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植物激素和精胺对文竹组织培养生根的影响(简报) 总被引:2,自引:0,他引:2
文竹组织培养的生根需要IBA和适量KT,添加NAA和精胺也有利于生根。NAA预处理明显促进生根,培养基中无机盐和水解乳蛋白的量以低为宜。地上部的生长状况明显影响生根,生长适中的对生根有利。 相似文献
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以黑莓(Rubus spp. )品种'Chester'带腋芽茎段为外植体,对初代培养基、不定芽增殖培养基和生根培养基中适宜的激素种类及浓度进行了筛选,并对增殖培养过程中适宜的光照度进行了研究.结果显示,在初代培养基中添加不同质量浓度的6-BA和NAA对侧芽的萌发和生长有明显的影响,其中,NAA不利于芽的萌发和生长,而添加适量的6-BA可促进芽的萌发和生长;适宜于'Chester'茎段的初代培养基为添加了1.00 mg·L-16-BA的MS培养基(含25 g·L-1蔗糖和5.9 g·L-1琼脂,pH 5.8).单因素实验结果显示,在 'Chester'不定芽的增殖过程中,细胞分裂素主要影响不定芽增殖,而生长素主要影响不定芽生长,以质量浓度低于1.0 mg·L-1的6-BA以及质量浓度低于0.3 mg·L-1的NAA较为适宜;经过进一步的组合筛选,确定适宜于'Chester'不定芽增殖的培养基为添加了0.5 mg·L-16-BA和0.1 mg·L-1NAA的MS培养基(含25 g·L-1蔗糖和5.9 g·L-1琼脂,pH 5.8).在生根培养基中添加高浓度NAA易诱导不定芽基部产生愈伤组织,不利于不定芽生根,因而,'Chester'不定芽适宜的生根培养基为添加了0.10 mg·L-1NAA的1/2MS培养基(含20 g·L-1蔗糖和5.9 g·L-1琼脂,pH 5.8).在不定芽的增殖培养过程中,光照度较强有利于不定芽生长,适宜的增殖培养条件为:光照度3 000 lx、光照时间15 h·d-1、温度(25±2) ℃、相对湿度约70%,此条件下不定芽的增殖系数(1.95)和平均芽长(1.44 cm)最高,芽生长状况良好. 相似文献
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本文首次报道裂叶悬钩子(Rubus laciniatus Wild)叶外植体培养在改良的NN~(69)培养基上附加2—4mg/1 6-BA和0.1mg/1 NAA或1—3mg/1 2,4-D和0.1mg/1 NAA,两者都可直接从完整叶片、叶片下切段或叶柄诱导出不定芽。诱导频率达20—48%。而不定芽绝大部分发生在叶轴处或叶柄基部。完整叶片的不定芽诱导率与叶片下切段无差别,但比叶柄基部诱导率要高。6-BA对叶轴处不定芽诱导率比2,4-D的要高。此外,不需继代培养,不定芽数可达10—20个,继代培养一个月左右,每个不定芽能形成丛生芽数可达40一60个。另外,本文还讨论了细胞分化过程中的极性现象。 相似文献
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植物细胞的遗传全能性与组织培养形态发生控制 总被引:7,自引:0,他引:7
引言自1902年德国植物学家Haberlandt提出植物的单个细胞可能具有分化的全能性的理论以来,人们才开始从事植物组织培养,以致今天广泛用来有意识地定向控制遗传变异和人工创造植物新类型的研究。到今据不完全统计,全世界约有1000种高等植物作过离体培养尝试。根据大量实验结果证明,植物单个细胞具有遗传的全能性, 相似文献
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《Inorganica chimica acta》1986,117(2):187-189
The isolation and characterization of nine polymeric complexes of the general formula [M(L)1.5S2]n (where M is the metal ion, L the ligand and S the solvent, C2H5OH) of La(III) and Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III), Ho(III) with.the biologically active compound embelin using elemental and thermal analysis, infrared and electronic spectral studies is reported. 相似文献
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A unique multibranched cyclomaltooligosaccharide (cyclodextrin, CD) of 6(1),6(3),6(5)-tri-O-alpha-maltosyl-cyclomaltoheptaose [6(1),6(3),6(5)-tri-O-alpha-maltosyl-beta-cyclodextrin, (G(2))(3)-betaCD] was prepared. The physicochemical and biological properties of (G(2))(3)-betaCD were determined together with those of monobranched CDs (6-O-alpha-D-glucopyranosyl-alpha-cyclodextrin (G(1)-alphaCD), 6-O-alpha-D-glucopyranosyl-beta-cyclodextrin (G(1)-betaCD), and 6-O-alpha-maltosyl-beta-cyclodextrin (G(2)-betaCD)). NMR spectra of (G(2))(3)-betaCD were measured using various 2D NMR techniques. The solubility of (G(2))(3)-betaCD in water and MeOH-water solutions was extremely high in comparison with nonbranched betaCD and was about the same as that of the other monobranched betaCDs. The formation of an inclusion complex of (G(2))(3)-betaCD with stereoisomers (estradiol, retinoic acid, quinine, citral, and glycyrrhetinic acid) depends on the cis-trans isomers of guest compounds. The cis isomers of estradiol, retinoic acid, and glycyrrhetinic acid were included more than their trans isomers, while the trans isomers of citral and quinine fit more tightly than their cis isomers. (G(2))(3)-betaCD was the most effective host compound in the cis-trans resolution of glycyrrhetinic acid. Among the branched betaCDs, (G(2))(3)-betaCD exhibited the weakest hemolytic activity in human erythrocytes and showed negligible cytotoxicity in Caco-2 cells up to 200 microM. These results indicate unique characteristics of (G(2))(3)-betaCD in some biological responses of cultured cells. 相似文献
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《Inorganica chimica acta》1988,149(2):177-185
CpRuCl(PPh3)2 reacted with excess R-DAB in refluxing toluene to give CpRuCl(R-DAB(4e)) (1a: R = i-Pr; 1b: R = t-Bu; 1c: R = neo-Pent; 1d: R =p-Tol). 1H NMR and 13C NMR spectroscopic data indicated that in these complexes the R-DAB ligand is bonded in a chelating 4e coordination mode.Reaction of 1a and 1b with one equivalent of [Co(CO)4]− afforded CpRuCo(CO)3(R-DAB(6e)) (2a: R = i-Pr; 2b: R = t-Bu). The structure of 2b was determined by a single crystal X-ray structure determination. Crystals of 2b are monoclinic, space group P21/n, with four molecules in a unit cell of dimensions: a = 16.812(4), b = 12.233(3), c = 9.938(3) Å and β = 105.47(3)°. The structure was solved via the heavy atom method and refined to R = 0.060 and Rw = 0.065 for the 3706 observed reflections. The molecule contains a RuCo bond of 2.660(3) Å and a cyclopentadienyl group that is η5-coordinated to ruthenium [RuC(cyclopentadienyl) = 2.208(3) Å (mean)]. Two carbonyls are terminally coordinated to cobalt (CoC(1) = 1.746(7) and CoC(2) = 1.715(6) Å) while the third is slightly asymmetrically bridging the RuCo bond (RuC(3) = 2.025(6) and CoC(3) = 1.912(6) Å). The RuC(3)O(3) and CoC(3)O(3) angles are 138.4(5)° and 136.5(5)°, respectively. The t-Bu-DAB ligand is in the bridging 6e coordination mode: σ-N coordinated to Ru (RuN(2) = 2.125(4) Å), μ2-N′ bridging the RuCo bond and η2-CN coordinated to Co (RuN(1) = 2.113(5), CoN(1) = 1.941(4) and CoC(4) = 2.084(5) Å). The η2-CN′ bonded imine group has a bond length of 1.394(7) Å indicating substantial π-backbonding from Co into the anti-bonding orbital of this CN bond.1H NMR spectroscopy indicated that 2a and 2b are fluxional on the NMR time scale. The fluxionality of 6e bonded R-DAB ligands is rarely observed and may be explained by the reversible interchange of the σ-N and η2-CN′ coordinated imine parts of the R-DAB ligand. 相似文献
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Chandrasekaran R Giacometti A Arnott S 《Journal of biomolecular structure & dynamics》2000,17(6):1023-1034
The molecular structure of poly (U).poly (A).poly (U) has been determined and refined using the continuous x-ray intensity data on layer lines in the diffraction pattern obtained from an oriented fiber of the RNA. The final R-value for the preferred structure is 0.24, far lower than that for the plausible alternatives. The polymer forms an 11-fold right-handed triple-helix of pitch 33.5A and each base triplet is stabilized by Crick-Watson-Hoogsteen hydrogen bonds. The ribose rings in the three strands have C3'-endo, C2'-endo and C2'-endo conformations, respectively. The helix derives additional stability through systematic interchain hydrogen bonds involving ribose hydroxyls and uracil bases. The relatively grooveless cylindrical shape of the triple-helix is consistent with the lack of lateral organization. 相似文献
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Chandrasekaran R Giacometti A Arnott S 《Journal of biomolecular structure & dynamics》2000,17(6):1035-1045
The molecular structure of poly (I).poly (A).poly (I) has been determined and refined using the continuous intensity data on layer lines in the x-ray diffraction pattern obtained from an oriented fiber of this polymorphic RNA complex. The polymer forms a 12-fold right-handed triple-helix of pitch 39.7A and each base-triplet is stabilized by quasi Crick-Watson-Hoogsteen hydrogen bonds. The ribose rings in all the three strands have C3'-endo conformations. The final R-value for this best structure is 0.24 and the x-ray fit is significantly superior to all the alternative structures where the different chains might have different furanose conformations. This all-purine triple-helix, counter-intuitively, has a diameter roughly 3A shorter than that of DNA and RNA triple-helices containing a homopurine and two complementary homopyrimidine strands. Its compact, grooveless cylindrical shape is consistent with the lack of lateral organization. 相似文献
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Summary The serum groups Gm(1) [Gm(a)], Gm(2) [Gm(x)], Gm(4) [Gm(f)]. Gm(12) [Gm(b)] and Inv(1) [Inv(1)] of 2000 sera of healthy blood donors from the land Hesse were examined. The results obtained were compared with those known until now. Three persons, not related to each other, possessed the extremely rare phenotype Gm(-1, 2, 4, 12) [Gm (a-x+b+f+)]. In 0.75% of the cases we found a discordant behaviour of the factors Gm(4) and Gm(12) [Gm(f) and Gm(b)].
Director: Prof. Dr. W. Wachsmuth
Director: Prof. Dr. W. Spielmann
The nomenclature suggested by WHO at a round-table conference over genes, genotypes and allotypes of immunglobulins is used. The conference took place in Geneva on the 1965 31. 5. to the 5. 6. [5].
With technical assistance of S. Mohs. 相似文献
Zusammenfassung 2000 Seren von gesunden Blutspendern aus Hessen wurden bezüglich der Gamma-Globulin-Serumgruppen Gm(1) [Gm(a)], Gm(2) [Gm(x)], Gm(4) [Gm(f)]. Gm(12) [Gm(b)] und Inv(1) [Inv(1)] untersucht. Die gefundenen Resultate wurden mit den bisher bekannten verglichen. Drei miteinander nicht verwandte Personen wiesen den äußerst seltenen Phänotyp Gm(-1, 2, 4, 12) [Gm(a-x+b+f+)] auf. In 0.75% der Fälle fanden wir ein diskordantes Verhalten der Faktoren Gm(4) und Gm(12) [Gm(f) und Gm(b)].
Director: Prof. Dr. W. Wachsmuth
Director: Prof. Dr. W. Spielmann
The nomenclature suggested by WHO at a round-table conference over genes, genotypes and allotypes of immunglobulins is used. The conference took place in Geneva on the 1965 31. 5. to the 5. 6. [5].
With technical assistance of S. Mohs. 相似文献
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Chandrasekaran R Giacometti A Arnott S 《Journal of biomolecular structure & dynamics》2000,17(6):1011-1022
The molecular structure of poly (dT).poly (dA).poly (dT) has been determined and refined using the continuous x-ray intensity data on layer lines in the diffraction pattern obtained from an oriented fiber of the DNA. The final R-value for the preferred structure is 0.29 significantly lower than that for plausible alternatives. The molecule forms a 12-fold right-handed triple-helix of pitch 38.4 A and each base triplet is stabilized by a set of four Crick-Watson-Hoogsteen hydrogen bonds. The deoxyribose rings in all the three strands have C2'-endo conformations. The grooveless cylindrical shape of the triple-helix is consistent with the lack of lateral organization in the fiber. 相似文献