Rice (Oryza sativa
) plants lose significant amounts of volatile NH3
from their leaves, but the precise mechanisms involved remain unclear. Kumagai et al. (pp. 1381–1386)
study photorespiration and conclude that it is strongly involved in NH3
emission by rice leaves. They suggest that differences in emissions between the cultivars studied result from differences in glutamine synthetase activities, which will result in different capacities for reassimilation of photorespiratory NH3
. The results also suggest that NH3
emission in rice leaves is not directly controlled by transpiration and stomatal conductance.