论文部分内容阅读
运用石蜡切片技术 ,对樟科的紫楠〔Phoebesheareri (Hemsl.)Gamble〕、浙江楠 (Ph .chekiangensisC .B .Shang)、香樟〔Cinnamomumcamphora (Linn .)Presl.〕、浙江桂 (C .chekiangensisNakai)、细叶香桂 (C .subaveniumMiq .)、江浙山胡椒 (LinderachieniiCheng)、钓樟 (L .reflexaHemsl.)、狭叶山胡椒 (L .angustifoliaCheng)、乌药〔L .aggregata (Sims)Kosterm .〕、红脉钓樟 (L .rubronerviaGamble)和山苍子〔Litseacubeba (Lour.)Pers .〕等 4属11种植物雌蕊群的维管分布格局进行了连续解剖观察 ,结果表明 ,成熟雌蕊群仅有 1枚心皮 ,具 1背缝维管束、1腹缝维管束 (部分保留 2束 ) ,并有可能是由具多数离生心皮 (或多或少不同程度趋向联合 ) ,且各心皮具数枚胚珠的祖先类群经历心皮数目、胚珠数目的逐步减少所形成的假单基数合生心皮 (假单心皮 )。这一结果及推论不仅与Cronquist等关于樟科雌蕊群的观点相吻合 ,而且对樟科雌蕊群的系统发育作了进一步阐述。观察还发现樟科植物心皮结构的原始性 ,即心皮远轴端未真正愈合。
The paraffin sections were used to detect the content of Phoebesheareri (Hemsl.) Gamble, Ph. Chekiangensis C.B.Shang, Cinnamomum camphora (Linn.) Presl., C.chekiangensisNakai ), C. Subavenium Miq., Linderachienii Cheng, L.reflexa Hemsl., L. angustifolia Cheng, L. gagregata (Sims) Kosterm.], Red The vascular distribution patterns of the gynogenetic groups of 11 genera of 4 genera, including L. rubronervia Gamble and Litseacubeba (Lour.) Pers., Were continuously dissected and observed. The results showed that there was only one mature gynoecium Carpels with a dorsal vascular bundle, a venous septum vascular bundle (part of the reserve 2), and may be from the majority of free carpels (more or less different degrees of convergence), and each with a few carpels The ancestral taxa of ovules undergo pseudocapsules (fake single carpel) formed by a gradual reduction in the number of pericarp and ovule. This result and inference not only coincides with Cronquist’s view on the Lauraceae gynoecium, but also elaborates on the phylogeny of Lauraceae gynogenetic group. Observation also found that the original structure of Lauraceae carpel structure, that is, the cephalic distal end is not really healing.