大理鸢尾和高原鸢尾的花粉形态

大理鸢尾（ＩｒｉｓｄａｌｉｅｎｓｉｓＸＤＤｏｎｇｅｔＹＴＺｈａｏ）是笔者发表的鸢尾植物分类群（董晓东等,１９９７）,因与高原鸢尾（ＩｒｉｓｃｏｌｅｔｉＨｏｋ．ｆ．）相似,国外有学者认为它是高原鸢尾的一个变种（Ｈｅｎｒｙ,１９９５）。为弄清它的...     

Iris Seed Dormancy

Iris embryos were treated in several ways to study the cause of delayed germination. The results of this work indicate that a chemical inhibitor is present in the endosperm and mechanical inhibition of embryo growth also occurs. The mechanical inhibition reduces excised Iris embryo growth to the same extent as does the chemical inhibitor.     

Isoflavones of Iris spuria

A new isoflavone, 5,7-dihydroxy-6,2′-dimethoxyisoflavone, together with iristectorigenin A and iristectorin A were isolated and characterized from the methanol extract of Iris spuria.     

黄射干的异黄酮类成分

从黄射干Ｉｒｉｓｔｅｃｔｏｒｕｍ的甲醇抽提物中分到５个异黄酮：鸢尾黄酮甲素（１）,鸢尾花素（２）,野鸢尾黄酮（３）,鸢尾黄酮（４）,鸢尾黄酮甙（５）。化合物（１）和（２）系首次从黄射干中分到。所有成分经详细光谱分析确定。     

Iris recognition gets results

Positive results are filtering in from the United Arab Emirates (UAE), demonstrating that iris recognition can be a powerful tool to help verify the identity of passengers. This news comes as the technology is rolled out for use as part of the CANPASS — Air programme at Vancouver International Airport.     

Iris sambucina L.

Ohne Zusammenfassung     

Genetic variability of Iris setosa

Genetic variability of Iris setosa Pall. ex Link. was studied by the RAPD method. Plants from three different habitats were compared by 135 loci revealed with eight arbitrary primers. The three plant accessions all exhibited a high level of polymorphism, and each was characterized by different frequencies of polymorphic fragments, which probably reflected the geographic isolation of the analyzed populations. The average level of polymorphism detected was 35%.     

Photosensitivity of the Frog Iris

The absorption of quanta by rhodopsin leads to the contraction of frog iris muscle. The contractions reach a maximum after about 8 sec. in the light. When the light is turned off the irises relax exponentially with a half-time of about 6 sec. Membrane polarization is not necessary for the response but calcium movement and membrane permeability changes probably are. The response is not mediated by acetylcholine or epinephrine. The curves of log It vs. log t for constant response amplitude bend progressively upward away from a unit slope line at short times as larger response criteria are used because (a) light influences tension development over longer times and (b) the higher intensity, shorter duration flashes are less effective.     

Genetic Variability of Iris setosa

Genetic variability of Iris setosa Pall. ex Link. was studied by the RAPD method. Plants from three different habitats were compared by 135 loci revealed with eight arbitrary primers. The three plant accessions all exhibited a high level of polymorphism, and each was characterized by different frequencies of polymorphic fragments, which probably reflected the geographic isolation of the analyzed populations. The average level of polymorphism detected was 35%.     

Isoflavones of two Iris species

Analysis of the methanol extracts of the rhizomes of Iris milesii resulted in the isolation of a new isoflavone, 5,6,7,4′-tetrahydroxy-3′-methoxyisoflavone and that of Iris kumaonensis, iriskumaonin methyl ether, iriskumaonin, irisflorentin, junipegenin-A, irigenin and iridin.     

Iris pigmentation in domestic pigeons

Summary and Conclusions Analysis of the records of iris color in the University of Wisconsin colony reveals that a simple autosomal recessive factor is responsible for the pearl condition as opposed to the normal orange of wild-typeColumba livia. The symboltr for the pearl factor, as proposed byBessmertnaja (1928), will be retained.A very similar color to pearl, but faintly yellow, is shown to accompany the factor for chocolate plumage color.No evidence for linkage oftr with the factorsS, C, oro has been detected.Unlike the chicken iris, the pigeon iris contains no carotenoid pigments. According to chemical tests it also contains no flavines of flavones, and the yellow pigment is not xanthine. The pigment substances are probably melanin-like.Iris color is a poor index of breed relationships in pigeons.Paper from the Department of Genetics, Agricultural Experiment Station, University of Wisconsin, No. 243.     

Alkylated benzoquinones from Iris kumaonensis

Six novel alkylated p-Benzoquinones irisoquin (A-F) (1-2, 4-7) together with a known cytotoxic quinone, irisoquin (3) along with three known isoflavones, tectoregenin, iristectorin and irigenin were isolated from the rhizomes of Iris kumaonensis and characterized. The structures of compounds 1-2, 4-7 were confirmed by extensive spectroscopic analysis, IR, MS, HRMS, GC, GC-MS, 1D (1H, 13C, NOE) and 2D (HMQC and HMBC) NMR and comparison with literature data of known compounds.     

Osmolytes in salinity-stressed Iris hexagona

We characterize the salinity stress response of Iris hexagona, a freshwater species, by measuring three putative osmolytes, betaine, proline, and dimethylsulphonio-propionate (DMSP) in plants after short (3 days) and long-term (4–5 months) exposure to NaCl. HPLC analyses show that untreated control leaves contained 2.1, 0.2 and 3.2 mg g⁻¹ DW of betaine, proline, and DMSP, respectively, and establish the presence of these compounds in the Iridaceae. Within 4 days of salinity stress (200 mM NaCl) betaine, proline and DMSP increased significantly. Among vegetative tissues, the highest level of proline occurred in roots; betaine and DMSP were highest in leaves. Analyses of generative tissue (flowers and flower stalks) after long-term exposure showed the highest levels (>10 mg g⁻¹ DW) of all examined compounds in petals but only proline and betaine increased with salinity. All three substances showed a basipetal gradient in flower stalks. Although the examined compounds responded to salinity, the osmometry of the sap indicated that they comprise less than 10% of the osmotically active solutes. The temporal and spatial changes in the distribution of the analyzed compounds indicate complex responses to salinity.