大白杜鹃子房解剖结构及其生态意义

摘要

The ovary anatomical structure of Rhododendron decorum Franch and its changes during the fruit development were ob-served by using conventional paraffin section method,and its ecological significance was also analyzed. The results indicated that the pistil of R. decorum was compound pistil and had open-type of style with wet stigma. The ovary was of axile placentation with a large number of ovules.The ovules were developed obviously 30 days after pollination.The septum was developed from the ovary wall 60 days after pollination. The septum was formed and the seed wing was developed 90 days after pollination.The seed wing was formed and the hilum was developed 150 days after pollination.The ovary wall of R.decorum was thick and hard,which provided a good protection for the seed development,and was a performance of plant adaptivity to the environment. Meanwhile, the huge number of seeds also en-sured the source of species reproduction in the nature.%用常规石蜡制片对大白杜鹃(Rhododendron decorum Franch)的子房解剖结构及其在果实的发育过程的变化进行了观察,并对其生态意义进行了分析.结果表明:大白杜鹃雌蕊为复雌蕊,湿柱头,花柱为开放型花柱,胚珠数量众多,中轴胎座.授粉后30 d胚珠发育明显;授粉后60 d子房壁发育出隔片;授粉后90 d隔片发育完成,种子发育出尾翅;授粉后150 d种子尾翅发育完成,种脐明显.大白杜鹃雌蕊子房壁厚而坚硬,为种子的生长发育提供了良好保障,是植物对其生境适应的一种表现.同时,众多的种子数量也从源头保证了物种的繁衍.