Salt-alkaline stress generally leads to soil compaction and fertility decline. It also restricts rice growth and nutrient acquisition, so reduces rice yield. However, little is known about the effect of salt-alkaline stress on the carbon and nitrogen metabolism of rice. In this study, two relatively salt-alkaline tolerant (Changbai 9 and Dongdao 12) and sensitive (Jinongda 138 and Tongyu 315) rice cultivars were grown in a field experiment conducted with two soil types including black soil and salt-alkaline soil to evaluate the characteristics of yield, carbon and nitrogen metabolism in rice. Results showed that yield and nitrogen use efficiency (NUE) in rice greatly decreased under salt-alkaline stress. Changbai 9 (CB9) and Dongdao 12 (DD12) showed higher NUE than Jinongda 138 (JND138) and Tongyu 315 (TY315) under the salt-alkaline stress. Additionally, carbon and nitrogen metabolism enzyme activity and compound content were significantly affected by salt-alkali stress; different performances were observed between cultivars under salt-alkaline stress. In conclusion, our results indicate that salt-alkaline tolerant rice cultivars may have more stable carbon and nitrogen metabolism than sensitive genotypes under salt-alkaline conditions.

盐碱胁迫通常会导致土壤板结和肥力下降。它还限制了水稻的生长和养分获取，从而降低了水稻产量。然而，盐碱胁迫对水稻碳氮代谢的影响知之甚少。在本研究中，以黑土和盐碱土两种土壤类型进行田间试验，种植两个相对耐盐碱（长白 9 和东稻 12）和敏感水稻品种（济农大 138 和通玉 315）水稻产量、碳氮代谢特征[J]. 结果表明，盐碱胁迫下水稻产量和氮素利用效率（NUE）显着降低。在盐碱胁迫下，长白9号（CB9）和东岛12号（DD12）的NUE高于济农达138（JND138）和通榆315号（TY315）。此外，碳氮代谢酶活性和化合物含量受盐碱胁迫显着影响；不同品种在盐碱胁迫下表现不同。总之，我们的结果表明，在盐碱条件下，耐盐碱水稻品种可能比敏感基因型具有更稳定的碳和氮代谢。