Low R/FR Ratio Affects Pakchoi’s Growth and Nitrate Content under Excess Nitrate Stress

Nitrate accumulation is one of the main factors secondary soil salinization in protected horticulture China. Previous studies have shown that a low red(R)/far-red (FR) ratio can improve salt tolerance plants under NaCl stress. However, effect R/FR on plant growth nitrate stress not clear. In order to explore adaptability pakchoi high nitrogen stress, index, soluble protein content, sugar reductase activity and Nia2 gene expression pakchoi’s leaves were measured. The results showed level (the addition 80 mmol · L?1 NO3? (N80) 160 (N160)) inhibited promoted osmoregulation substances respectively. reduction (L80) increased fresh weight it by 19.0%, reduced content 22.7%, NR 29.9%, made more significant, compared with N80. There was similar mitigation excessive Therefore, effectively control Thus, there practical application prospect for production nitrogen.