Modulation of SAMDC expression in <i>Arabidopsis thaliana</i> alters in vitro shoot organogenesis

Hu, Wenwei; Gong, Haibiao; Pua, Eng Chong

doi:10.1111/j.1399-3054.2006.00799.x

Cited by 39 publications

(27 citation statements)

References 42 publications

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“…Application of Spd, Spm, or AVG, significantly increased free-Spd and free-Spm concentrations in grains, whereas significantly reduced ACC concentration and ethylene evolution rate, and the results were reversed when MGBG, ethephon, or ACC was applied, implying that PAs (Spd and Spm) and ethylene exhibit an antagonistic relationship. Similar observations are also reported in chickpea (Cicer L.) (Gallardo et al 1995), Arabidopsis thaliana (Hu et al 2006) and in maize (Feng et al 2011). We therefore speculate that potential metabolic interaction/ competition between PAs (Spd and Spm) and ethylene biosynthesis may regulate the physiological processes of spikelet development in rice.…”

Section: Discussionsupporting

confidence: 74%

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

Wang

Jing-chao

et al. 2011

Plant Growth Regul

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This study was to test the hypothesis that polyamines (PAs) and ethylene and their interactions may be involved in mediating the post-anthesis development of spikelets in rice (Oryza sativa L.). Six rice cultivars differing in grain filling rate were field-grown, and the changing patterns of PAs and ethylene levels in rice spikelets during the filling and their relations with grain filling rates were investigated. The results showed that inferior spikelets had much greater ethylene evolution rate and 1-aminocylopropane-1-carboxylic acid (ACC) concentration than superior spikelets. Opposite to ethylene production, superior spikelets showed much higher freespermidine (Spd) and free-spermine (Spm) concentrations than inferior spikelets. Grain filling rate was very significantly and negatively correlated with ethylene evolution rate and ACC concentration, whereas positively correlated with free-Spd and free-Spm concentrations and with the ratio of free-Spd or free-Spm to ACC. Application of Spd, Spm, or aminoethoxyvinylglycine (an inhibitor of ethylene synthesis by inhibiting ACC synthesis) to panicles at the early grain filling stage significantly reduced ethylene evolution rate and ACC concentration, while significantly increased Spd and Spm concentrations, grain filling rate and grain weight of inferior spikelets. Application of ACC, ethephon (an ethylene-releasing agent), or methylglyoxal-bis (guanylhydrazone) (an inhibitor of Spd and Spm synthesis) showed the opposite effects. The results suggest that antagonistic interactions between PAs (Spd and Spm) and ethylene may be involved in mediating grain filling. A higher ratio of free-Spd or free-Spm to ethylene in rice spikelets could enhance grain filling.

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Section: Discussionsupporting

confidence: 74%

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

Wang

Jing-chao

et al. 2011

Plant Growth Regul

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“…In contrast, expression of ADC2, a key gene in polyamine biosynthesis, is reduced in dominant ethylene signaling and synthesis mutants, coincident with ethylene response elements in the promoters of ADC1/2 . Similar antagonism between polyamine and ethylene biosynthetic pathways has been reported for in vitro and in vivo plant morphogenesis (Scaramagli et al 1999;Torrigiani et al 2003;Hu et al 2006).…”

Section: Polyamines and Zygotic Embryogenesismentioning

confidence: 72%

The role of polyamines during in vivo and in vitro development

Baron

Stasolla

2008

In Vitro Cell.Dev.Biol.-Plant

101

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Polyamines are ubiquitous polycationic compounds that mediate fundamental aspects of cell growth, differentiation, and cell death in eukaryotic and prokaryotic organisms. In plants, polyamines are implicated in a variety of growth and developmental processes, in addition to abiotic and biotic stress responses. In the last decade, mutant studies conducted predominantly in Arabidopsis thaliana revealed an obligatory requirement for polyamines in zygotic and somatic embryogenesis. Moreover, our appreciation for the intricate spatial and temporal regulation of intracellular polyamine levels has advanced considerably. The exact molecular mechanism(s) through which polyamines exert their physiological response remains somewhat enigmatic and likely serves as a major area for future research efforts. In the following review, we discuss recent advances in the plant polyamine field, which range from metabolism and mutant characterization to molecular genetics and potential mode(s) of polyamine action during growth and development in vitro and in vivo. This review will also focus on the specific role of polyamines during embryogenesis and organogenesis.

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“…Indeed, expression of polyamine biosynthesis genes and polyamine levels are altered in response to treatment with cytokinins, auxins, abscisic acid, gibberellins, and jasmonates (Altman, 1989;Biondi et al, 2001;Hanzawa et al, 2002;Imai et al, 2004a;Urano et al, 2004;Muñ iz et al, 2008;Cui et al, 2010). The reverse is also true: whereas abscisic acid and cytokinin biosynthesis are induced by polyamines (Cuevas et al, 2009;Wang et al, 2009;Cui et al, 2010), ethylene and gibberellin production are down-regulated (Alcázar et al, 2005;Hu et al, 2006). Accordingly, the interaction between different hormones might be mediated in part by polyamines that would function as secondary messengers (Walters and Shuttleton, 1985;Hanzawa et al, 2002).…”

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confidence: 88%

Bacterial and Plant Signal Integration via D3-Type Cyclins Enhances Symptom Development in the Arabidopsis-Rhodococcus fasciansInteraction

et al. 2011

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The phytopathogenic actinomycete Rhodococcus fascians drives its host to form a nutrient-rich niche by secreting a mixture of cytokinins that triggers plant cell division and shoot formation. The discrepancy between the relatively low amount of secreted cytokinins and the severe impact of R. fascians infection on plant development has puzzled researchers for a long time. Polyamine and transcript profiling of wild-type and cytokinin receptor mutant plants revealed that the bacterial cytokinins directly stimulated the biosynthesis of plant putrescine by activating arginine decarboxylase expression. Pharmacological experiments showed that the increased levels of putrescine contributed to the severity of the symptoms. Thus, putrescine functions as a secondary signal that impinges on the cytokinin-activated pathway, amplifying the hormone-induced changes that lead to the formation of a leafy gall. Exogenous putrescine and treatment with polyamine biosynthesis inhibitors combined with transcript and polyamine analyses of wild-type and mutant plants indicated that the direct target of both the bacterial cytokinins and plant putrescine was the expression of D3-type cyclins. Hence, the activated D-type cyclin/ retinoblastoma/E2F transcription factor pathway integrates both external and internal hormonal signals, stimulating mitotic cell divisions and inducing pathological plant organogenesis.

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Modulation of SAMDC expression in Arabidopsis thaliana alters in vitro shoot organogenesis

Cited by 39 publications

References 42 publications

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

Polyamine and ethylene interactions in grain filling of superior and inferior spikelets of rice

The role of polyamines during in vivo and in vitro development

Bacterial and Plant Signal Integration via D3-Type Cyclins Enhances Symptom Development in the Arabidopsis-Rhodococcus fasciansInteraction

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