林业科学2013，Vol.49Issue(8)：108-116,9.DOI:10.11707/j.1001-7488.20130816
银杏垂乳个体发生及系统学意义
Ontogenesis and Systematics Implications of Ginkgo biloba Chichi
摘要
Abstract
Chichied ginkgo is a distinctive germplasm in ginkgo family.Ginkgo biloba chichi is divided into rooted chichi,stemmed chichi and branched chichi.There are 348 chichied ginkgo trees in China distributed in 19 provinces,and there are 43 plants in Japan.Chichied ginkgoes have no relations with gender but the most of chichied ginkgoes are older than 300 years.Chichi is coniform shaped with rough bark and grows vertically downward.These chichies can produce roots and leaves when they have grown down to the ground.Chichi on the tree can be a single appearance or a few aggregate.The tip of chichi has no apical meristem and only has cambium,secondary xylem and phloem.The median longitudinal sections exhibited various orientations of the tracheids at 1 cm from the tip of chichi.However,the sections revealed that tracheid orientation changed from being very variable in the centre to a more normal orientation as the cambium's at 7 cm from the tip.There are many theories on the chichi occurrence mechanisms,including Auxin theory,callus or adventitious bud theory,environmental mutagenesis theory,pathology or senility theory and cotyledon bud theory.Ginkgo biloba chichi probably has important ecology and systematics implications to the growth,development,vegetative propagation,wildness and long-lived of Ginkgo biloba.关键词
银杏垂乳/解剖特征/个体发生/生长素/系统学Key words
Ginkgo biloba / anatomical characteristic / ontogenesis/ auxin / systematics分类
农业科技引用本文复制引用
邢世岩,张倩,付兆军,刘莉娟,刘晓静,辛红,吴岐奎..银杏垂乳个体发生及系统学意义[J].林业科学,2013,49(8):108-116,9.基金项目
国家科技支撑计划课题(2012BAD21B04) （2012BAD21B04）
山东省农业良种工程课题(201009) （201009）
国家自然科学基金项目(31070589). （31070589）
