Acta Agriculturae Boreali-Sinica ›› 2024, Vol. 39 ›› Issue (S1): 108-116. doi: 10.7668/hbnxb.20194278

Special Issue: Potato crops Soil fertilizer Saline-alkali stress Cultivation & Physiology

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

Effect of Pretreatment with DPI and H2O2 on the Antioxidant System of Sweetpotato Seedlings in a Potassium Deficient Environment

GUO Pengyu1, ZHANG Qiangqiang2, JIN Rong2, ZHAO Peng2, WANG Jing2, ZHU Xiaoya2, YU Yongchao2, LIU Ming2, WU Dexiang1, TANG Zhonghou2   

  1. 1 School of Agronomy,Anhui Agricultural University,Hefei 230036,China
    2 Xuzhou Institute of Agricultural Sciences in Jiangsu Xuhuai District,Xuzhou 221131,China
  • Received:2024-03-21 Published:2025-01-24

Abstract:

In order to investigate the effects of reactive oxygen species(ROS)on the growth and antioxidant system of sweetpotato under potassium deficiency stress,and further reveal the defense mechanism of ROS regulation in sweetpotato under potassium deficiency stress.This study selected two sweetpotato varieties,Xushu32(low potassium tolerant)and Ningzi 1(low potassium sensitive),as experimental materials.The experiment was conducted in an artificial climate chamber using hydroponic cultivation to ensure consistent environmental conditions.After pretreatment with exogenous H2O2 and diphenyl chloroiodate(DPI),ROS inhibitor,the sweetpotato seedlings were subjected to potassium deficiency treatment.The changes in relative H2O2 content,antioxidant gene expression levels,and enzyme activity indicators in sweetpotato roots at different time points after potassium deficiency treatment were measured.The morphological characteristics of sweetpotato were recorded to explore the effects of ROS signaling on the growth of sweetpotato seedlings under potassium deficiency stress.The results showed that under potassium deficiency treatment,the biomass of sweetpotato decreased and leaf color lightened.The relative concentration of ROS in sweetpotato seedling roots showed the highest fluorescence intensity on the 14th day.The expression levels of antioxidant-related genes in sweetpotato roots generally increased,with a more significant increase in expression levels after H2O2 pretreatment.Compared with-K treatment,both H2O2 and DPI pretreatment could enhance the activity of antioxidant enzymes in sweetpotato leaves,and different enzyme activities showed different trends within 21 days of potassium deficiency treatment.There were varietal differences in the effects of different treatments.The experimental results showed that H2O2 could act as a stress signaling molecule to increase the expression level of antioxidant genes and the enzymatic activities of APX,SOD and POD in sweetpotato seedlings,thus scavenging excess ROS and effectively alleviating the inhibition of growth of sweetpotato seedlings by potassium deficiency stress.And DPI could inhibit the production of endogenous H2O2,maintain the antioxidant enzyme activity,protect the ROS enzymatic scavenging system of sweetpotato seedlings and avoid oxidative damage to tissues.

Key words: Sweetpotato, Potassium deficiency stress, H2O2, ROS, DPI

Cite this article

GUO Pengyu, ZHANG Qiangqiang, JIN Rong, ZHAO Peng, WANG Jing, ZHU Xiaoya, YU Yongchao, LIU Ming, WU Dexiang, TANG Zhonghou. Effect of Pretreatment with DPI and H2O2 on the Antioxidant System of Sweetpotato Seedlings in a Potassium Deficient Environment[J]. Acta Agriculturae Boreali-Sinica, 2024, 39(S1): 108-116. doi: 10.7668/hbnxb.20194278.

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