Light promotes the synthesis of lignin through the production of H2O2 mediated by diamine oxidases in soybean hypocotyls

Guo-xing, SU; An, Zhenfeng; Zhang, Wenhua; Youliang, Liu

doi:10.1016/j.jplph.2005.04.033

Cited by 105 publications

(54 citation statements)

References 21 publications

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“…An inverse relationship between peroxidase activity and concentration of endogenous PUT was observed when AG was added during rooting induction; these results might be associated to the hydrogen peroxide formation during the action of the PUT catabolism (Hausman et al 1995a;Tonon et al 2001;Guoxing et al 2005).…”

Section: Discussionmentioning

confidence: 91%

Involvement of polyamines in the adventitious rooting of micropropagated shoots of the apple rootstock MM106

Naija

Elloumi²,

Ammar

et al. 2008

In Vitro Cell.Dev.Biol.-Plant

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Apple rootstock MM106 shoots, raised in vitro, rooted at 96.7% after culture on a medium supplemented with an auxin for 5 d in darkness followed by culture on a second medium without growth regulators for 25 d in light. In control conditions (in absence of auxin in the first medium), these shoots did not root. Putrescine (PUT), spermidine (SPD), cyclohexylamine (CHA), and aminoguanidine (AG) enhanced rooting when applied during the first d of culture in the absence of IBA; on the contrary, α-difluoromethylornithine (DFMO) added to the first medium with IBA inhibited rooting. The endogenous levels of indole 3-acetic acid (IAA) and indole 3-acetylaspartic acid (IAAsp) increased up to a maximum concentration at days 2 and 3, respectively, in initial rooting conditions. PUT, when added with IBA, did not affect the typical IAA and IAAsp increase; when applied alone, it provoked an increase of their levels. Similar results were recorded with CHA. SPD, AG, and DFMO did not induce an increase of IAA and IAAsp in nonrooting conditions. The levels of endogenous PUT increased to a maximum at day 2 in rooting conditions; it was slightly affected by exogenous PUT and CHA application but reduced by SPD, AG, and DFMO. In rooting conditions, if the first medium was supplemented with SPD or AG, a small increase in peroxidase activity was observed, similar to that obtained with PUT treatment. The present work indicates an involvement of polyamines in the control of rooting and an interaction with auxins during the physiological phase of rooting. The consequence of this relationship was a different rooting expression, according especially to the content of these regulators in the culture medium.

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Section: Discussionmentioning

confidence: 91%

Involvement of polyamines in the adventitious rooting of micropropagated shoots of the apple rootstock MM106

Naija

Elloumi²,

Ammar

et al. 2008

In Vitro Cell.Dev.Biol.-Plant

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“…Diamine oxidase (DAO) and polyamine oxidase (PAO) activities were determined by measuring H 2 O 2 production, as described by Su et al (2005), with few modifications. The plant material (700 mg) was homogenized in 100 mM potassium phosphate buffer (pH 6.5); the homogenate was centrifuged at 10,000g for 20 min at 4°C and the supernatant used for the assays.…”

Section: Measurements Of Proline Glycine Betaine and C-aminobutyricmentioning

confidence: 99%

Roles of some nitrogenous compounds protectors in the resistance to zinc toxicity in Lactuca sativa cv. Phillipus and Brassica oleracea cv. Bronco

et al. 2015

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Roles of some nitrogenous compounds protectors in the resistance to zinc toxicity in Lactuca sativa cv. Phillipus and Brassica oleracea cv. Bronco Abstract Zinc (Zn) pollution in the soil represents a major problem for crop production worldwide. In the present work, two horticultural plants exhibiting different tolerance to Zn, Lactuca sativa cv. Phillipus and Brassica oleracea cv. Bronco, were exposed to Zn to evaluate the contribution of compatible osmolytes such as proline (Pro), glycine betaine (GB) and c-aminobutyric acid (GABA) in the mechanism(s) of tolerance to Zn stress. This study confirms the higher susceptibility of L. sativa to Zn stress: lettuce plants experienced a strong reduction in biomass, while the levels of Pro and GB increased. These results suggest that in L. sativa, the increase of Pro and GB does not represent a mechanism of resistance to toxicity, but it is likely a symptom of Zn stress. Conversely, in B. oleracea, a slight decrease in Pro levels, mainly catalysed by degradation through proline dehydrogenase, was observed; a similar behaviour affected GB levels. On the other hand, GABA synthesis was slightly, but significantly, increased. The presence of high levels of GABA in Zn-stressed B. oleracea would suggest that reactive oxygen species detoxification could be essential to improve the resistance to toxicity under metal stress conditions.

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“…Assay of diamine and polyamine oxidase activity DAO and PAO activity were determined by measuring the generation of H 2 O 2 , a product of the oxidation of polyamines, as described by Su et al (2005), with some modifications. Fresh samples were homogenized in 100 mM potassium phosphate buffer (pH 6.5).…”

Section: Assay Of Polyamine Biosynthetic Enzyme Activitymentioning

confidence: 99%

Exogenous spermidine affects polyamine metabolism in salinity-stressed Cucumis sativus roots and enhances short-term salinity tolerance

JiuJu

Guo

et al. 2008

Journal of Plant Physiology

337

169

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Light promotes the synthesis of lignin through the production of H2O2 mediated by diamine oxidases in soybean hypocotyls

Cited by 105 publications

References 21 publications

Involvement of polyamines in the adventitious rooting of micropropagated shoots of the apple rootstock MM106

Involvement of polyamines in the adventitious rooting of micropropagated shoots of the apple rootstock MM106

Roles of some nitrogenous compounds protectors in the resistance to zinc toxicity in Lactuca sativa cv. Phillipus and Brassica oleracea cv. Bronco

Exogenous spermidine affects polyamine metabolism in salinity-stressed Cucumis sativus roots and enhances short-term salinity tolerance

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