Abstract:
Taking C2 and C5 tomato germplasm with different resistance as test materials, three saline-alkali treatments with different stress levels were set up by pot culture.The effects of different saline-alkali levels on the growth, ion balance and ROS scavenging capacity of two tomato varieties and their relationship with resistance were studied, in order to clarify their salt-alkali tolerance mechanism and provide reference for further comprehensive analysis of salt-alkali tolerance mechanism and salt-alkali tolerance breeding of tomato.The results showed that saline-alkali stress inhibited the growth of tomato phenotype, and in terms of physiological response, saline-alkali stress perocidated membrane lipids by increasing H
2O
2 content, superoxide anion production rate and malondialdehyde content, and tomatoes maintained normal physiological activities of plants by increasing antioxidant enzyme activity to clear ROS to adapt to the stress environment.Saline-alkali stress inhibited the absorption of K
+,Ca
2+,Mg
2+,reduced K
+/Na
+,Ca
2+/Na
+,Mg
2+/Na
+,affected cell membrane integrity and protein synthesis by forcing tomatoes to absorb Na
+.C5 remove ROS in time to adapt to stress environment by increasing antioxidant enzyme activity by higher magnitude, increase the absorption of Ca
2+,K
+,Mg
2+ ions in the aboveground part, and reduced the ion toxicity caused by excessive absorption of Na
+ ions to adapt to the environment.The above results showed that C5 cultivar exhibits more saline resistance than C2 by enhancing antioxidant enzyme activity and strong K
+/Na
+,Ca
2+/Na
+,Mg
2+/Na
+ to alleviate osmotic stress and reactive oxygen species damage caused by saline stress.