精氨酸对低温冷害下水稻幼苗形态特征及生理特性的影响

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中图分类号：S511 文献标识号：A 文章编号：1001-4942（2025）08-0066-09

Abstract This experiment used Oryza sativa ‘ Xiangzaoxian 45⋅ as test material and conducted under the artificially simulated low-temperature （ 4% ） environment. With spraying distilled water followed by normal-temperature （ 25°C ） treatment （CK1） and low-temperature（4 C ） treatment （CK2） as control groups， spraying arginine solutions at different concentrations of 0.O25，0.25，2.5 and 25 mmol/L（labeled as T1， T2，T3 and T4，respectively）were set to study their effects onthe morphological and physiological characteristics of rice seedlings under low-temperature stress at12，24 and 36 hours.The results demonstrated that lowtemperature stressignificantly inhibited plant height，aboveground fresh weight and chlorophyllbiosynthesis in leaves.However，appropriate arginine concentrations efectively aleviated these inhibitions.After 12 hours low-temperature treatment， T2 （O.25 mmol/L arginine） significantly increased plant height by 6.73% compared to CK2，and also increased the total root length，root surface area，root tip number and root branching number by 2.84% ， 10.06% ， 3.30% and 4.20% ， respectively. After 24 hours low-temperature stress ， T2 significantly enhanced plant height and stem diameter by 15.85% and 6.73% ，respectively. After 36 hours of lowtemperature treatment， T2 increased the aboveground fresh weight by 10.16% compared with CK2. After 12 hours and 24 hours low-temperature exposure，T2 significantly increased the chlorophyllb and total chlorophyll levels by 59.13% ， 31.74% and 94.43% ， 29.95% ，respectively， compared to CK2. Arginine application enhanced the peroxidase （POD）and catalase（CAT）activities in both leaves and roots under low-temperature stress.After 24 hours treatment，the activities of SOD and POD in leaves treated with T2 were significantly higher than those of CK2，with the increase rates as 29.69% and 30.53% ， respectively. In sum， spraying 0.25 mmol/Larginine efectively alleviated the adverse effcts of low-temperature stress on rice seedling morphological development and physiological activity，thus enhanced the cold resistance during seedling stage.

KeywordsRice seedling； Arginine； Low-temperature stress； Morphological characteristics; Physiologi-cal characteristics

水稻是全球三大主要粮食作物之一，我国60% 以上的人口以稻米为主食[1]。（剩余9904字）