王蛟;王力荣;曹珂;张绍铃;朱更瑞;方伟超;陈昌文;张佳卉;

• 1:中国农业科学院郑州果树研究所
• 2:南京农业大学生命科学学院

摘要(Abstract)：

【目的】为明确高可溶性固形物含量种质‘金蜜狭叶桃’单叶及群体光合特性,以‘中农金辉’、‘红珊瑚’为对照,对其光合相关的生物学特性、冠层光照强度及净光合速率(Pn)季节变化等指标进行分析。【方法】采用石蜡切片、乙醇浸提法及田间调查等方法,对叶片解剖结构、叶绿素含量及叶片和枝条的形态学特性进行分析;利用Li-6400型气体交换系统,测定了‘金蜜狭叶桃’和两对照的净光合速率季节变化及群体光合特性。【结果】1)‘金蜜狭叶桃’生物学特性主要表现为,栅栏组织厚度、海绵组织厚度、叶片厚度及比叶重均显著高于‘中农金辉’和‘红珊瑚’(P<0.05);叶绿素a、b含量、叶宽、叶面积均显著小于两对照(P<0.05);其成枝率极高(65.5%),但坐果率极低(3%);新枝停长期比两对照提前20 d。2)‘金蜜狭叶桃’树冠内部光照强度及相应的净光合速率均显著大于两对照(P<0.05),并且光照强度在上、中、下三层间分布较均匀。3)‘金蜜狭叶桃’树冠外围单叶净光合速率日变化在5—7月份呈单峰曲线,8—9月份呈双峰曲线,光合"午休"不明显。【结论】‘金蜜狭叶桃’主要表现为成枝率高,叶绿素含量低,叶片厚;冠层内部光照强度高,对应的净光合速率大,光合"午休"不明显。

关键词(KeyWords)： 桃;净光合速率;叶片解剖结构;光照强度

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王蛟;王力荣;曹珂;张绍铃;朱更瑞;方伟超;陈昌文;张佳卉;

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