朱玉;黄磊;郑云普;郝立华;姜国斌;王贺新;李根柱;张自川;弓晓杰;

• 1:大连大学生命科学与技术学院
• 2:大连民族大学环境与资源学院
• 3:河北工程大学水电学院
• 4:大连大学现代农业研究院

摘要(Abstract)：

【目的】探讨不同程度的高温对高丛越橘叶片气孔特征及其气体交换参数的影响。【方法】以6个高丛越橘(Vaccinium corymbosum L.)品种的2 a生幼苗为试验材料(南高丛品种‘奥尼尔’‘海岸’和‘蓝脊’;北高丛品种‘公爵’‘布里吉他’和‘蓝丰’),利用人工气候箱控制生长温度的条件下,共设置4个温度处理,即对照(25℃)、轻度增温(30℃)、中度增温(35℃)和重度增温(40℃),利用印迹取样法及空间分析技术研究了6个越橘品种叶片气孔的结构特征和空间分布格局。利用Li-6400便携式光合测定系统测定了叶片的气体交换参数。【结果】研究发现叶片的气孔密度、气孔结构及其空间分布格局对增温产生的响应在南高丛和北高丛越橘2个类群之间没有明显的特异性区别。然而,高丛越橘叶片气孔特征对高温的响应在不同品种间却存在着较大的差异。高温改变了‘海岸’‘蓝脊’‘布里吉他’和‘蓝丰’的气孔结构特征,但没有对‘奥尼尔’和‘公爵’产生影响;同时,高温导致‘奥尼尔’和‘布里吉他’叶片气孔的空间分布变得更加规则。另外,高温处理导致高丛越橘品种叶片的净光合反应速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)均呈先升高后降低的趋势,但其最大值随着品种的不同而发生变化。【结论】高温条件下高丛越橘通过调整气孔结构特征和优化气孔的空间分布格局来进一步提高气体交换效率。然而,气孔结构和功能进行调整和优化的能力在品种间存在较大的差异,最终导致了各品种叶片气体交换参数对高温响应的不同,特别是在抵抗极端高温方面表现得尤为突出。

关键词(KeyWords)： 越橘;高温胁迫;气孔结构和功能;气孔分布格局;气体交换

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年项目(31400418);; 中国博士后基金面上项目(2014M561044);; 辽宁省科技计划项目(2013204001)

作者(Author): 朱玉;黄磊;郑云普;郝立华;姜国斌;王贺新;李根柱;张自川;弓晓杰;

Email:

DOI: 10.13925/j.cnki.gsxb.20150221

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