Isolation of 6-Hydroxydehydroabietinol and Hinokiol from the Leaves of Torreya nucifera Sieb,et Zucc

6-Hydroxydehydroabietinol and hinokiol were isolated from the non-steam-volatile fraction of the leaves of Torreya nucifera Sieb, et Zucc. (Taxaceae) (Japanese name “Kaya”). The former was also isolated from the immature fruits of the same plant. This is the first report of the isolation of 6-hydroxydehydroabietinol from a natural source. This compound was prepared previously and reported to show marked estrogenic activity.     

野大豆(Glycine soja Sieb.et Zucc.)一新变种

命名发表了野大豆一新变种,即闭花野大豆Glycine soja Sieb.et Zucc.var.cleistogama C.S.Zhu et S.X.Zhu.     

Two New Buxus Alkaloids from Buxus Microphylla Sieb. et Zucc.

Five compounds were isolated from Buxus microphylla Sieb. et Zucc. Based on the physico-chemical constants and spectral analysis (IR, MS, 1H-NMR and 13C-NMR), they were identified as cycloprotobuxinamine ( Ⅰ ), buxmicrophylline A ( Ⅱ ), buxtauine M ( Ⅲ ), isoscopoletin (Ⅳ) and epi-lupeol ( Ⅴ ). ( Ⅰ ) and ( Ⅱ ) were new compounds. The structure of buxmicrophylline ( Ⅱ ) was confirmed by X-ray crystallographic analysis.     

野大豆(Glycine soja Sieb.et Zucc.)一新变种

命名发表了野大豆一新变种,即闭花野大豆Glycine soja Sieb.et Zucc.var.cleistogama C.S.Zhu et S.X.Zhu。     

崖椒茎的化学成分

从崖椒（Zanthoxglum schinifolutm Sieb.et Zucc.)茎的石油醚、二氯甲烷提取物中分离得到8个化合物。经物理常数测定及光谱（UV,IR,MS,NMR)分析鉴定其为（1）白鲜碱（dictamning),（2）茵芋碱（skimmianine),(3)滨蒿内酯（scoparone),(4)崖椒内酯（schinifolin),(5)莨菪亭（scopoletin),（6）7-羟基-8-甲氧基香豆素（7-hydroxy-8-methoxycoumarin),（7）N-甲基弗林辛（N-methylflindersine),（8）β-谷甾醇（β-sitosterol),其中化合物（5）、（6）和（7）为首次从该植物中分离。     

The Taxonomy of the Genus Corchoropsis Sieb. et Zucc.

Since its establishment, the genus Corchoropsis Sieb. et Zucc. Has not been well understood. In the present paper, the genus is revised based on examination of herbarium specimens. One species consisting of two varieties is recognized. C. psilocarpa Harms et Loes. is reduced to a variety under C. tomentosa and C. intermedia Nakai, C. tomentosa var. glabrescens Nakai, C. tomentosa f. glabrescens (Nakai) Hara, C. tomentosa var. micropetala Y. T. chang, and C. tomentosa var. tomentosicarpa P. L. Chiu et G. R. Zhong are reduced as synonyms of C. tomentosa var. tomentosa.     

3-Oxoishwarane,a New Sesquiterpenic Ketone from Aristolochia debilis Sieb. et Zucc

3-Oxoishwarane (V), a new sesquiterpenic ketone, and ?^1,10-aristolenone-2 (II) were Isolated from roots of Aristolochia debilis Sieb. et Zucc     

A Study on the Genus Cephalotaxus Sieb. et Zucc.

The genus Cephalotaxus contains a small number of species. It is adequately appreciated as a newly discovered cancerresistant medicament for the alkaloids obtained from its branches leaves and barks are of curative effect. This paper deals with the classificatory revision based on the morphological features, with the reference to the anatomical characters of leaves, types of alkaloids and pollen morphology observed. Two new combinations are proposed, and 4 species and varieties are reduced in the paper. The genus Cephalotaxus is thus suggested to consist of 2 sections and 9 species. The trees occur in East Asia and the north of Indo-China, with 88% found in China where is the distribution centre and refuge of the genus. The genus in discussion is of unique morphological features which are distinctly different from these of Amentotaxus, Cephalotaxaceae, containing a single genus of Cephalotaxus, is closely related to Taxaceae, and therefore the Cephalotaxaceae is best placed in the Taxinieae of Coniferales.     

Gallotannin production in cell cultures ofCornus officinalis Sieb. et Zucc.

Gallotannin mixtures composed of tri-, tetra- and pentagalloylglucoses were produced by callus and suspension cultures ofCornus officinalis Sieb. et Zucc. The content of the main tannin, 1,2,3,6-tetragalloylglucose, was 36 times that of the intact fruits. The other three tannins, 1,2,6-trigalloyl-glucose, 1,2,3,4,6-pentagalloyl-glucose, and 6-digalloyl-1,2,3-trigalloyl-glucose, were isolated and identified with the authentic specimens. The ratios of the amounts among these tannins were not changed much during the culture period, and by the differences in the combination of plant growth regulators in the medium. Tannin production was stimulated by 6-benzyladenine, whereas cell growth required 2,4-dichlorophenoxyacetic acid or 1-naphthaleneacetic acid. Light irradiation appears to have inhibited tannin production in the cell cultures.     

玉铃花的组织培养与快速繁殖

1植物名称玉铃花（Styrax obassia Sieb.et Zucc.）。 2材料类别种子（层积3个月,清水浸泡24h备用）和带腋芽幼嫩茎段。 3培养条件种子萌发培养基：（1）MS;（2）1/2MS。子叶节分化与增殖培养基：（3）MS＋6-BA0.5mg·L-1（单位下同）＋NAA0.3;（4）MS＋6-BA0.5＋NAA0.5;     

Nitrogen Use Efficiency in Growth of Polygonum cuspidatum Sieb. et Zucc

The growth of Polygonum cuspidatum in sand culture was analysedunder varying nutrient conditions. Nitrogen availability influencednitrogen uptake of plants through the uptake rate per unit rootweight rather than the amount of root. In turn, the differentamounts of nitrogen taken up affected plant growth through theireffects on the rate of leaf expansion. Net assimilation rate (NAR) increased with nitrogen contentper unit leaf area (C), but further increase in leaf nitrogencaused diminishing returns of NAR Optimal nitrogen content perunit leaf area (C_opt) to maximize dry-matter production of aleaf could be determined by drawing a tangent from the onginto a curvilinear relation between NAR and C. This optimal contentdivides a nitrogen-limiting range (C < C_opt) from a carbon-limitingone (C> C_opt) along the axis of nitrogen content. Under nitrogenlimitation, efficiency of nitrogen use in dry-matter productioncould increase if the plant had a larger carbon sink. This givesa qualitative explanation to reduced shoot-to-root ratio underlimited availability of nitrogen. Polygonum cuspidatum Sieb. et Zucc, Japanese knotweed, carbon sink, growth analysis, leaf nitrogen, net assimilation rate, nitrogen use efficiency     

野山楂茎化学成分研究

采用硅胶、AB-8大孔树脂和凝胶柱层析方法对野山楂茎化学成分进行分离纯化,并根据理化性质和光谱数据分析鉴定得到9个化合物,分别是:棕榈酸(1)、硬脂酸(2)、β-谷甾醇(3)、槲皮素(4)、芦丁(5)、熊果酸(6),β-胡萝卜甙(7),柠檬酸(8)和儿茶素(9)。除化合物4外,其余均首次从野山楂中分离得到。     

日本栗引种栽培试验研究

报道日本栗在桂林引种栽培研究结果。日本栗筑波、银寄品种种植表现出生长快、长势好、早实、早熟、丰产、粒大、质优等优良性状,是值得大力推广的优良品种。适当密植、幼树整形修剪、合理配植授粉树、加强肥水管理、人工辅助授粉及适时除雄是日本栗获得早实丰产的关健技术措施。     

Steroidal glycosides from the roots of Cynanchum amplexicaule Sieb. et Zucc

Seven new steroidal glycosides (amplexicosides A (4), B (7), C (8), D (9), E (10), F (11), and G (12)), along with six known compounds (cynatratoside A (1), tylophoside A (2), cynatratoside B (3), glaucogenin A (5), glaucoside A (6), and hancoside A (13)) were isolated from the 95% ethanol extract of the roots of Cynanchum amplexicaule (Sieb. et Zucc.). Their structures were determined based on spectral and chemical evidence. Compound 12 has a 14, 15-secopregnane-type skeleton aglycone, which has not been reported in literature.     

超声波辅助提取山茱萸多糖的实验研究

在单因素实验基础上,采用正交设计和方差分析,研究超声时间、提取温度、料液比对山茱萸多糖提取得率的影响,以山茱萸多糖提取得率作为评价指标,筛选出最佳提取条件为:超声波预处理40 min,提取温度80℃,料液比1∶30。在此条件下,山茱萸多糖平均提取得率为5.29%;超声法提取与传统热水醇沉法比较,山茱萸多糖提取得率无显著性差异,但耗能较少,提取效率更高。超声波辅助提取法可作为山茱萸多糖提取的一种有效方法。     

Exine Development in Illicium Religiosum Sieb. et Zucc. (Illiciaceae)

The exine development in Illicium was investigated using transmission electron and field emission scanning electron microscopy. The protectum and procolumellae appear on protruding sites of the microspore cytoplasm in the early tetrad stage. The protectum takes the form of a reticulate pattern with perforations within the callosic wall. After dissolution of the callosic wall, the central part of muri rises to form tectal ridges. The developing tectum, shows an echinate appearance in sectional view and has perforations at both sides around each lumen. There are two kinds of columellae; those forming continuous rings around each lumen and others which are individual rods standing beneath the tectum. The present developmental study in Illicium showed that the initial simple reticulate pattern formed within the callosic wall develops into the complex reticulate exine pattern of the differentiating tectum during the free microspore stage. The tectum has an angular shape with perforations and is supported by the two kinds of columellae.     

Extraorgan freezing in wintering flower buds of Cornus officinalis Sieb. et Zucc.

Abstract. Extraorgan freezing as a mechanism for increasing cold hardiness was shown using flower buds of Cornus officinalis Sieb. et Zucc. Differential thermal analysis (DTA) revealed that florets in flower buds of C. officinalis owed their cold hardiness to deep supercooling and also that slower cooling rates increased the supercooling ability of florets. During slow stepwise cooling (5°C h⁻¹), the water content of florets decreased and that of scales (involucral bracts) increased, which resulted in accumulation of ice within the scales. This was more extensive in early winter and early spring buds than mid-winter ones. Flower buds with silicone oil in the space between florets and scales also showed a similar decrease in water content of florets and an increase in that of scales. This indicated that water migration from the florets to the scales probably took place by way of the peduncles and the receptacle, possibly through their vascular traces, and not directly from the surface of the florets to the ice sink in the form of vapour. Possible mechanisms of extraorgan freezing are postulated along with this finding.     

Growth analysis of the self-thinning stands of Pinus densiflora Sieb. et Zucc

The competition-density (C-D) effect for self-thinning Pinus densiflora Sieb. et Zucc. stands was analyzed. The relationship between biological time and physical time t followed a hyperbolic curve. The coefficients A_t and B included in the reciprocal equation of the C-D effect in self-thinning stands (i.e. 1/w=A_t+B), where w and , respectively, represent the mean stem volume and the realized stand density, were calculated at each time. With increasing , the coefficient A_t increased abruptly up to a maximum value, and then decreased gradually to a constant level, whereas the coefficient B decreased exponentially. The relationship between the realized stand density and the initial stand density _i was confirmed to follow the equation: 1/=1/_i+, where 1/ represents the asymptotic stand density at a given time. The - relationship was represented by the equation: =p(e–1), where p and are constants. The density in the self-thinning stands tended to converge to the same density level after a sufficient lapse of time, irrespective of the difference in initial stand density. The time-trajectory of the mean stem volume and asymptotic stand density on logarithmic coordinates moved gradually toward the self-thinning line with a slope of approximately –3/2, whereas the time-trajectory of the mean stem volume and full stand density moved initially along the self-thinning line with a slope of approximately –3/2, and then changed to move along the maximum yield line with a slope of –1.0.