Study Of Histological And Cellular Anatomy Of Pistils And Other Floral Parts Of Rhododendron Simsii

In this paper,Rhododendron simsii Planch,one of the Rhododendron L.plants,is used as the research object.With the technology of paraffin section technique and the method of microscope observation,the flower bud differentiation of Rhododendron,the development of pistil and stamens,and the type of axile placenta are all systematically studied.The developing rule of Rhododendron is basically mastered.In addition,this paper has analysed the surface features of pollen,which is scanned by electron microscope and watched by optical microscope.And,on the basis,the volatile components of Rhododendron leaves in two regions of Mount Qiyun and Fengshan are compared and analysed with the HP6890/5973 N type gas chromatography-mass spectrometry.The results are as follows:1.The innovation in this article is that we found the placentation type of the Rhododendron is different from the typical axial placentation.,this type of placenttion is named as “alienated axial placentation”.It is worth noting that this phenomenon of generating new cells by the ability of the parenchymal cells to restore their division does not last long.2.The location of fertilization of Rhododendron was fertilized at the confluence point,and the development of blastocyst of rhododendron was a baboon blastocyst.The flower bud development order of the Rhododendron mainly experienced several stages: the formation of the anther primordia,the formation of the petal primordium,the formation of the pistil primordia(or the formation of the carpel primordium),the formation of the stamen primordium,and the formation of the ovule primordia period.3.The occurrence of Rhododendron branches,leaves and flowers mainly originates from the cells in the surrounding meristem,but the flowers of the subgenus Rhododendron mainly come from the top aboriginal cell.The branches of Rhododendron exhibited the phenomenon that most of the apical buds degenerated lateral buds instead of the top buds.This may be one of the reasons why the Rhododendron habits are mainly shrubs.4.The types of ovules in the rhododendron are co-existence of straight ovules and inverted ovules,among which straight ovules are the majority,and the location and development process of the ovules of eucalyptus can be briefly described as follows: 1)The “invading” sub-situ of the ovule in the dissimilation axis.On the branches of the atrioventricular chamber;2)The development is caused by the division of epidermal local cell divisions from the branch of the dissociated central axis to produce protrusions → break through the epidermis,producing ovules → the ovules continue to elongate and produce cell divisions at the apex,differentiation zones → production of megaspore mother cells.5.The carpels and midshafts of the ovary that are composed of cuckoos are split by thethin-walled cells at the top of the pedicels.6.The anthers of Rhododendron are butterfly anthers.There are 5 layers of pollen cysts,and the tapetum is glandular tapetum.There may be two anthers in Rhododendron: one is the pollen at the junction between two pollen sacs.The wall of the capsule;the other is the pollen wall around the upper septum of two pollen sacs.Rhododendron pollen is compound pollen and is arranged in a regular tetrahedron with three holes above it and a pattern on the pollen wall.10.The differences in the composition of the rhododendron leaf in the Rhododendron betweenQiyunshan and Fengshan Mountain are mainly reflected in esters and vinyls..The contents of esters in Rhododendron leaves in Fengshan area are higher than Qiyunshan 11.14%;in Rhododendrons in Qiyunshan area is higher than in Fengsan 3.15.%,there are 7 species more than peaks.