Effects of synthetic cytokinins on levels of endogenous cytokinins and respiration patterns ofBeta vulgaris cells in suspension

Vaňková, Radomı́ra; Hsiao, Ke‐Cheng; Bornman, Chris H.; Gaudinová, Alena

doi:10.1007/bf02279334

Cited by 39 publications

(12 citation statements)

References 15 publications

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“…In other words, amount of juvenile wood of 4 year old Poplar was more than 12 year old. This finding has been already approved by other researchers (11,13,23). …”

Section: -Resultssupporting

confidence: 83%

“…(Bullmark,Kubat,1988). It is possible that BAP is more effective than Kin in switching on endogenous cytokinin production (Vankova 1991). 259 With E.grandis, the nodal explants from juvenile as well as adult trees responded alike to shoot induction, how ever shoots induced from juvenile material were more amenable to rooting than those from mature trees.…”

Section: Discussionmentioning

confidence: 99%

“…It can be noted in this case that by increasing resin content, number of joint point was increased. Therefore strength properties of boards were improved [10,11,13,24]. Although effect of press time is not significant on bending properties but maximum of these properties were obtained at 5 minutes.…”

Section: -1-physical and Mechanical Properties Of Fiberboardsmentioning

confidence: 99%

“…Thickness swelling after 2 and 24 hours was decreased by increasing of resin content. This is probably due to increasing joint points between fibers and increasing of connection strength [10,11,13,23]. Minimum of thickness swelling was observed in 11% resin content.…”

Section: -1-physical and Mechanical Properties Of Fiberboardsmentioning

confidence: 99%

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Review of forests, wood products and wood biotechnology of Iran and Germany - Part III

2009

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“…In other words, amount of juvenile wood of 4 year old Poplar was more than 12 year old. This finding has been already approved by other researchers (11,13,23). …”

Section: -Resultssupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: -1-physical and Mechanical Properties Of Fiberboardsmentioning

confidence: 99%

Section: -1-physical and Mechanical Properties Of Fiberboardsmentioning

confidence: 99%

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Review of forests, wood products and wood biotechnology of Iran and Germany - Part III

2009

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“…CKs were determined by a combined HPLC-ELISA method [26]. The callus was homogenised and extracted with 80% (v/v) methanol, anionic substances were removed from the supematant on DEAE-cellulose column, CK bases and ribosides were absorbed on phosphocellulose, eluted with 1 M NHdOH and adsorbed on a Sep-Pak Si Cis cartridge.…”

Section: Estimation Of Endogenous Levels Of Iaa and Ckmentioning

confidence: 99%

Different effects of two brassinosteroids on growth, auxin and cytokinin content in tobacco callus tissue

et al. 1995

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Two synthetic brassinosteroids, 24-epibrassinolide (24-epiBR) and 2o,3a,l7P-trihydroxy-5cu-androstan-6-one (THA-BR), exhibit different effects on growth of tobacco callus tissue. When added to a culture medium containing growth-limiting amounts of auxin, 24-epiBR reduced and THA-BR increased the fresh weight yield of tissue up to 53% and 207%, respectively, after 6 weeks of cultivation. The stimulatory and inhibitory effects of the two brassinosteroids on tissue growth occurred over a broad range of concentrations without a pronounced maximum corresponding to the 'yes or no' type of response. Different effects of 24-epiBR and THA-BR on tissue growth were inversely proportional to the content of endogenous cytokinins. Maximum contents of predominant cytokinins N6-(A=-isopentenyl)adenine (iP) and trans-zeatin (Z) in tissues supplied with 24-epiBR in growth-inhibiting concentrations were up to 3.7 fold and 3.4 fold higher, respectively, as compared to tissues grown on media containing growth-stimulating concentrations of THA-BR. Stimulation of tissue growth by THA-BR correlated with content of endogenous IAA and an inverse correlation was found between the content of endogenous IAA and cytokinins in tissues supplied with 24-epiBR. THA-BR exhibited weak cytokinin-like activity in a bioassay based on stimulation of growth of lateral buds of pea while 24-epiBR was inactive. Results indicate that the qualitatively different effects of the two brassinosteroids on growth of tobacco tissue may reflect their different influence on content of endogenous cytokinin.Abbreviations: BR(s) = brassinosteroid(s); 24-epiBR = 24-epibrassinolide; THA-BR = 2a,3a,l7/3-trihydroxy-5cu-androstan-6-one; CK(s) = cytokinin(s); iP = N6-(A=-isopentenyl)adenine; [9R]iP = N6-(A=-isopentenyl)adenosine; Z = trans-zeatin, [9R]Z = ribosyl-trans-zeatin; ABA = abscisic acid; IAA = indole-3-acetic acid; NAA = naphtalene-1 -acetic acid; DEAE cellulose = diethylaminoethyl cellulose; HPLC = high performance liquid chromatography; ELISA = enzyme linked immuno-sorbent assay

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Endogenous cytokinins as biochemical markers of rubber-tree (Hevea brasiliensis) clone rejuvenation

Perrin

Doumas²,

Lardets

et al. 1997

Plant Cell Tiss Organ Cult

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E n d o g e n o u s cytokinins as biochemical m a r k e r s of rubber-tree (Hevea brasiliensis) clone rejuvenation AbstractThe endogenous levels of isopentenyladenine, isopentenyladenosine, zeatin and zeatin riboside and the ability for in vitro axillary shoot organogenesis and rhizogenesis were compared between mature and rejuvenated clones of Hevea brasiliensis (Mtill. Arg.). Enhancement of the in vitro organogenesis ability of rubber-tree clones following somatic embryogenesis or repeated grafting onto juvenile rootstocks was accompanied by an increase of zeatin riboside levels in shoots used as starting material for in vitro micropropagation. Furthermore, the zeatin level, in in vitro shoots of clones treated by in vitro micrografting, and consequently capable of axillary shoot and root organogenesis, was higher than in in vitro shoots of non treated mature material incapable of in vitro organogenesis. We conclude that the endogenous zeatin-like cytokinin level (free and ribosylated forms) can be considered as a reliable marker for the recovery of in vitro shoot and root organogenesis after rejuvenating treatments in rubber-tree clones.Abbreviations: ZR -zeatin riboside; 2iP -isopentenyladenine; iPA -isopentenyladenosine; NAA -c~naphthaleneacetic acid; BA -6-benzyladenine; IBA -indole-3-butyric acid

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Effects of synthetic cytokinins on levels of endogenous cytokinins and respiration patterns ofBeta vulgaris cells in suspension

Abstract: Abstract. Respiration patterns and growth of cytokinin-dependent cell suspensions of Beta vulgaris

Cited by 39 publications

References 15 publications

Review of forests, wood products and wood biotechnology of Iran and Germany - Part III

Review of forests, wood products and wood biotechnology of Iran and Germany - Part III

Different effects of two brassinosteroids on growth, auxin and cytokinin content in tobacco callus tissue

Endogenous cytokinins as biochemical markers of rubber-tree (Hevea brasiliensis) clone rejuvenation

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