Is Dendrobium huoshanense better than Dendrobium yunnanense? Let's look at some interesting facts first. Dendrobium candidum in Yunnan has a market share of 60% and has been the largest producing area since 2008. Mount Huoshan is only suitable for planting Dendrobium candidum, which is planted in greenhouse, and the climate in Yunnan is suitable for Dendrobium candidum growth. At present, wild Dendrobium can be found in the wild. Dendrobium candidum was included in the new edition of China Pharmacopoeia, but Dendrobium huoshanense was not included. Dendrobium candidum in Yunnan is also dormant in winter.
Dendrobium candidum has strict requirements on the growth environment, the suitable growth temperature is generally between 10-35 degrees, and the requirements on climate, humidity and light are strict. However, the climate in Yunnan is suitable and the seasonality is not obvious. It is located at 24 degrees north latitude. The average temperature in southern Yunnan, southwestern Yunnan and southeastern Yunnan is about 17 degrees, and the altitude is 800- 1200m. The atmospheric temperature above 80% is suitable for planting Dendrobium candidum. Bian Xiao visited many Dendrobium planting areas in Yunnan. Growers are basically managed by some old people at home. For the convenience of management, Dendrobium is planted in the open air, without watering, just pulling weeds at ordinary times. After domestication and cultivation, it returned to the wild environment to continue to grow, and obtained the most suitable conditions for the growth and nourishment of Dendrobium candidum in Yunnan's unique climate and geographical environment. How can such Dendrobium candidum be the worst?
In terms of polysaccharide content, according to the research of Gong, Wang Xingui [1] and others, the polysaccharide content of Dendrobium candidum from different habitats is 25.15% ~ 36.53%; The determination of D- mannose by high performance liquid chromatography with pre-column derivatization is specific, accurate and reproducible. The mannose content of Dendrobium candidum from different habitats is 18.00% ~ 32.35%. The content of pilocarpine in Dendrobium candidum from different habitats is 0 ~ 0.0043%. The contents of polysaccharide, mannose and mauritanin in Dendrobium candidum from different habitats are significantly different, among which the germplasm collected in Yunnan and Zhejiang have excellent genetic basis in polysaccharide and mannose, while the content of mauritanin in Guangxi germplasm is relatively high. The full text of this article can be viewed on Wanfang, HowNet, Baidu Academic and other platforms.
[1] Gong, Wang Xingui, et al. Comparative study on the quality of Dendrobium candidum from different habitats [J]. Northern Horticulture, 2013 (8):162-165.
How to buy Dendrobium candidum with good quality
There are several points to pay attention to when selecting Dendrobium: first, smell it first, whether it tastes like licorice; Second, break off, if it is easy to break off, it is a good Dendrobium; Third, put one in your mouth to chew. Okay, Dendrobium glue is sticky. If the mucus content is high, it is best to chew it and stick it to the mouth and teeth. Dendrobium candidum with high polysaccharide content has better nourishing effect, so it is necessary to carefully confirm the polysaccharide content of Dendrobium candidum when selecting. The medicinal part of Dendrobium candidum is stem, and the quality evaluation is: less fiber and rich mucus.
It is necessary to distinguish Dendrobium huoshanense from Dendrobium huoshanense.
Huoshan Mountain in Mi Hu is mainly produced in Huoshan County, Anhui Province in Dabie Mountain area, and mostly grows on the misty cliff crevices and towering ancient trees. It is an expensive Dendrobium species at present. Bian Xiao learned that many merchants confuse Dendrobium candidum planted in Huoshan greenhouse with Dendrobium candidum and sell it at a high price. Consumers must pay attention to the difference between Dendrobium huoshanense and Miho Huoshan, which are really two completely different Dendrobium species.
The stem of Dendrobium huoshanense is erect, fleshy, 3-9 cm long, tapering gradually from the top of the base, 3- 18 mm thick above the base, unbranched, with 3-7 nodes, 3-8 mm long in internodes, yellow-green, sometimes with purple spots, and yellowish after drying. The leaves are leathery, with 2-3 alternate leaves on the upper part of the stem, oblique, tongue-shaped oblong, 9-2 1 cm long and 5-7 mm wide, with a dull and slightly concave top and a sheath supporting the stem at the base; Leaf sheaths membranous, persistent.
The petals of Dendrobium huoshanense are oval and rectangular, usually 12- 15 mm long and 6-7 mm wide, with obtuse apex and five veins. The labellum is nearly rhombic, with equal length and width, 1- 1.5cm, with a wedge-shaped base with 1 corpus callosum, slightly 3-lobed upper part, with short hairs between lobes on both sides and white hairs near the base; Flowers bloom in May.