12C ratios of respired CO2 indicating thatcarbohydrate gives way to lipid as the respiratory substrate. Other species (castor bean, corn,pea, radish, squash and wheat) show no change in the 13C/12C ratio