龙额观光木果实性状及结实规律调查研究

STUDY ON FRUIT CHARACTERISTICS AND GROWTH LAW OF TSOONGIODENDRON ORDORUM CHUN. IN LONG'E AREA OF GUIZHO PROVINCE

对我国特有、古老孑遗植物观光木果实性状和结实规律调查研究发现:同一居群内,不同单株,株间1株内的单果,1心皮胚珠形成种子的变异幅度较大,为36 00%～121 51%;其次是单果长、粗,果心皮厚,胚珠形成种子数,1心皮胚珠未形成种子数,为12 80%～34 79%;其余均在10%以下。结实规律,单果有效种子的形成,不同方向,阳面大于阴面54 7%;不同部位,上部大于中、下部14 5%和27 3%,中部大于下部14 9%。株间单果有效种子的形成,立地条件较好,营养生长过盛的植株较低。

Tsoongiodendron ordorum Chun. is endemic and relic species in China. From the investigation of fruit characteristics and growth law of Tsoongindendron ordorum Chun. in Long'e area. the results are as follows. At the same area, in different trees, there is large variation for seeds from single fruit. Monocarpellary ovule is 36.00%～121.51%. The second is when ovule in long, rough and thick carpel becomes a number seeds, monocarpellary ovule does not form seeds. It is 12.80%～34.79%. The rest is below 10%. About the formation of active seeds in single fruit, the place in sunlight is 54.7% largre than the reverse place. The top is 14.5% larger than the middle, and 27.3% larger than the bottom. The middle part is 14.9% larger than the bottom. In the formation of active seeds in single fruit, plants with good soil and over nutrition growth are low.