Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-29 Cooperative journals: 《广西植物》
Abstract： Primula Hance (Gesneriaceae) is a group that has attracted much attention in recent years. Its intricate species diversity and its endemic distribution among species have aroused great interest among taxonomists and botany researchers. Except for a few species, such as Primulina eburnea (Hance) Y. Z. Wang, most species have a very narrow distribution range, which belong to narrow distribution species or endemic species. In order to reveal the effects of the pollination biology and breeding system of P. eburnea on its reproductive process and colonization ability, we systematically studied the flowering phenology, the pollen and stigma viability, the species and visiting behavior of flower visiting insects, the pollen ovule ratio, the OCI index and the seed setting rate of manipulated pollination of P. eburnea. Besides, we explored whether its reproductive processes such as pollination had a positive effect on the spread of P. eburnea. The results showed that the natural flowering stage of P. eburnea was from March to May, and the entire flowering stage was about 45 days. Its full flowering stage was about 20 days, and the single flower flowering stage was 6–8 days. Pollens had the strongest viability 1–2 days after flowering, stigma did not have receptivity before flowering. The pollen ovule ratio was 537, and the hybridization index was 5. Bagged and emasculation could not bear fruit, which indicated that this species did not have apomixis. Compared with natural pollination, the seed setting rate of hand self-pollination was slightly lower, and the seed setting rate of hand xenogamy was slightly higher, which indicated self-compatibility. The main pollinators of P. eburnea were Anthophora florea and Bombus sp. Therefore, higher nectar volume, larger pollen amount and stronger pollen viability of P. eburnea were obviously beneficial for it to complete the entire process of pollination and reproduction. This result was obviously conducive to the colonization of P. eburnea and then widely spread in the karst areas of South China to Southwest China.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-02 Cooperative journals: 《广西植物》
Abstract：该文报道了产自西藏自治区墨脱县境内的线柱苣苔属（Rhynchotechum）中国分布新记录——小花线柱苣苔(R. parviflorum Blume)。该种常生长在林中溪流附近的崖壁以及次生林下阴湿生境中。本种主要辨别特征为叶基本对生，花萼裂片被绢毛，花梗被黄褐色绒毛，花冠筒较小，子房具短柔毛，果无毛至微柔毛。印度学者于2020 年记载为印度新分布，而原始文献中记录的凭证标本采集点位于中国西藏自治区墨脱县境内，故对原文记述的产地信息提出质疑。同时，在前人的研究中部分馆藏的线柱苣苔属植物标本被认定为本种，在此一并提出该种在中国的分布地理信息和详细描述。
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-02 Cooperative journals: 《广西植物》
Abstract：苦苣苔科原大花旋蒴苣苔(Boea clarkeana)为我国特有的复苏植物，在最近的修订中被并入套唇苣苔属(Damrongia Kerr)，更名为大花套唇苣苔(D. clarkeana )。本研究以大花套唇苣苔成熟种子为试验材料，通过观察钙盐和模拟干旱互作试验对其种子萌发和幼苗生长的影响，以期探究该植物对喀斯特特殊生境的适应机制。结果表明：钙盐及模拟干旱互作时，低浓度钙盐可减轻干旱对种子萌发和幼苗生长的抑制作用，并且低程度的干旱与低浓度的钙盐相互作用时反而会促进种子萌发和幼苗生长；低钙盐低旱复合条件对大花套唇苣苔生长的促进作用也体现了该物种对喀斯特地区保水性差的石灰岩土壤基质的专适性，也避免了和其他植物直接生态位的竞争。
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