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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (8): 2431-2442.doi: 10.16420/j.issn.0513-353x.2025-0499

• Cultivation · Physiology & Biochemistry • Previous Articles     Next Articles

Study on the Dynamic Changes of Antioxidant Enzymes in Tomato Roots,Leaves and Fruits Under Low Salt Stress

KANG Lei1, ZHU Yanzhe2, LIANG Min2, WU Longguo2,3,*()   

  1. 1 Ningxia Rural Science and Technology Development Center, Yinchuan 750021, China
    2 School of Wine & HorticultureNingxia University, Yinchuan 750021, China
    3 Ningxia Modern Protected Horticulture Engineering Technology Research Center, Yinchuan 750021, China
  • Received:2026-05-21 Revised:2026-07-21 Online:2026-08-25 Published:2026-08-25
  • Contact: WU Longguo

Abstract:

Using the‘Xiangfei 3’cherry tomato as the experimental material,four NaCl concentration gradients were set up:0(control),1,2,and 3 g · L-1,to investigate the effects of low salt stress on the growth of tomato plants and the antioxidant enzyme activity in their roots,leaves,and fruits. The results showed that compared to the control,treatment with 3 g · L-1 significantly reduced stem thickness,leaf width,chlorophyll content,fruit weight,fruit length and diameter,root length,root surface area,and both fresh and dry root biomass. At the same time,the transpiration rate and net photosynthetic rate of tomato leaves increased significantly,while the maximum photochemical efficiency and initial fluorescence decreased significantly. The results showed that compared to the control,treatment with 3 g · L-1 significantly reduced stem thickness,leaf width,chlorophyll content,fruit weight,fruit length and diameter,root length,root surface area,and both fresh and dry root biomass. At the same time,the transpiration rate and net photosynthetic rate of tomato leaves increased significantly,while the maximum photochemical efficiency and initial fluorescence decreased significantly. At different stages,the catalase(CAT)activity in tomato fruits was highest under the 2 g · L-1 treatment,peroxidase(POD)activity was highest under the 2 g · L-1 treatment,and superoxide dismutase(SOD)activity in the fruits of the 4th and 5th clusters was highest under the 2 g · L-1 treatment,all showing a significant increase compared to the control. The highest POD activity in tomato roots was seen with the 3 g · L-1 treatment,while SOD and CAT activities were highest with the 2 g · L-1 treatment,all significantly higher than the control. POD in the third cluster of tomato fruits was highly significantly correlated with POD in the fourth cluster,and CAT in the fourth cluster was highly significantly correlated with CAT in the fifth cluster.

Key words: tomato, low salt stress, antioxidant enzyme activity