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高温干旱对髯毛箬竹生理生态及保护酶活性的影响
李伟成,盛海燕,毕毓芳,温 星,田新立,等
作者单位E-mail
李伟成 国家林业局竹子研究开发中心/浙江省竹子高效加工重点实验室 lee_caf@163.com 
盛海燕 杭州环境保护科学研究院  
毕毓芳 国家林业局竹子研究开发中心/浙江省竹子高效加工重点实验室  
温 星 国家林业局竹子研究开发中心/浙江省竹子高效加工重点实验室  
田新立 国家林业局竹子研究开发中心/浙江省竹子高效加工重点实验室  
摘要:
全球变暖及其导致的高温干旱气候对物种生长及品质产生重大影响。本研究在模拟自然条件下,以髯毛箬竹为对象,研究髯毛箬竹生理生态反应过程及抗氧化酶系统与高温干旱的关系。研究发现,髯毛箬竹对不同高温干旱条件的响应大相径庭,高温明显拉升蒸腾速率,气孔导度也随之升高,极端高温条件下是非气孔限制因素导致光合速率下降,且收窄光合日进程的变化幅度;涉及干旱及其复合处理的条件,气孔限制因素导致光合速率降低;重度干旱及其复合处理严重影响植株生理进程,温度加剧这一进程,具体表现为蒸腾速率、光合速率、气孔导度和水分利用效率显著下降;细根水势下降比成熟叶片更强烈;细根和成熟叶片3种抗氧化酶活性对高温和干旱的响应一致;细根SOD活性大于成熟叶片,而CAT和POD活性则相反。因此,细根是髯毛箬竹适应高温干旱环境的重要器官,吸收器官比蒸腾器官敏感。髯毛箬竹具有较好的抗高温和抗旱能力,一定范围内的高温和干旱能刺激其生理生态适应状态和抗氧化酶活性的提升,特别是复合作用下,高温与干旱对其生长表现出协同作用,极端高温+中度干旱并不威胁其生存,高温、中度干旱及高温+中度干旱有利于驯化栽培,甚至一定程度上能促进其生长;重度干旱则使植株生理进程受损,温度的提升使这种损害更加严重,不适宜长期重度干旱的环境。
关键词:  极端气候  地被竹  气孔行为  水势  细根
DOI:
分类号:
基金项目:浙江省自然科学基金(LY14C030008);浙江省科技计划项目(2016F50008);浙江省省院合作项目(2015SY06)
Impact of drought, heat, and their combination on eco-physiological characteristics and antioxidase enzymes activity in dwarf bamboo (Indocalamus barbatus)
Li Weichenglee,Sheng Haiyan,et al
Abstract:
Global warming and its high temperature and drought climate have significant impacts on the growth and quality of dwarf bamboo. This paper aims to study the relationship among eco-physiological reaction and antioxidase enzyme system of Indocalamus barbatus, and high temperature and drought under simulating natural conditions. Results showed that the responses of I. barbatus were quite different under different high temperature and drought conditions. High temperature elevated transpiration rate significantly when stomatal conductance also increased. Under the condition of extreme high temperature, the non-stomatal-limiting factors led to the decrease of photosynthetic rate, which narrowed the amplitude variation of diurnal photosynthesis process. Under the condition of drought and its combined treatments, the stomatal-limiting factors led to the decrease of photosynthetic rate. Severe drought and its combined treatments seriously affected the physiological process, and temperature intensified it, because the transpiration rate, photosynthetic rate, stomatal conductance and water use efficiency decreased significantly. Water potential of fine root decreased more strongly than that of mature leaves. The responses of 3 antioxidant enzymes in fine roots and mature leaves were consistent with those of high temperature and drought. SOD activity of fine root was higher than that of mature leaves, while CAT and POD activities were the opposite. Therefore, absorbing organ was more sensitive than transpiration organ, and the fine root was an important organ of I. barbatus adapting to high temperature and drought environment. I. barbatus has good resistance to high temperature and drought. Within a certain range of high temperature and drought, it could stimulate the eco-physiological adaptation status and enhance the antioxidant enzyme activity, especially under its combined treatments, high temperature and drought had synergistic effects on growth. Extreme heat+moderate drought did not threaten its survival. High temperature, moderate drought and its combined treatment were favorable for domestication and cultivation. Severe drought damaged the physiological process of the plant, the temperature made the damages more serious. I. barbatus doesn’t fit forlong-term severe drought environment.
Key words:  Extreme climate  dwarf bamboo  stomata behavior  water potential  fine root