3 Results 3.1 Effect of low-N stress on morphological indicatorsand total nitrogen content in oat There were highly significant differences ( P < 0.05 ) in agronomic traits and plant nitrogen content of oat varieties under low nitrogen stress treatment conditions.
The results showed that the physiological indexes of oats under low-nitrogen conditions were significantly different from those under normal culture conditions, and the total root length, total nitrogen, photosynthesis index, and NR enzyme activity of leaves in the five oat germplasm showed a decreasing trend, while the proline, MDA, SOD, POD, and GS enzyme activities showed an increasing trend, but the magnitude of changes in the physiological indexes varied among different varieties.