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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (3): 329-337.doi: 10.7525/j.issn.1673-5102.2019.03.002

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

CHEN Xiang-Bo1,2, LÜ Xiu-Li1,2, LIU Yang1,3, ZHAO Ming-Shui4, CUI Xin-Hong1,2, ZHANG Dong-Mei1,2   

  1. 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)

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

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