Impact of Salinity Stress on Morphological, Physiological and Biochemical Parameters at the Tillering Stage of the Sugarcane Cultivar Suphan Buri 7

Dong-Phuong Tra, Nguyen Nhan, Trinh Phuong, Minh Hoang, Bui Le, Thanh Chu and Nguyen Tran

Background and Objective: Sugarcane is a vital crop in Vietnam that supports sugar and food production. Saline intrusion from climate change is a major risk to Vietnam’s sugarcane farming. This study examined the effects of salinity stress on the sugarcane cultivar Suphan Buri 7 during the tillering stage. Materials and Methods: Sugarcane plants at the tillering stage were cultivated in salty soil for 14 days before the assessment of morphological, growth and biochemical parameters. Experimental data were analyzed using one-way ANOVA (p<0.05) with Duncan’s test in SPSS v 27.0.1, while Pearson correlation and PCA were performed in R v 4.2.1. Results: Salinity stress significantly affected sugarcane’s morphology, physiology and biochemistry. Shoot and root growth declined under salt stress, with 300 mM NaCl reducing their lengths by 11.867 and 7.00 cm, respectively. Photosynthetic pigments and protein content decreased, while proline levels increased, especially at 300 mM NaCl. The K⁺/Na⁺ ratio was lowest under severe stress, indicating ionic imbalance. Conclusion: The findings present an early description of how salinity stress impacts the tillering stage of the sugarcane cultivar Suphan Buri 7 in Vietnam’s sugarcane farming. In the tillering stage, this sugarcane variety can tolerate salinity in the range of 50-100 mM for 2 weeks.

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