|其他摘要||P.armeniacum S.C.Chen & F.Y. Liu belongs to the genus Paphiopedilum Pfitz, of Subfam. Cypripedioideae of Orchidaceace. This species bears golden-yellow flower with a special shape, so it is a very famous ornamental orchid. Because the wild P. armeniacum always has been facing with the severe collecting stress, and in addition lots of its habitats have been ruined by certain reasons, the P. armeniacum has been listed in the endangered species. To protect wild P. armeniacum, and also to satisfy people’s demand of P. armeniacum, our research group has started artificial propagation and breeding of the P. armeniacum. Now its seed is germinated and seedlings is cultivated successfully, and some satus plants flowered. But it discovered the satus plants used different years to flower, and some plants flowered out of its natural flower period. These questions will have adverse influence to the further development of P. armeniacum, so it is necessary to find out the flower development process of P.armeniacum. It’s expected that based on the settlement of this question, new theoretic foundation and practice direction can be made for the further flowering control research.
In this paper, first, the growth of clone bud of P.armeniacum were traced by observing and measuring and anatomizing, and the leaf number and leaf area were analysed to understand the nutrition it required for its transition from vegatative into reproductive; second, the development of flower bud of P.armeniacum were investigated continually using anatomical method; third, after the flower organs formed, a primary research were done to discover whether the night temperature has any influence to flower. Through the above mentioned work, the following results were gained:
(1). The clone bud of P.armeniacum was usually emerged around the flowering time. A mother plant often produce 1-2 clone buds. In the first year, the clone bud only made vegetative growth. While in the second year, some plants which had 4 or more leaf , and reached certain leaf area would produce flower bud. It hinted the nutrition accumulation maybe a limiting fator to decide whether the clone bud can transfer into reproductive growth.
(2). The ratio of mother plants to clone buds had significant difference in the defloration plants, plants which flower wither naturally, and the fruiting plants, the ratio of deloration plants is the hightest, the fruiting plants is the lowest. It indicated the fruiting plants transported its nutrition to fruit first, as a result the produce of clone bud was inhabited.
(3). P.armeniacum developed inflorescence primodium in May, and sheath in June and July; and bract in July and August; then until at the end of August and September, the flower organs were developed. After that, the flower bud kept on growing. Because of the different relative growth rate and growth direction, the morphology of flower had great change.
(4). From the flower bud produced by plant replanted in different period, following conclusions were concluded: in the early of August, P.armeniacum didn’t finished flower decision, after it was distured, it can not differentiat flower organs; in the middle of August, some plants which developed earlier than others finished the flower decision , after it was disturbed it developed flower organs later than the normal, but not reversed ; then in the early of September , most of plants finished flower decision , and began or finished differentiation of flower organs.
(5). To the individuals which flower organs were formed, within certain scope, the higher the night temperature was, the longer the treating time was, the earlier the plants would flower, while the flowering ratio and flower quality were not affected by different treatment. Through anatomy, it found some abnormally differentiated flower buds, so it thought that whether the P.armeniacum can flower normally were decided by the differentiation process, after that the temperature can only influence how long it will take to flower.|