银杏叶生物学特性研究_杨天秀.pdfVIP

第25 卷第4 期 西 南 农 业 大 学 学 报 ( 自然科学版) Vol. 25,No. 4 2003 年8 月 Journal of Southwest Agricultural Uni ersity ( Natural Science) Aug. 2003 : 1000- 2642( 2003) 04- 0313- 03 杨天秀, 成明昊 ( , 400716) : 对大量成年银杏树和实生苗叶片形态及叶柄解剖结构的观察认 , 银杏叶主要 扇形, 还有相当部分的楔形 叶蒲扇形叶和心形叶, 亦有少量的畸形叶, 共5 个类型; 银杏叶片叶裂的深浅叶裂数的多少是其在进化过程中系统 发育的表现, 在长枝的中上部叶片反映出原始性在相近的生态环境条件下, 银杏雌株长枝上叶片长和叶裂深显著 小于雄株, 而长枝粗长比显著大于雄株银杏长枝上的叶片形状和叶柄维管束的形状有较多的类形, 表现出丰富的 生物学多样性, 值得深入研究银杏叶柄维管束周围树脂道就是/ 脂隙0 或/ 油状空隙0 的话, 其有无不能作 其性别鉴 定的依据 : 银杏叶; 叶形; 解剖结构 : S 792. 95 : A STUDY OF THE BIOLOGICAL CHARACTERS OF GINKGO ( GINK GO BIL OBA L. ) LEAVES YANG Tian- xiu, CHENG Ming - hao ( Department of Horticulture, Southwest Agricultural Uni ersity, Chongqing 400716, China) Abstract:The following results were obtained in an in estigation of the morphology of the lamina and the anatomical structure of the petiole of the lea es of adult trees and young seedlings of ginkgo ( Ginkgo biloba L. ) Most of the lea es are fan- shaped, many are in cuneiform, cattail- leaf or heart shape, and a few are irregular in shape. The number of lobes and the depth of leaf di ision are the results of phylogenesis in the e olution of ginkgo . The lea es on the long branches are primiti e. In similar ecological habitats, lamina length and di ision depth of the lea es are smaller and the ratio of thickness to length of the long branches is greater in the female plants than in the male plants. Considerable ariations ex ist in the shape of lamina and petiole ascular bundles of the long branches, demonstrating rich biodi ersity of ginkgo. Resin ducts are present around the ascular bundles in the petiole and, if they are the resin ca ity. or/ resin- oil- cell space0 as described in someworks, their presence