N Metabolism Related to Plant Growth and Development
The morphology, especially the root structure, has been of hot concern in uptake and utilization of N by plants under water deficiency.
Root system plays an important role in the uptake of water and nutrients, synthesis of plant hormones, and the storage of photosynthetic assimilates. Root length,depth, thickness, density, weight, root to shoot ratio, penetration, osmotic adjustment are all good indicators used for related researches (Luo and Zhang, 2001).