THE RELATIONS OF SEED DORMANCY WITH ABSCISIC ACID AND SEED COAT IN KOREAN PINE

The presence of abscisic acid (ABA) in Korean pine seed extract was identified by gaschromatography-mass spectrometry (GC-MS) in our experiment. Levels of ABA of differentparts of seeds stratified and unstratified or washed and unwashed were quantified by gaschromatography (GC). The highest content of ABA was found in the seed coat (1.105μg/gair dried specimen) before stratification. The ABA contents of different parts decreasedobviously after stratification or washing. The decreases in ABA contents of seed coats,stratified or washed, were the same (from 1.015μg/g to 0.015μg/g). The ABA contents ofthe endosperm and embryo of washed seed were lower than those of the stratified seed (Table1). The washed seeds could not germinate, but if the seed coat was broken by gripping, itwould germinate gradually. Even if the seed coat of the unwashed seed was broken, the sameresult occurred. The germination capacities of both reached 62% and 58% respectively. Theseresults indicate that the dormancy of Korean pine seed is not closely correlated with ABA.Our test shows that the seed coat was permeable to water. Therefore, we come to the con-clusion that the only possible factors to cause dormancy in Korean pine seed will be themechanical resistance and/or gas impermeability of seed coat.     

基于资源调度的远程在线实验室设计

远程在线教育实验室和基于Web的远程学习课程一样迅速地部署在世界各地传统的校园里.本文介绍了远程在线实验室资源调度系统,以用来为地理上分散的多用户协调共享实验室资源,避免用户在时间上的资源冲突,并为不同用户请求提供三种不同优先级处理的功能.     

多功能网络化控制实验系统的教学

为满足自动化及其相关专业本科生和研究生的“网络化控制技术”课程教学需求,本文设计了基于CC2530的网络化控制实验系统.该系统具有节点组网、实时数据采集、LCD显示控制、串口通信、功耗模式选择、无线通信、Z-Stack点到点通信和MESH网通信等多项功能.该系统除了可应用到“网络化测控技术”课程的实践教学以外,也可以作为物联网系统设计项目的开发平台.     

红松种子休眠与脱落酸及外种皮的关系

本文用气相层析、色质联用测定了红松种子层积前后和水洗前后各部分脱落酸(ABA)的含量。层积前,外种皮的含量最高(1.105微克/克风干样)。层积后和水洗后,各部分ABA含量都明显下降。两种处理后,外种皮中ABA含量下降程度相同,均由1.105微克/克下降到0.015微克/克风干样,而水洗后的胚和胚乳与层积后的相比,其ABA含量下降得更多。但水洗后的种子萌发率很低,而无论经水洗的还是未洗的种子,当夹破外种皮后,萌发率都相当高(分别为58％和62％)。因此红松种子的休眠与ABA可能无直接关系。同时,吸水率的试验说明它的外种皮是透水的,所以,红松种子休眠的主要原因可能是外种皮的机械和/或透气性障碍。