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1.
Sławomir Borek Iwona Morkunas Wiktoria Ratajczak Lech Ratajczak 《Acta Physiologiae Plantarum》2001,23(2):141-148
The pathways of arginine transformations in organs of yellow lupin (Lupinus luteus L.) cultivated in vitro in the presence and absence of sucrose were investigated. Isolated embryo axes, isolated cotyledons and seeds deprived of
their coat were cultured for 96 h on Heller medium with 60 mM saccharose (the fed variant, +S), without sugar (the starved
variant, −S) and for 72 h without sugar, followed by 24 h in its presence (the transferred variant, −S→+S). Activities of
arginine decarboxylase [EC 4.1.1.19], arginase [EC 3.5.3.1], and urease [EC 3.5.1.5] were assessed in extracts from isolated
embryo axes. They were the highest in the sugar-starved variant. Supplementation of the medium with saccharose resulted in
decrease in enzyme activities. The level of urea was higher (of ca. 20 %) in starved embryos than in embryos grown in the saccharose-containing medium. Moreover, participation of transamination
in arginine catabolism was evidenced. 相似文献
2.
In this study, the effects of inositol addition on expression of the MAL gene encoding maltase and phosphatidylinositol (PI) biosynthesis in Schizosaccharomyces pombe (a naturally inositol-requiring strain) were examined. We found that specific maltase activity was at its maximum when the concentration of added inositol reached 6 μg ml−1 in a synthetic medium containing 2.0% (w/v) glucose. When the concentration of added inositol was 1 μg ml−1 in the medium, repression of MAL gene expression occurred at glucose concentration higher than 0.2% (w/v). However, when S. pombe was cultured in the synthetic medium containing 6 μg ml−1, repression of maltase gene expression occurred only at initial glucose concentration above 1.0% (w/v). More mRNA encoding maltase was detected in the cells grown in the medium with 6 μg ml−1 inositol than in those grown in the same medium with 1 μg ml−1 inositol. These results demonstrate that higher inositol concentrations in the synthetic medium could derepress MAL gene expression in S. pombe. PI content of the yeast cells grown in the synthetic medium with 6 μg ml−1 of inositol was higher than that of the yeast cells grown in the same medium with 1 μg ml−1 of inositol. This means that PI may be involved in the derepression of MAL gene expression in S. pombe. 相似文献
3.
Decolorization of 1:2 metal complex dye Acid blue 193 by a newly isolated fungus, Cladosporium cladosporioides 总被引:1,自引:0,他引:1
M.H. Vijaykumar Y. Veeranagouda K. Neelakanteshwar T.B. Karegoudar 《World journal of microbiology & biotechnology》2006,22(2):157-162
Summary A fungus Cladosporium cladosporioides isolated from coal sample as a decolorizing microorganism. It decolorized five different azo and triphenylmethane dyes like acid blue 193, acid black 210, crystal violet, reactive black B(S) and reactive black BL/LPR both on solid and in liquid broth medium. Culture broth of this fungus decolorized completely 100 mg of acid blue 193 l−1 in 8 days. The extracellular enzyme of Cladosporium cladosporioides decolorized acid blue 193 on repeated addition to a total (out of 700 mg l−1) concentration of 564 mg l−1 within 168 h without significant decline in the activity, showing the resistant property of Cladosporium cladosporioides to a high concentration of the dye. The optimal temperature 40 °C, pH 5.6 and sugar concentration of 4% required for decolorization of acid blue 193. Cladosporium cladosporioides showed manganese peroxidase activity with 41 U l−1, laccase activity with 1413 U l−1 and lignin peroxidase activity was negligible after day 8 of incubation. 相似文献
4.
Effects of sucrose concentration,supporting material and number of air exchanges of the vessel on the growth of in vitro coffee plantlets 总被引:3,自引:0,他引:3
Nguyen Quynh Thi Kozai Toyoki Van Nguyen Uyen 《Plant Cell, Tissue and Organ Culture》1999,58(1):51-57
Growth of coffee (Coffea arabusta) plantlets cultured in vitroas affected by sugar, types of supporting material and number of air exchanges of the vessel was investigated. Single node
cuttings of in vitro coffee plantlets were cultured on half strength MS medium with or without 20 g l−1 sucrose. Two types of supporting material, agar and Florialite, and two levels of air exchange expressed by number of air
exchanges per vessel, 0.2 and 2.3 h−1, were studied. At the end of a 40-day culture period, fresh weight, shoot length, root length and leaf area of plantlets
when cultured on Florialite soaked in sugar-free medium and under the higher number of air exchanges were greater than those
in sugar containing medium. Callus was observed at the shoot base of plantlets grown on agar medium containing sucrose. Photosynthetic
ability of coffee plantlets in vitro was also significantly increased when grown on sugar-free medium with the high number of air exchanges and Florialite as
a supporting material.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
5.
6.
T. Zhang 《In vitro cellular & developmental biology. Plant》2007,43(2):91-94
This study investigated the factors affecting in vitro flowering of Perilla frutescens. The shoots regenerated from cotyledonary and hypocotyl explants cultured on Murashige and Skoog (MS) medium supplemented
with benzyladenine (BA) and indole-3-acetic acid, each at 0.5 mg l−1, were excised and transferred to MS medium containing 30 g l−1 of sucrose, 8.25 g l−1 of ammonium nitrate, and 1.0 mg l−1 of BA. After 40 d of culture, 86.2% of shoots flowered and most of which self-fertilized in vitro and produced mature fruits with viable seeds. These seeds were germinated and plants were grown to maturity and flowered
in soil under greenhouse conditions. The in vitro flowering system reported in this study may facilitate rapid breeding of P. frutescens and offers a model system for studying the physiological mechanism of flowering. 相似文献
7.
An in vitro protocol for efficient plant regeneration has been developed from mature embryo explants of highland barley (Hordeum vulgare L. var. nudum Hk. f.) under endosperm-supported culture. Embryos with (endosperm-supported culture, ES) or without endosperm
(non-endosperm-supported culture, NES) were excised from mature seeds and cultured on MS medium supplemented with various
concentrations of 2,4-D (1–5 mg l−1) for callus induction. The percentage of callus induction from ES explants was significantly (P < 0.05) lower than that from NES. The highest frequency (97.6%) of callus induction was obtained from NES explants on MS
medium containing 3 mg l−1 2,4-D. When the primary calli were maintained at a reduced concentration of 2,4-D (0.5 mg l−1) for 3 weeks, embryogenic calli were formed. The embryogenic calli were then transferred to MS medium supplemented with different
concentrations of BA (1–5 mg l−1) and 500 mg l−1 casein hydrolysate (CH) for shoot regeneration. However, the capacity of plant regeneration from ES explant-derived calli
was significantly (P < 0.05) higher than that from NES. The best response (81.3%) was observed from ES explant-derived calli on MS medium containing
2 mg l−1 BA. Regenerated plantlets with well-developed root systems were transferred to pots where they grew well, attained maturity
and produced fertile seeds. This method could be employed for genetic manipulation studies. 相似文献
8.
Jameel M. Al-Khayri Christine E. Shamblin Edwin J. Anderson 《In vitro cellular & developmental biology. Plant》1996,32(4):227-232
Summary This study was conducted to establish and optimize a regeneration system for adapted U.S. rice genotypes including three commercial
rice cultivars (LaGrue, Katy, and Alan) and two Arkansas breeding lines. Factors evaluated in the study were genotype, sugar
type, and phytohormone concentration. The system consisted of two phases, callus induction and plant regeneration. In the
callus induction phase, mature caryopses were cultured on MS medium containing either 1% sucrose combined with 3% sorbitol
or 4% sucrose alone, and 0.5 to 4 mg·L−1 (2.26 to 18.10 μM) 2,4-D with or without 0.5mg·L−1) (2.32 μM) kinetin. In the plant regeneration phase, callus was transferred to 2,4-D-free MS medium containing 0 or 2 mg·L−1 (9.29 μM) kinetin combined with 0 or 0.1 mg·L−1 (0.54 μM) NAA. Callus induction commenced within a week, independent of the treatments. Callus growth and plant regeneration, however,
were significantly influenced by interactions among experimental factors. Generally, the greatest callus growth and plant
regeneration were obtained with 0.5 mg·L−1 (2.26 μM) 2,4-D and decreased with increasing 2,4-D concentrations. Kinetin enhanced callus growth only when combined with 0.5 mg·L−1 (2.26 μM) 2,4-D, and 4% sucrose. Inducing callus on kinetin-containing medium generally enhanced regeneration capacity in the presence
of sucrose but not with a sucrose/sorbitol combination. Media containing sucrose alone generally supported more callus proliferation,
but the sucrose/sorbitol combination improved regeneration of some cultivars. NAA and kinetin had little effect on regeneration. 相似文献
9.
Hippolyte Kodja Isabelle Robene-Soustrade Jacques Figier 《Acta Physiologiae Plantarum》1997,19(3):359-366
Callus cultures of Tabernaemontana persicariaefolia, (Apocynaceae), an endangered species endemic to the Mascarene Islands, were established from leaf explants on MS medium containing either
5 mg·l−1 2,4-D and 0.5 mg·l−1 BA or 5 mg·l−1 2,4-D, 0.5 mg·l−1 BA and 200 mg·l−1 DFMO. Histological studies showed regenerating nodules resembling globular embryos in calli after 4 weeks on the DFMO medium.
Green shoot formation was achieved by sequential subculture of the induced calli on media with gradually decreasing 2,4-D
concentrations (5→1→0 mg·l−1). Regeneration was greatly stimulated in the presence of DFMO. The first emergence of shoots occured 3 weeks earlier than
in untreated callus cultures. 相似文献
10.
Summary
Dendrobium candidum Wall. Ex Lindl. is an important species used in the formulation of Shih-hu, a Chinese traditional medicine. An efficient
protocol for in vitro propagation of D. candidum using the axenic nodal segments of the shoots, originated from the in vitro germinated seedlings, was developed. The seeds from 120-d-old capsules after pollination were first germinated on half-strength
Murashige and Skoog (MS) basal medium supplemented with 30 g l−1 sucrose. After 4 mo., the seedlings were subcultured on a similar medium supplemented with 1 ml l−1 HYPONeX, 80 g l−1 potato homogenate and 2 g l−1 activated charcoal for further growth. Axenic nodal segments excised from 9-mo.-old seedlings were cultured on the medium
in the presence of 2 mg l−1 benzyladenine (BA) and 0.1 mg l−1 naphthaleneacetic acid (NAA). After 75 d, 73.2% of the explants gave rise to buds/shoots. The elongated shoots were rooted
on the medium containing 0.2 mg l−1 NAA and the plantlets were successfully acclimatized in soil. 相似文献
11.
Summary Plantlets of Capsicum annuum L. ev. Sweet Banana regenerated via somatic embryogenesis from immature zygotic embryos were capable of producing flower,
fruit, and seed when cultured in small tissue culture containers. In vitro floral buds were first formed on plantlets that grew on plantlet development medium [agar-gelled Murashige and Skoog (MS)
basal medium containing 1 mgl−1 (5.3 μM) α-naphthaleneacetic acid (NAA)] in a growth room at 22°C and continuous illumination. However, floral buds rarely developed
further into mature flowers. This problem was overcome using the vented autoclavable plant tissue culture containers. In vitro fruit formation and ripening was observed when liquid half-strength MS basal medium supplemented with 5 μg ml−1 silver thiosulfate, 1 mg l−1 (5.3 μM) NAA, and 3% sucrose was added to the surface of the plantlet development medium. Hand-pollination improved fruit set. Further
research in needed to determine why the pepper seeds formed in vitro failed to germinate. 相似文献
12.
Summary Plant regeneration through direct somatic embryogenesis was achieved from root segments derived from in vitro shoots of Rauvolfia micrantha Hook. f. (Apocynaceae) grown for 6 wk in half-strength Murashige and Skoog (MS) medium with 3% sucrose, 100 mgl−1 myo-inositol, and 0.5 mgl−1 α-naphthaleneacetic acid (NAA). The effects of photoperiod and plant growth regulators (PGRs) in half-strength MS medium
were studied for the rapid and maximum induction of somatic embryos. The characteristic globular or heart-shaped stages of
somatic embryogenesis were not found and cotyledonary stage embryos occasionally appeared without the intervention of callus
in total darkness and 16-h photoperiod. Root segments cultured in the medium containing 0.1 mgl−1 NAA and 0.2 mgl−1 6-benzyladenine (BA) under 16-h photoperiod showed the maximum frequency (39%) of embryogenesis. The frequency of embryo
formation was increased to 63% when they were cultured in medium with 0.1 mgl−1 NAA and 0.2 mgl−1 BA in the dark for 4wk, then grown under the 16-h photoperiod. Explants with developing embryos developed into plants after
transfer to half-strength MS medium supplemented with 0.1 mgl−1 BA and 0.05 mgl−1 NAA. The well-developed plants were hardened and most plants (80%) survived and were phenotypically similar to the mother
plants. 相似文献
13.
Jeffs SA Goriup S Stacey G Yuen CT Holmes H 《Applied microbiology and biotechnology》2006,72(2):279-290
The productivity of stable Chinese hamster ovary cell lines secreting HIV-1 monomeric (IIIB gp120) and oligomeric (UG21 gp140) recombinant envelope glycoproteins was compared in serum-containing (S+), serum-free (S−) and protein-free (P−) culture media. UG21 gp140 expression was greatest in S+ medium, while IIIBgp120 production was lower than gp140 in all three media but highest in S−. UG21 gp140 production was highest in standard 850-cm2 roller bottle cultures in S+ media, peaking after 14 days of incubation, while expression levels in the three media were 0.5 (S+), 0.4 (S−) and 0.2 (P−) mg/l, from which 90, 80 and 12% of gp140, respectively, could be purified by immunoaffinity chromatography. Purified UG21 gp140 from S+ and S− media possessed biological functionality as evidenced by CD4 and monoclonal antibody (Mab) binding. In contrast, UG21 gp140 from P− medium appears to be misfolded and non-functional. Despite the possession of a different N-linked glycan profile, UG21 gp140 from S− media shows very similar CD4 and Mab binding characteristics to S+ UG21 gp140. The relevance of these findings to HIV vaccine development is discussed. 相似文献
14.
Dorota Krzyżanowska Krystyna Górecka Ryszard Górecki Helena Michalik Teresa Glapś 《Acta Physiologiae Plantarum》2000,22(3):284-287
Results of experiments concerning comparison of tomato fruit properties which were collected from plants obtained in three
manners are described. Control plants were received from seeds. Remaining plants were derived in vitro from leaf and shoot fragments on MS medium supplemented with IAA 0.2 mg·l−1 and BA 2 mg·l−1 (Górecka and Krzyżanowska 1991, Górecka et al. 1994) or with Fari’s et al. (1992) method of obtaining plants by decapitation of sterile seedlings and culture on MS medium without hormones. Evaluation
of physical and chemical fruit characters was performed. In the spring experiment the biggest diameter (72 mm), weight (154
g) and volumne (151 ml) were characterized to fruits from plants obtained in vitro on MS medium with IAA and BA. Also fruits from plants received by Fari’s methods were significantly superior in these characters
over fruits from the control plants. The fruits from the plants obtained in vitro on MS medium with IAA and BA had highest sugar content (2.95 % f.wt.) and fruits from in vitro plants after Fari’s method contained highest vit.C-13.4 mg·100 g−1 f.wt (significant differences in comparison to control fruits). In other characters fruits from in vitro did not differ as compared to control ones. In the autumn experiments significant differences among fruit groups and characters
evaluated were not stated. Generally, yield quality was poorer in the all autumn treatments. 相似文献
15.
J. Vijaya Kumar B. D. Ranjitha Kumari G. Sujatha Enrique Castaño 《Plant Cell, Tissue and Organ Culture》2008,93(1):85-96
The present study describes a system for efficient plant regeneration via organogenesis and somatic embryogenesis of safflower
(Carthamus
tinctorius L.) cv. NARI-6 in fungal culture filtrates (FCF)-treated cultures. FCF was prepared by culturing Alternaria carthami fungal mycelia in selection medium for host-specific toxin production. Cotyledon explants cultured on callus induction medium
with different levels of FCF (10–50%) produced embryogenic callus. In organogenesis, 42.2% microshoots formed directly from
embryogenic callus tissues in plant regeneration medium with 40% FCF. Isolated embryogenic callus cultured on embryo induction
medium containing 40% FCF induced 50.2% somatic embryogenesis. Embryo germination percentage was decreased from 64.5 to 28
in embryo maturation medium containing 40% FCF. However, nine plantlets from organogenesis and 24 plantlets from somatic embryogenesis
were selected as FCF-tolerant. Alternaria carthami fungal spores (5 × 105 spores/ml) sprayed on the leaves of FCF-tolerant plants showed enhanced survival rate over control plants, which plants were
more susceptible to fungal attack. The number of leaf spot lesions per leaf was decreased from 3.4 to 0.9 and their lesion
length was also reduced from 2.9 to 0.7 mm in organogenic derived FCF-tolerant plants over control. In somatic embryo derived
FCF-tolerant plants, the number of lesions was decreased from 3.1 to 0.4 and the lesion size was also reduced to 2.7–0.5 mm
when compared to the control. This study also examined antioxidant enzyme activity in FCF-tolerant plants. Catalase (CAT)
activity was slightly decreased whereas peroxidase (POD) activity was increased to a maximum of 42% (0.19 μmol min−1 mg−1 protein) from organogenesis and 47% (0.23 μmol min−1 mg−1 protein) from embryogenesis in FCF-tolerant plants. Superoxide dismutase (SOD) activity was also increased to 17% (149 U
mg−1 protein) and 19.5% (145 U mg−1 protein) in FCF-tolerant plants derived from organogenesis and somatic embryogenesis when compared with control plants. 相似文献
16.
Establishment of in vitro plants, cell and tissue cultures from Oldenlandia affinis for the production of cyclic peptides 总被引:1,自引:1,他引:0
In vitro cultured plants from Oldenlandia affinis were established from seeds and grown on a hormone-free medium. In vitro plants produced the cyclic peptide kalata B1 in concentrations of 0.67 mg g−1 dry weight after growth of 30 days. This was approximately 50% of the concentration analysed in green house plants (shoot tips), where different concentrations have been determined in leaves (1.82 mg g−1), shoot tips (1.36 mg g−1), stems (0.36 mg g−1), and in flowers (0.16 mg g−1). Callus and cell suspension cultures could be initiated from aseptic root, stem and leaf explants of O. affinis seedlings and plants. Different light intensities were shown to affect culture growth as well as chlorophyll synthesis. The friable callus was then used for the establishment of a cell suspension culture. Fresh and dry weight measurements showed that growth was optimal on MS medium supplemented with 0.4 mg l−1 2,4-dichlorophenoxyacetic acid (2,4-d). Leaf suspensions cultured on this medium showed a 4-fold increase of biomass by the first week of incubation. No quantifiable amounts of kalata B1 were produced under these conditions. Morphological differentiation seems to be essential for cyclic peptide production. Therefore, several undifferentiated as well as organised cell lines of O. affinis have been developed. These cell lines will constitute a worthwhile starting point for the optimisation of kalata B1 synthesis in liquid media to the objective of producing cyclic peptides under controlled and defined conditions in bioreactors. 相似文献
17.
The Perilla (Perilla frutescens L. cv. Okdong) oleosin gene, PfOle19, produces a 19-kDa protein that is highly expressed only in seeds. The activity of the −2,015 bp 5′-upstream promoter region
of this gene was investigated in transgenic Arabidopsis plants using the fusion reporter constructs of enhanced green fluorescent protein (EGFP) and β-glucuronidase (GUS). The PfOle19 promoter directs Egfp expression in developing siliques, but not in leaves, stems or roots. In the transgenic Arabidopsis, EGFP fluorescence and histochemical GUS staining were restricted to early seedlings, indehiscent siliques and mature seeds.
Progressive 5′-deletions up to the −963 bp position of the PfOle19 promoter increases the spatial control of the gene expression in seeds, but reduces its quantitative levels of expression.
Moreover, the activity of the PfOle19 promoter in mature seeds is 4- and 5-fold greater than that of the cauliflower mosaic virus 35S promoter in terms of both
EGFP intensity and fluorometric GUS activity, respectively. 相似文献
18.
Abscisic acid and osmotic induction of synchronous somatic embryo development of sweet potato 总被引:1,自引:0,他引:1
Antonio C. Torres Nicolas Mfe'e Ze Daniel J. Cantliffe 《In vitro cellular & developmental biology. Plant》2001,37(2):262-267
Summary Somatic embryos of sweet potato have potential as synthetic seeds. The effects of abscisic acid (ABA) (0,0,0.1, 1.0, 10.0
and 50.0 μM) were examined to improve synchrony and proliferation of somatic embryos. Transferring embryos compared to those cultures
transferred at day 0. The development of embryos in suspension culture supplemented with ABA was poor. However, when calli
proliferation cultures were in gelled medium and pulsed with 0.1 μM ABA for 14 d, the number of somatic embryos increased. Proembryonic masses cultured in mannitol-containing medium (Y=−1.5
MPa) increased embryo development and synchrony of embryo development. Thus, in this work ABA and mannitol have been shown
to improve both the total number and the synchrony of sweet potato somatic embryos. 相似文献
19.
Marta Medina Nieves Villalobos Pedro J. de la Cruz Ana Dorado Hilario Guerra 《Acta Physiologiae Plantarum》1999,21(2):141-147
The different acid invertase activity (total, soluble, wall-bound and extracellular) in calli induced on explants (cotyledon,
petiole, hypocotyl and leaf) originated from Medicago strasseri seedlings were evaluated. In cultures subjected to 16 h photoperiod, the highest total, soluble and extracellular activities
were found in calli from leaves cultured in medium 12 (MS with 0.01 mg·dm−3 (0.045 μM) of TDZ), elevated amounts of total and wall-bound invertase being found in calli induced on petioles in 12G medium
(MS with 0.01 mg·dm−3 (0.045 μM) TDZ and 3.104 mg·dm−3 glycerol). In cultures maintained in darkness, the activity detected was lower than that observed in cultures under light
conditions. The highest amounts of enzyme was bound in calli cultured on medium 12 (total and extracellular invertase) -leaves-
and medium 12D (MS with 0.001 mg·dm−3 (0.0045 μM) TDZ) (soluble invertase) -using hypocotyls. In general, the different forms of invertase activity studied seem
to appear in greatest amounts in calli induced under light conditions using leaves as explant and TDZ as growth regulator. 相似文献
20.
Summary High-frequency embryogenesis systems were established for hybrid yellow-poplar (Liriodendron tulipifera×L. chinense) and hybrid sweetgum (Liquidambar styraciflua×L. formosana) by modifying a medium originally developed for embryogenic yellow-poplar cultures. Embryogenic cultures of both hybrids,
consisting of proembryogenic masses (PEMs), were initiated from immature hybrid seeds on an induction-maintenance medium (IMM)
supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D), benzyladenine (BA), and casein hydrolyzate (CH). For hybrid yellow-poplar,
as many as 2100 germinable somatic embryos per 4000 cells or cell clumps were produced when PEMs were grown in liquid IMM
lacking CH, at a pH that varied with genotype (3.5 or 5.6), followed by size fractionation and plating on semisolid embryo
development medium (DM; IMM lacking 2,4-D and BA) without CH, but supplemented with 4.0 mgl−1 (15 μM) abscisic acid. For hybrid sweetgum, up to 1650 germinable somatic embryos per 4000 cells or cell clumps were produced when
PEMs were grown in liquid IMM without CH, but with 550 mgl−1
l-glutamine, 510 mg l−1 asparagine, and 170 mg l−1 arginine at pH 5.6. Somatic embryos developed from cell clumps on DM without any plant growth regulators or other supplements.
Hundreds of somatic embryos of both hybrids were germinated on DM without CH, transferred to potting mix, and hardened off
in a humidifying chamber for transfer to the greenhouse. 相似文献