Primula brevifrons Borb.

Ohne Zusammenfassung     

529. Primula Moupinensis

Summary.  Primula moupinensis Franch. is described and illustrated; details of its ecology and its cultivation are given.     

滇北球花报春和滇海水仙花的光合特性研究

用LI-6400便携式光合测定仪对引种栽培的滇北球花报春和滇海水仙花的光合参数进行测定,以探讨其光合生理特性.结果表明:(1)滇北球花报春的净光合速率(P_n)和蒸腾速率(T_r)日进程曲线均呈"单峰"型,它们的峰值分别出现在13:00和16:00;滇海水仙花的P_n、Tr较滇北球花报春低,且在一定范围内保持稳定,没有明显的峰值,与滇北球花报春表现出较明显的种间差异;(2)两种报春比叶重( LMA)和叶氮含量(LNC_a)对其光合相关特征参数没有显著影响,而叶氮在Rubisco中的分配系数PR、生物能库中的分配系数P_B和光合组分中总氮含量N_P与光合特征参数LCP、V_(cmax)、J_(max)、CE具有显著的正相关关系;(3)滇北球花报春具有较高的气孔导度(G_s)、P_n和T_r,对强光、高温、低湿度表现出较强的环境适应性,表现出较强的光合能力.     

Osservazioni sulla polistelia in Primula glaucescens Moretti e Primula longobarda Porta

Abstract

Notes on the polystelic structure in Primula glaucescens Moretti and Primula longobarda Porta. — The rhizome anatomy of Primula glaucescens Moretti and Primula longobarda Porta (two species endemic to Lombardy) have been studied. It has been found that the polystelic structure is present in the rhizome of both species, but with some differences. The taxa show a difference in the number and size of steles and amount of sclerenchymatic tissue within the single stele.

Our investigations confirm the necessity to separate in a specific rank Primula glaucescens Moretti from Primula longobarda Porta, as already proposed by Arietti and Crescini (1976).     

Primula villosa-Auricula

Ohne Zusammenfassung     

In vitro regeneration in Primula ssp. via organogenesis

Culturing pedicle segments of primroses on a medium supplemented with 2,4-dichlorophenoxyacetic acid (2, 4-D) and thidiazuron (TDZ) resulted in callus induction rates of about 80%. The highest shoot regeneration rate (1.8 shoots per explant; mean of ten genotypes) was achieved with the combination of 2.0 mg/l 2, 4-D and 2.0 mg/l TDZ. Culture on a medium containing a high concentration of nitrate (for example, B5 medium) negatively affected the survival of regenerated shoots of one genotype, Gelb IV 48, probably due to an increase in the pH value of the medium. Consequently, the highest efficiency was obtained using a basal medium containing half-strength Murashige and Skoog macroelements. A protocol to regenerate shoots of Primula vulgaris and P. elatior is described.     

Primula subansirica G.D. Pal is not a Primula (Primulaceae), but rather belongs to Gesneriaceae

Examination of type specimens has shown that Primula subansirica G.D. Pal is a Gesneriad and conspecific with Beccarinda cordifolia (Anthony) B.L. Burtt (Gesneriaceae), thus a reduction is made and a new synonymy is proposed.