中文题目-应用与环境生物学报.DOCVIP

模拟采食下克隆整合对虉草生长及生理特征的影响* 简敏菲1, 2** 王童童1 余厚平2 罗杰欣1 1江西师范大学生命科学学院 江西省亚热带植物资源保护与利用重点实验室 南昌 330022 2江西师范大学鄱阳湖湿地与流域研究教育部重点实验室 南昌 330022 摘 要 克隆整合对克隆植物适应异质性环境胁迫的作用的研究受到普遍关注，但关于均质性采食下植物克隆整合作用的研究仍十分缺乏。以江西省鄱阳湖-乐安河段河岸带优势根状茎克隆物种虉草（Phalaris arundinacea）为对象，研究均质性采食条件下虉草的生理生态响应以及克隆整合在虉草应对模拟采食两月后发挥的作用。采食强度设置4组水平：不去叶（CK对照组）、去叶25%、去叶50%和去叶75%；克隆整合采用2种方式：茎切断和连接。结果表明，无论是否进行断茎处理，模拟采食均显著（P 5%）降低虉草的叶片数、地上枝总长度、分株数和生物量，采食处理下断茎的虉草分株相对茎连接分株具有更强生长优势。断茎和采食处理对虉草叶绿素含量无显著影响，断茎的虉草分株在25%、50%采食水平下在叶绿素a（Chla）、叶绿素b（Chlb）和总叶绿素（Chlt）含量上均高于茎连接的分株，所有采食处理强度下断茎的虉草分株各叶绿素指标均高于对照组。采食显著影响了虉草分株各光合指标，断茎分株在50%、75%采食水平上的净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、胞间CO2浓度（Ci）等指标均高于茎连接分株，25%采食处理组则相反；采食处理的虉草分株的净光合速率（Pn）、蒸腾速率（Tr）、胞间CO2浓度（Ci）均低于对照组。因此，采食引起虉草分株光合速率下降，使虉草营养物质积累不足，导致虉草生长状态下降。虉草能够在一定程度上适应均质性采食处理带来的压力，但是克隆整合不能显著改善均质性采食条件下虉草的生长。图5表2参40 关键词 虉草；克隆整合；模拟采食；均质性环境；生长指标；光合生理 CLC X173 : X53 Effects of Clonal Integration on Growth and Physioloy of Phalaris arundinacea under Simulated Herbivory* JIAN Minfei 1,2**,WANG Tongtong 1,YU Hou-ping 2LUO Jiexin 1 1College of Life Science, Jiangxi Provincial Key Laboratory of Protection and Utilization of Subtropical Plant Resources, Jiangxi Normal University, Nanchang 330022, China; 2Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, China Abstract Many studies have tested effects of clonal integration on the adaption of clonal plants in heterogeneous environments, but little is known about the function of clonal integration on Chinese native clonal plants under homogeneous stressful environments. We conducted a greenhouse experiment to investigate the ecophysiological response characteristics of Phalaris arundinacea which was collected from the riparian zone of the wetland of Poyang Lake and Lean River in Jiangxi Province, and studied the effect of clonal integration on the dominant plant under two-months cyclical homogenous simulated herbivory condition. Simulated herbivory strength were set at four d