Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (1): 103-111. doi: 10.7668/hbnxb.20192429

Special Issue: Potato crops Cultivation & Physiology

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Exogenous Melatonin on Antioxidant System of Potato Seedlings under Low Temperature Stress

HE Qiulan1,2, ZHANG Hang1,2, WANG Zhengwei1,2, WAN Liqiang1,2, HAI Meirong1,2   

  1. 1. College of Agronomy and Biotechnology,Yunnan Agricultural University,Kunming 650201,China
    2. National-Local Joint Engineering Research Center on Germplasm Innovation & Utilization of Chinese Medicinal Materials in Southwestern China,Kunming 650201,China
  • Received:2021-07-09 Published:2022-02-28

Abstract:

In order to explore the effects of different concentrations of exogenous melatonin on the growth of potato seedlings under low temperature stress after cold acclimation,using Yunnan main potato variety Hezuo 88 as material,the effects of different concentrations of exogenous melatonin(50,100,150 μmol/L)on the growth and active oxygen metabolism system of potato seedlings under low temperature stress(4 ℃ 14 d ,-2 ℃ 12 h)were studied.The purpose of this study was to explore the feasibility of exogenous MT in alleviating the injury of potato seedlings caused by low temperature stress.The results showed that compared with potato seedlings under low temperature stress,the survival rate of seedlings treated with 50 μmol/L MT increased by 38.89 percentage point,and the plant height and stem diameter increased by 2.92% and 1.86%,the contents of SS,SP and Pro increased by 12.66%,13.80% and 1.96%,the activities of POD and CAT increased by 29.24% and 351.62%.The plant height and stem diameter of seedlings treated with 100 μmol/L MT increased by 16.97% and 2.82%,the contents of MDA and H2O2 decreased by 19.35% and 0.48%,the activities of POD and CAT increased by 55.44% and 213.56%.The survival rate of seedlings treated with 150 μmol/L MT increased by 27.78 percentage point,the plant height and stem diameter increased by 5.62% and 13.20%,the content of MDA decreased by 9.45%,the content of Pro increased by 38.70%,SOD,POD and CAT activity increased by 52.61%,25.25% and 300.94%,and the content of AsA and GSH increased by 3.48% and 3.97%.The results showed that exogenous MT could promote the growth of potato seedlings,reduce the content of MDA and H2O2 in leaves,promote the accumulation of SS,SP and Pro,increase the activities of SOD,POD and CAT,and increase the content of AsA and GSH.Thus,it can alleviate the damage of low temperature stress to potato seedlings,and then improve the ability of potato seedlings to resist low temperature stress.In summary,50 μmol/L MT treatment could better improve the stress resistance of potato seedlings under low temperature stress.

Key words: Potato, Low temperature stress, Exogenous melatonin, Antioxidant system

Cite this article

HE Qiulan, ZHANG Hang, WANG Zhengwei, WAN Liqiang, HAI Meirong. Effects of Exogenous Melatonin on Antioxidant System of Potato Seedlings under Low Temperature Stress[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(1): 103-111. doi: 10.7668/hbnxb.20192429.

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