Somewhat inconsistent results are perhaps not surprising,
because grain filling in cereals is a complex process, depending on
environmental and genetic factors. In most cases, environmental
factors override the genetic factors in terms of C and N transport
into the grain. In contrast to legumes, cereals have a greater capacity
to store carbohydrates temporarily in their stem and leaf sheaths
and then remobilise them for grain filling (Fischer, 2011; Yang and
Zhang, 2006). Reserves produced pre-anthesis may contribute up
to 40% of total final grain weight, and their remobilisation is critical
for grain yield, especially if plants are under water stress (Yang and
Zhang, 2006). Importantly, remobilisation of assimilates for grain