In order to study the morphological and structural changes of ovules“ abortion process of Cunninghamia lanceolata,the morphology and structure of the fertile ovules and the abortive ovules were observed by semi-thin section method with Epon 812 as embedding medium.The results showed as follows.As the abortive seed,the pollen tube grew in the aborted ovule could continue to extend to the chalazas of the ovule which would make preparation for the fertilization which was similar to the fertile ovule.Normally developed female gametophyte could be formed in the centre of the nucellus in the fertile ovule,while the normal female gametophyte could not be formed in the abortive seed ovule because of the reduced nucellus which would lead failed fertilization.Material firstly appeared at the micropyle of abortive ovules,and then gradually extended to the basal part of theovule.In fertile ovules,the nucellus tissues would be degraded during the process of the female gametophyte development;while in the abortive ovules,the nucellus tissues were retained as the abnormal female gametophyte development.
国家科技期刊平台
NSTL
维普
万方数据
