Changing seasons or environmental condition of a region and various life phases of the yearly cycle of plants can cause the production of reactive oxygen species in plant tissues. The antioxidative system plays a vital role in acclimations in such stress-full conditions, either enzymes or non-enzymatic molecules. Hippophae salicifolia D. Don. is a dioecious and deciduous tree species growing in temperate to the subalpine region of Indian Himalayas in Lahul Spiti (Himachal Pradesh), Uttarakhand, Sikkim, and Arunachal Pradesh. As a dioecious species, variation in male and female was observed in many aspects in both sexual-morph in a range of studies. A hypothesis was made in this study, that male and female plant of H. salicifolia has a different antioxidant potential for quenching the reactive oxygen species in the various growing season of the year, and the antioxidant enzyme activities of male and female also vary with pheno-phases. For this purpose, 10-year-old male and female plants were selected, and leaves and buds were collected from them according to the growing season. Enzymatic extraction was carried out according to the standardized method and enzyme assays were carried out for superoxide dismutase (SOD) and peroxidase (POD). Results showed the variation in SOD and POD enzyme activities in leaves and buds of male and female plants of H. salicifolia in different pheno-phases. Female leaves showed highest enzymatic antioxidant activities in the fruit maturation period (September) and lowest during leaf senescence period (November), whereas male leaves showed highest SOD activity in September but highest POD activity in July. Buds showed higher SOD activity, but lower POD activity than the leaves and differences in activity was not significant in dormant buds at gender basis, active buds showed lower SOD activity but higher POD activity in both male and female.

一个地区的季节或环境条件的变化以及植物年周期的各个生命阶段都会导致植物组织中活性氧的产生。在这种充满压力的条件下，无论是酶还是非酶分子，抗氧化系统都起着至关重要的作用。沙棘salicifolia D.唐。是生长在温带至印度喜马拉雅山亚高山地区的雌雄异体的落叶树种，分布在拉胡斯·斯皮提（Himachal Pradesh），北阿坎德邦，锡金和阿鲁纳恰尔邦。作为一种雌雄异体的物种，在一系列研究中在许多方面都观察到雄性和雌性的变异。在这项研究中提出了一个假设，即唾液螺旋藻的雄性和雌性植物在一年中的不同生长季节，具有不同的抗氧化剂潜力来淬灭活性氧，并且男性和女性的抗氧化酶活性也随表相而变化。为此，选择了10岁的雄性和雌性植物，并根据生长季节从中收集叶子和芽。根据标准化方法进行酶提取，并对超氧化物歧化酶（SOD）和过氧化物酶（POD）进行酶测定。结果表明，水杨实生雌雄叶片的SOD和POD酶活性均发生了变化。在不同的表位相 雌叶在果实成熟期（9月）表现出最高的酶促抗氧化活性，而在叶片衰老期（11月）表现出最低的酶促抗氧化活性，而雄叶在9月表现出最高的SOD活性，而在7月表现出最高的POD活性。芽表现出高于叶片的SOD活性，但POD活性比叶片低，并且休眠状态的芽在性别方面的活性差异不显着，活性芽在雄性和雌性中均表现出较低的SOD活性，但POD活性较高。