Circumnutation of Arabidopsis thaliana inflorescence stems

Someya, Nobutaka; Niinuma, Kanae; Kimura, Makoto; Yamaguchi, Isamu; Hamamoto, Hiroshi

doi:10.1007/s10535-006-0022-4

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…The light effect is in accordance with results in the literature on A. thaliana circumnutations of inflorescence stems at 1 g (Someya et al, 2006).…”

Section: Circumnutations During Application Of G-forcesupporting

confidence: 91%

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

2009

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Summary• In a microgravity experiment onboard the International Space Station, circumnutations of Arabidopsis thaliana were studied. Plants were cultivated on rotors under a light:dark (LD) cycle of 16 : 8 h, and it was possible to apply controlled centrifugation pulses. Time-lapse images of inflorescence stems (primary, primary axillary and lateral inflorescences) documented the effect of microgravity on the circumnutations.• Self-sustained circumnutations of side stems were present in microgravity but amplitudes were mostly very small. In darkness, centrifugation at 0.8 g increased the amplitude by a factor of five to ten. The period at 0.8 g was c. 85 min, in microgravity roughly of the same magnitude. In white light the period decreased to c. 60 min at 0.8 g (microgravity value not measurable). Three-dimensional data showed that under 0.8 g side stems rotated in both clockwise and counter-clockwise directions.• Circumnutation data for the main stem in light showed a doubling of the amplitude and a longer period at 0.8 g than in microgravity (c. 80 vs 60 min).• For the first time, the importance of gravity in amplifying minute oscillatory movements in microgravity into high-amplitude circumnutations was unequivocally demonstrated. The importance of these findings for the modelling of gravity effects on self-sustained oscillatory movements is discussed.

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“…The light effect is in accordance with results in the literature on A. thaliana circumnutations of inflorescence stems at 1 g (Someya et al, 2006).…”

Section: Circumnutations During Application Of G-forcesupporting

confidence: 91%

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

2009

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“…Perhaps the angle of bending is regulated by gravity sensing and hence amyloplast starch, whereas starch could influence the period of movements by a separate mechanism. The connection between shoot starch levels and circumnutation is further supported by a report that circumnutational movements eventually cease in Arabidopsis plants kept in the dark for 48 h or more (Someya et al 2006), possibly because of starch depletion in gravity sensing amyloplasts. However, it is interesting to note that starch does not appear to be absolutely required for circumnutation since adg1-1 stems, which contain no detectable starch (Lin et al 1988), are still capable of movement.…”

Section: Starch Mutants Show Altered Circumnutation Movementssupporting

confidence: 59%

Altered gravitropic response, amyloplast sedimentation and circumnutation in the Arabidopsis shoot gravitropism 5 mutant are associated with reduced starch levels

2008

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Plants have developed sophisticated gravity sensing mechanisms to interpret environmental signals that are vital for optimum plant growth. Loss of SHOOT GRAVITROPISM 5 (SGR5) gene function has been shown to affect the gravitropic response of Arabidopsis inflorescence stems. SGR5 is a member of the INDETERMINATE DOMAIN (IDD) zinc finger protein family of putative transcription factors. As part of an ongoing functional analysis of Arabidopsis IDD genes (AtIDD) we have extended the characterisation of SGR5, and show that gravity sensing amyloplasts in the shoot endodermis of sgr5 mutants sediment more slowly than wild type, suggesting a defect in gravity perception. This is correlated with lower amyloplast starch levels, which may account for the reduced gravitropic sensitivity in sgr5. Further, we find that sgr5 mutants have a severely attenuated stem circumnutation movement typified by a reduced amplitude and an decreased periodicity. adg1-1 and sex1-1 mutants, which contain no starch or increased starch, respectively, also show alterations in the amplitude and period of circumnutation. Together these results suggest that plant growth movement may depend on starch levels and/or gravity sensing. Overall, we propose that loss of SGR5 regulatory activity affects starch accumulation in Arabidopsis shoot tissues and causes decreased sensitivity to gravity and diminished circumnutational movements.

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“…By contrast, ultradian rhythms have periods of <1 d (seconds, minutes, or hours) and can be associated with either cellular or larger scale physiology. Examples of ultradian rhythms include the rhythm of the heart's pacemaker cells, which are responsible for the frequency of heart beats, the defecation cycle of Caenorhabditis elegans (45 s), and circumnutation during organ elongation in plants (Dekin and Haddad, 1990;Iwasaki et al, 1995;Shabala and Newman, 1997;Someya et al, 2006). The period of some ultradian rhythms is temperature compensated and remains constant at various growth temperatures (Liu and Thomas, 1994).…”

Section: Biological Rhythms and Cell-to-cell Communicationmentioning

confidence: 99%

Intercellular Communication during Plant Development

2011

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Multicellular organisms depend on cell-to-cell communication to coordinate both development and environmental responses across diverse cell types. Intercellular signaling is particularly critical in plants because development is primarily postembryonic and continuous over a plant's life span. Additionally, development is impacted by restrictions imposed by a sessile lifestyle and limitations on relative cell positions. Many non-cell-autonomous signaling mechanisms are known to function in plant development, including those involving receptor kinases, small peptides, and mobile transcription factors. In this review, we focus on recent findings that highlight novel mechanisms in intercellular signaling during development. New details of small RNA movement, including microRNA movement, are discussed, as well as protein movement and distribution of reactive oxygen species (ROS) in ROS signaling. Finally, a novel temporal mechanism for lateral root positioning and the implications for intercellular signaling are considered.

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Circumnutation of Arabidopsis thaliana inflorescence stems

Cited by 8 publications

References 20 publications

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

Gravity amplifies and microgravity decreases circumnutations in Arabidopsis thaliana stems: results from a space experiment

Altered gravitropic response, amyloplast sedimentation and circumnutation in the Arabidopsis shoot gravitropism 5 mutant are associated with reduced starch levels

Intercellular Communication during Plant Development

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