松杉类裸子植物的大孢子叶球理论评述

松杉类裸子植物的大孢子叶球理论评述

Theories about the seed scale of conifers are reviewed. The classical Foliar Nature theory of Delpino & Penzig suggested that the ovuliferous scales in pine are homologous to the foliar appendages of a cone axis. The Ligular theory of Sachs & Eichler maintained that the seed scale of conifers is comparative to a ligule, because it grows out from a foliar organ, namely the bract. Bessey thought that the seed scale of conifers is the combined outgrowths of an ovule from its chalazal end, which is a sui generis structure thereafter. Kubart misproposed the aril nature of the ovuliferous structure in Juniperus. Arber’s Partial-Shoot theory held that an ovuliferous scale is homologous to a simple and limited shoot (a partial shoot) based on the Telome theory, but Meeuse remarked that the Telome theory was abused here. Dupler emphasized the integumental nature of the ovuliferous scales in taxads. The Brachyblast theory of Braun has increasingly convinced the present botanists on account of excellent studies from teratology, anatomy, ontogeny and palaeobotany. Based on the established evidence from teratology, anatomy, ontogeny and palaeobotany, the present authors believe that the seed scales of living conifers may have evolved from the secondary reproductive branches of the early conifers by phylogenetic metamorphism and fusion, and little differentiation during ontogeny in the living representatives.

作 者： 杨永 傅德志 YANG Yong FU De-Zhi   作者单位： 中国科学院植物研究所,  刊 名： 植物分类学报  ISTIC SCI PKU 英文刊名： ACTA PHYTOTAXONOMICA SINSCA  年，卷(期)： 2001 39(2)  分类号： Q949  关键词： Gymnosperms   Conifers   Seed-scalecomplex   Megastrobilustheory  

【松杉类裸子植物的大孢子叶球理论评述】相关文章：

创新系统研究的理论、评述与整合04-27

承认的哲学:霍耐特承认理论评述04-27

叶笛侃“球”_900字11-06

英语新闻的批评性语篇分析:理论评述和实例分析04-26

开题报告的评述(作业)04-27

社会学仿真评述04-27

睡莲科系统位置评述04-26

党员三述两评述职报告10-25

水环境承载力研究评述04-26

对萧儒调查报告的评述04-27