Experiments were conducted to evaluate the physiological and the biochemical characteristics of waxy wheat seeds under accelerated aging conditions. Five waxy wheat lines, which were Waxy 1, Waxy 4, Waxy 8, Waxy 9, an...Experiments were conducted to evaluate the physiological and the biochemical characteristics of waxy wheat seeds under accelerated aging conditions. Five waxy wheat lines, which were Waxy 1, Waxy 4, Waxy 8, Waxy 9, and Waxy 15; and five non-waxy wheat lines： S-39, 04J89, Jan-81, III42-4, and II110 were studied. The seeds were subjected to accelerated aging at 40℃, 45℃, 50℃, 55℃, and 60℃, and 90% relative humidity for 0, 2, 4, 6, and 8 days, respectively. The results showed a gradual increase in conductivity and decrease in germination rate during accelerated aging. SOD, POD and CAT activities increased at lowgrade treatment, but decreased at severe treatment. On the other hand, the soluble protein content decreased at 45 ℃, but successively increased, then decreased 50℃. From the above study, it showed that 90% RH at 55℃ was the best accelerated aging condition for optimum efficiency in a shorter period.展开更多
城市化进程中夜间灯光作为重要环境构成,在设计过程中缺乏对植物光敏感性的考量。现有研究表明,ALAN通过干扰植物光周期感知引发物候异常,并影响城市生态及景观,但具体作用机制尚未系统阐明。以杭州市临安区望湖路段银杏行道树为例,探...城市化进程中夜间灯光作为重要环境构成,在设计过程中缺乏对植物光敏感性的考量。现有研究表明,ALAN通过干扰植物光周期感知引发物候异常,并影响城市生态及景观,但具体作用机制尚未系统阐明。以杭州市临安区望湖路段银杏行道树为例,探讨城市夜间灯光对银杏物候特征与生理生化指标的影响规律。设置不同光照强度处理组,同步监测环境参数变化,系统分析城市夜间灯光对植物生长的作用机制。采用无人机航拍,结合图像解析技术测定叶面积指数(leaf area index,LAI),并结合LI-6800光合仪同步测量近光源与远光源叶片的净光合速率、蒸腾速率、气孔导度及胞间CO_(2)浓度;通过浸提法测定叶片的叶绿素含量。结果表明:夜间灯光强度对银杏物候进程具有显著影响,近灯光组银杏的展叶时间略早,但落叶时间提前,且叶持续时间较短;生理生化方面,近光源组净光合速率下降66.8%,胞间CO_(2)浓度降低11.4%,气孔导度减少51.4%,以及蒸腾速率下降62.2%。值得关注的是,叶绿素含量在强光环境下呈现异常波动趋势,表明夜间灯光可能干扰植物正常生理活动。可以看出银杏对夜间灯光表现出显著的敏感性,为城市后续绿化和生态环境保护提供参考。展开更多
基金Supported by National Natural Science Foundation of China (31000712)National Natural Science Fund (31000712)Yunnan Provincial Education Department Scientific Research Program (08Y0166)
文摘Experiments were conducted to evaluate the physiological and the biochemical characteristics of waxy wheat seeds under accelerated aging conditions. Five waxy wheat lines, which were Waxy 1, Waxy 4, Waxy 8, Waxy 9, and Waxy 15; and five non-waxy wheat lines： S-39, 04J89, Jan-81, III42-4, and II110 were studied. The seeds were subjected to accelerated aging at 40℃, 45℃, 50℃, 55℃, and 60℃, and 90% relative humidity for 0, 2, 4, 6, and 8 days, respectively. The results showed a gradual increase in conductivity and decrease in germination rate during accelerated aging. SOD, POD and CAT activities increased at lowgrade treatment, but decreased at severe treatment. On the other hand, the soluble protein content decreased at 45 ℃, but successively increased, then decreased 50℃. From the above study, it showed that 90% RH at 55℃ was the best accelerated aging condition for optimum efficiency in a shorter period.
文摘城市化进程中夜间灯光作为重要环境构成,在设计过程中缺乏对植物光敏感性的考量。现有研究表明,ALAN通过干扰植物光周期感知引发物候异常,并影响城市生态及景观,但具体作用机制尚未系统阐明。以杭州市临安区望湖路段银杏行道树为例,探讨城市夜间灯光对银杏物候特征与生理生化指标的影响规律。设置不同光照强度处理组,同步监测环境参数变化,系统分析城市夜间灯光对植物生长的作用机制。采用无人机航拍,结合图像解析技术测定叶面积指数(leaf area index,LAI),并结合LI-6800光合仪同步测量近光源与远光源叶片的净光合速率、蒸腾速率、气孔导度及胞间CO_(2)浓度;通过浸提法测定叶片的叶绿素含量。结果表明:夜间灯光强度对银杏物候进程具有显著影响,近灯光组银杏的展叶时间略早,但落叶时间提前,且叶持续时间较短;生理生化方面,近光源组净光合速率下降66.8%,胞间CO_(2)浓度降低11.4%,气孔导度减少51.4%,以及蒸腾速率下降62.2%。值得关注的是,叶绿素含量在强光环境下呈现异常波动趋势,表明夜间灯光可能干扰植物正常生理活动。可以看出银杏对夜间灯光表现出显著的敏感性,为城市后续绿化和生态环境保护提供参考。
