| 摘要 |
[Objectives] The paper was to explore the effects of low temperature stress on germination and physiological characteristics of different sweet maize varieties. [Methods] Taking Taitian 264, Zhexuetian 1 and Chaotian 4 as the research objects, the changes in germination potential, germination index, plant height, biomass, and antioxidant enzyme activity of maize seeds were studied under optimal temperature conditions (25 ℃) and low temperature stress conditions (10 ℃). [Results] Under 10 ℃ stress, the germination rate and germination index of Taitian 264 were higher than that of Zhexuetian 1 and Chaotian 4. Under low temperature stress, Taitian 264 exhibited the least reduction in height and biomass, while Zhexuetian 1 had the most reduction. Additionally, the SOD and POD activities of Taitian 264 were higher than that of Zhexuetian 1 and Chaotian 4 under both temperature conditions, while the MDA content of Taitian 264 was lower. Taitian 264 showed strong germination ability against low temperature stress. [Conclusions] This study provides a basis for timely sowing practices of sweet maize in agricultural production. |
