极度濒危树种羊角槭花部形态特征及开花动态

doi:10.7525/j.issn.1673-5102.2019.03.002

植物研究 ›› 2019, Vol. 39 ›› Issue (3): 329-337.doi: 10.7525/j.issn.1673-5102.2019.03.002

极度濒危树种羊角槭花部形态特征及开花动态

陈香波^1,2, 吕秀立^1,2, 刘杨^1,3, 赵明水⁴, 崔心红^1,2, 张冬梅^1,2

1. 上海市园林科学规划研究院, 上海 200232;
2. 上海城市困难立地绿化工程技术研究中心, 上海 200232;
3. 江西农业大学园林与艺术学院, 南昌 330045;
4. 浙江天目山国家级自然保护区管理局, 杭州 311300

收稿日期:2018-11-05 出版日期:2019-05-05 发布日期:2019-05-11
通讯作者: 张冬梅 E-mail:418517920@qq.com
作者简介:陈香波(1972-),女,高工,主要从事植物资源研究。
基金资助:
上海市绿化和市容管理局项目（G102406）；上海市科委重点研发项目（17DZ1201801）

Floral Morphology and Flowering Process of Acer yangjuechi, the Extremely Endangered Plant

CHEN Xiang-Bo^1,2, LÜ Xiu-Li^1,2, LIU Yang^1,3, ZHAO Ming-Shui⁴, CUI Xin-Hong^1,2, ZHANG Dong-Mei^1,2

1. Shanghai Academy of Landscape Architecture Science and Planning, Shanghai 200232;
2. Shanghai Engineering Research Center of Landscaping on Challenging Urban Sites, Shanghai 200232;
3. College of Landscape Architecture and Art, Jiangxi Agricultural University, Nanchang 330045;
4. Management Office ofTianmushan National Nature Reserve, Hangzhou 311300

Received:2018-11-05 Online:2019-05-05 Published:2019-05-11
Supported by:
Research project of Shanghai Administration Bureau of Afforestation and City Appearance(G102406);Key Research and Development Projects of Shanghai Science and Technology Commission(17DZ1201801)

摘要/Abstract

摘要： 以天目山自然保护区人工栽培的濒危树种羊角槭（Acer yangjuechi Fang et P.L.Chiu）为研究对象，于花期观察了花部形态特征、单株与群体水平开花动态，分析开花与结实的关系，结果表明：1.羊角槭花杂性、顶生花序着生有雄花和两性花，两性花多位于花轴顶端，雄花位于侧生轴顶端或下部，花序雄花与两性花数量比为三角槭的2.6倍，羊角槭枝条两性花偏少；2.观察到两种形态雄花，Ⅰ型雄花子房微型、柱头极度短缩呈黑点状、花盘较平，Ⅱ型雄花子房退化成一团白色绒毛，2裂柱头隐现，花盘较厚、辐射状凹裂；两性花子房成扁球状突出，柱头显著伸出，花丝长度短于雄花；3.单株两性花早于雄花开放，两性花集中于3日以内开放，呈集中开放模式，而对应此时同株上只有极个别雄花（7%以下）处于散粉阶段；4.群体两性花开放时期略早于雄花，二者间存在相对的间隔期。由此对羊角槭开花与种胚发育影响因素进行了探讨。

关键词: 濒危植物, 羊角槭, 花部形态, 开花进程, 种胚败育

Abstract: To reveal the reproduction mechanism of low embryo development rate, the floral morphology and flowering process of Acer yangjuechi Fang et P.L.Chiu, the extremely endangered plants in Chinawas determined by testing trees cultivated in National Nature Reserve of Tianmu Mountain, Zhejiang Province.The results show that:(1)Bisexual flowers and maleflowers are inserted on a same apical inflorescence, and the bisexual flowers are always on the top of rachis while maleflowers on lateral rachis top or bottom. The quantity ratio of maleflowers to bisexual flowers is 6.89 of 2.6 times exceeding to A.buergerianum, which indicates less bisexual flowers of A.yangjuechi than A.buergerianum. (2)Two type of maleflowers were observed. Type Ⅰmaleflowers have tiny ovary, the stigma shortened extremely to a black spot and with flat flower disc while Type Ⅱmaleflowers have biforked stigma outstanding upon ovary degenerated into white fluff and with thick and radial sunken flower disc. Bisexual flowers possess of outstanding oblate spheroid and shorter filament compared with maleflowers. (3)The flowering process of individual tree is of bisexual flowers flowering within 3 days previous to maleflowers while only under seven percent of maleflowers were on pollination stage at the same time. (4)For population flowering process, the flowering stage between bisexual flowers and maleflowers present an obvious interval and bisexual flowers flowering intensively previous to maleflowers. Therefore, the main cause of the high embryo abortion, which leads to endangered situation of A.yangjuechi, was discussed.

Key words: endangered plant, Acer yangjuechi, floral morphology, flowering process, embryo abortion

中图分类号:

S792.35

陈香波, 吕秀立, 刘杨, 赵明水, 崔心红, 张冬梅. 极度濒危树种羊角槭花部形态特征及开花动态[J]. 植物研究, 2019, 39(3): 329-337.

CHEN Xiang-Bo, LÜ Xiu-Li, LIU Yang, ZHAO Ming-Shui, CUI Xin-Hong, ZHANG Dong-Mei. Floral Morphology and Flowering Process of Acer yangjuechi, the Extremely Endangered Plant[J]. Bulletin of Botanical Research, 2019, 39(3): 329-337.

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极度濒危树种羊角槭花部形态特征及开花动态

Floral Morphology and Flowering Process of Acer yangjuechi, the Extremely Endangered Plant

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