Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (9): 60-69.DOI: 10.11686/cyxb2023414

Previous Articles     Next Articles

Effects of nitric oxide on stress resistance and feed quality of Suaeda salsa under saline-alkali stress

Xiang-qi BU(), Shan-shan LI, Ying-na DUAN, Ying-chun WANG, Lin-lin ZHENG()   

  1. State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock,Key Laboratory of Herbage & Endemic Crop Biotechnology in Inner Mongolia,School of Life Science,Inner Mongolia University,Hohhot 010010,China
  • Received:2023-10-31 Revised:2024-01-15 Online:2024-09-20 Published:2024-06-20
  • Contact: Lin-lin ZHENG

Abstract:

To investigate the effect of nitric oxide (NO) on the growth and feed quality of Suaeda salsa seedlings under salt-alkali stress and its mechanism, S. salsa was used as the material for pot experiment in this study, salt and alkali stress were simulated with 300 mmol·L-1 NaCl, NaHCO3 and Na2CO3 (1∶1) solutions, respectively. Sodium nitroprusside (SNP) and PTIO (carboxy-PTIO) were used as the donors and scavengers, the effects of NO on plant growth indexes, antioxidant capacity, photosynthetic characteristics, ion content and feed quality under salt and alkali stresses were analyzed. The results showed: 1) Saline-alkali stress significantly compromised the growth status of the S. salsa seedlings, decreased biomass accumulation, photosynthetic efficiency and K+ content, while increased the content of reactive oxygen species, the activities of antioxidant enzymes, the content of Na+ and the Na+/K+. In addition, saline-alkali stress treatments resulted in a decline of feeding quality of S. salsa, resulted in the decrease of the crude protein, ether extract and dry matter contents, with increase of the cellulose content. 2) Application of NO significantly improved the salt-alkali stress tolerance of S. salsa. Specifically, NO enhanced antioxidant activity in the seedlings, and reduced the oxidative damage caused by salt and alkali stress. By increasing photosynthetic pigment content, stomatal conductance, transpiration rate and net photosynthetic rate, the photosynthetic inhibition caused by saline-alkali stress could be alleviated. By increasing the content of K+, reducing the excess accumulation of Na+ and Na+/K+, the ion balance under saline-alkali stress was reconstructed. 3) Application of NO improved the feed quality of S. salsa; crude protein, ether extract and dry matter content were increased by up to 46.0%, while the contents of fiber substances decreased significantly, by up to 32.0%. This study provided theoretical basis and research basis for the subsequent use of saline-alkali soil improvement and livestock feeding.

Key words: NO, Suaeda salsa, saline alkali stress, stress resistance, feed quality