Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-26 Cooperative journals: 《广西植物》
Abstract： Camellia perpetua is the only rare and endangered plant in the genus Camellia that blooms almost all year round. It provides reference for people to know the flower bud differentiation process and the changes of endogenous hormones in leaves at different flower development period and annual growth cycles, as well as clarify the continuous flowering mechanism of this species. In this study, the process of C. perpetua bud differentiation was observed by paraffin sections. The contents of abscisic acid (ABA), indole-3-acetic acid (IAA), gibberellin (GA3) and zeatin nucleoside (ZR) in leaves at different flower development period and in leaves with flower bud and leaves without flower bud in annual growth cycle were determined by enzyme-linked immunosorbent assay (ELISA). The results were as follows: (1) The flower bud differentiation sequence of C. perpetua was from the outside to the inside, and it was divided into 6 period, which lasted 35 days in total, from the bud differentiation to flowering about 2 months. (2) The contents of ABA and GA3 and the ratios of GA3/ABA and (IAA + GA3) /ZR were higher in flower bud morphological differentiation period, while the content of IAA and ZR and the ratios of IAA/ABA and ZR/ABA were lower. (3)The contents of ABA, IAA and ZR in the leaves with flower bud were higher than those in the leaves without flower bud. The IAA/ZR and (IAA + GA3) /ZR ratios were lower than those of the leaves without flower bud. In conclusion, the flower bud differentiation to flowering time of C. perpetua is shorter. High levels of ABA and GA3 and low levels of IAA and ZR are beneficial to flower bud differentiation. Higher levels of ABA, IAA and ZR are beneficial to flower bud development.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Guangxi Zhuang Autonomous Region is located in South China, with humid climate, complex habitats and rich species diversity. Thirteen species of orchids are reported as new records from Guangxi Zhuang Autonomous Region, viz. Kuhlhasseltia yakushimensis (Yamamoto) Ormerod, Risleya atropurpurea King et Pantl., Stigmatodactylus sikokianus Maxim. ex Makino, Vrydagzynea nuda Bl., Apostasia shenzhenica Z. J. Liu & L. J. Chen, Bulbophyllum nipondhii Seidenf., Chamaegastrodia nanlingensis H. Z. Tian & F. W. Xing, Goodyera pendula Maxim., Hetaeria anomala Lindl., Liparis brunnea Ormerod, Luisia appressifolia Aver., Tropidia emeishanica K. Y. Lang, and Zeuxine nervosa (Lindl.) Trimen. Among them, Kuhlhasseltia J. J. Smith, Risleya King & Pantl., Stigmatodactylus Maxim. ex Makino, and Vrydagzynea Bl. are newly recorded genus in Guangxi. There are 128 genera and 469 species and 4 varieties of Guangxi Orchidaceae. Citation specimens, geographical distribution and pictures of the thirteen newly recorded species are provided．
Subjects: Biology >> Botany >> Applied botany submitted time 2020-09-15 Cooperative journals: 《广西植物》
Abstract：在资料收集和实地调查的基础上，以已知广西现存分布的苦苣苔科“濒危系数”和“优先保护值”，确定了其濒危等级及优先保护次序。结果表明：236 种广西苦苣苔科植物中有
Subjects: Biology >> Botany >> Applied botany submitted time 2018-10-26 Cooperative journals: 《广西植物》
Abstract：本研究以 6 个金槐品种和 2 个米槐品种的花粉为材料，采用美国卡尔蔡司 EVO18 扫描电镜对其极面、赤道面、外壁纹饰等形态特征进行了观察，并对金槐、米槐品种间的亲缘关系进行了分析。结果表明：金槐和米槐花粉的共有特征包括：极面观为三裂圆形，极面光滑；具 3 孔沟，沟较窄且达两极；沟缘中部外凸，具颗粒状突起；沟在极面上没有交会，形成宽大的沟界极区；金槐的花粉粒为长球形，金槐 J6 的极轴最长，金槐 J2 的极轴最短，极轴长/赤道轴长表现的规律与极轴长相一致；网眼直径最大的是金槐 J2，最小的是金槐 J5；网眼密度最大的是金槐 J6，最小的是金槐 J2；米槐的花粉粒为近圆球形，极轴长和极轴长/赤道轴长明显小于金槐，但其赤道轴长大于金槐；双季米槐的赤道轴长、极轴长、极轴长/赤道轴长、网眼密度都小于单季米槐；8 个品种可分为 3 组，其中金槐 J4、金槐 J1 和金槐 J6 3 个品种亲缘关系较近，金槐J5、金槐 J3 和金槐 J2 3 个品种亲缘关系较近，单季米槐和双季米槐 2 个品种亲缘关系较近；花粉形态是鉴别金槐和米槐两大类品种的重要根据，并可为进一步的品种划分提供重要依据。
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