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Bulletin of Botanical Research ›› 2023, Vol. 43 ›› Issue (2): 311-320.doi: 10.7525/j.issn.1673-5102.2023.02.016

• Reproductive biology • Previous Articles    

Flowering Biological Characteristics and Breeding System of the Rare and Endangered Plant of Sinojackia microcarpa

Changrui TAI, Kai ZHAO(), Yanfang YANG, Yan WU, Wei ZHAI, Yuewei TONG   

  1. Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui,College of Life Sciences,Anqing Normal University,Anqing 246133
  • Received:2022-09-20 Online:2023-03-20 Published:2023-03-07
  • Contact: Kai ZHAO E-mail:zhaokai1911@126.com
  • About author:TAI Changrui(1998—),female,master student,mainly engaged in plant ecology.
  • Supported by:
    Anhui Provincial Key Laboratory of Biodiversity and Ecological Protection in Southwest Anhui Province(2020ZD04);National New Agricultural Science Research and Reform Practice Project of Ministry of Education in 2020;State Forestry Administration and Grassland Administration Investigated the Project Funded by Planning and Design Institute


In order to illustrate the flowering characteristics and sexual reproduction of the rare and endangered plant Sinojackia microcarpa, the morphological characteristics of flower, flowering dynamics, pollen ovule ratio(P/O), stigma receptivity, pollen viability, bagging experiment, pollinator insects and pollinator frequency were investigated respectively. The results showed that: (1)the hybridization index(OCI) was four, the flowering period was 5-7 d, and the flowering period of the population lasted 20 d. Pollen to ovule ratio was 4 093.21±498.56. The pollen viability was the highest on the third day after flowering(76.21%), but the lowest on the seventh day after flowering(18.37%). The most suitable period of stigmas was on the second day after flowering. (2)The bagging result showed that: there were some self-incompatibility and no apomictic reproduction in S. microcarpa. Pollinators were necessary for the reproductive process of S. microcarpa, and cross-pollination could improve the rate of fruit and seed setting. There were seven species, five families and three orders in the visiting insects of S. microcarpa. The main pollinators were Xylocopa appendiculataBombus sp.,Vespa sp.,Apis ceranaEpisyrphus balteatus. The average pollinator frequency of Bombus sp. was (8.67±0.21) times per hour. Further research on the biological characteristics of flowering and breeding system of this species would be helpful to further explore the mechanism of its endangerment, and provided theoretical basis and reference for future studies on rare and endangered plants.

Key words: Sinojackia microcarpa, flowering characteristics, flower visiting insects, breeding system

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