Results 221 to 230 of about 9,160 (246)

Touch and gravitropic set-point angle interact to modulate gravitropic growth in roots

Advances in Space Research, 2003
Plant roots must sense and respond to a variety of environmental stimuli as they grow through the soil. Touch and gravity represent two of the mechanical signals that roots must integrate to elicit the appropriate root growth patterns and root system architecture. Obstacles such as rocks will impede the general downwardly directed gravitropic growth of
G D, Massa, S, Gilroy
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Evaluation of Gravitropism in Non-seed Plants

2021
Tropisms are among the most important growth responses for plant adaptation to the surrounding environment. One of the most common tropisms is root gravitropism. Root gravitropism enables the plant to anchor securely to the soil enabling the absorption of water and nutrients.
Zhang, Yuzhou, Li, Lanxin, Friml, Jiří
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Gravitropism in tip-growing cells

Planta, 1997
Unicellular tip-growing cells are excellent experimental systems in which to study gravitropism because cell extension, gravity sensing and the gravity response are all confined to the apical dome. Thus various approaches can be used to determine the distinct steps of the short gravitropic signal-transduction chain, which lacks a signal-transmission ...
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Calcium in gravitropism. A re-examination

Planta, 1997
For more than a decade it has been assumed that there is a strong relationship between Ca2+ and gravitropism. There is evidence to suggest that the movement of Ca2+ in the wall might regulate extension growth and that free intracellular Ca2+ might mediate signalling in statocytes.
W, Sinclair, A J, Trewavas
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Plant gravitropic response.

Advances in space biology and medicine, 1997
The gravitropic response of plants to a change in the gravity vector may be divided. in the phase of induction and expression. During the induction phase the amyloplasts, due to their greater density than the cytoplasmic density, shift their position in less than a minute.
A, Merkys, J, Darginaviciene
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Gravitropism and mechanical signaling in plants

American Journal of Botany, 2013
Mechanical stress is a critical signal affecting morphogenesis and growth and is caused by a large variety of environmental stimuli such as touch, wind, and gravity in addition to endogenous forces generated by growth. On the basis of studies dating from the early 19th century, the plant mechanical sensors and response components related to gravity can
Masatsugu, Toyota, Simon, Gilroy
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Microinjection - a tool to study gravitropism

Advances in Space Research, 2003
Despite extensive studies on plant gravitropism this phenomenon is still poorly understood. The separation of gravity sensing, signal transduction and response is a common concept but especially the mechanism of gravisensing remains unclear. This paper focuses on microinjection as powerful tool to investigate gravisensing in plants.
P, Scherp, K H, Hasenstein
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Gravitropic responses of the Avena coleoptile in space and on clinostats.I. Gravitropic response thresholds

Physiologia Plantarum, 1995
We conducted a series of gravitropic experiments on Avena coleoptiles in the weightlessness environment of Spacelab. The purpose was to test the threshold stimulus, reciprocity rule and autotropic reactions to a range of g‐force stimulations of different intensities and durations The tests avoided the potentially complicating effects of earth's gravity
A H, Brown, D K, Chapman, A, Johnsson, D, Heathcote   +3 more
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Signaling in Plant Gravitropism

2009
Most plant organs use gravity as a guide for growth. Gravity sensing occurs mainly in specialized cells, named “statocytes,” through the sedimentation of starch-filled plastids (amyloplasts). This movement triggers a pathway that leads to lateral auxin transport across the stimulated organ, responsible for curvature at the elongation zone.
John Stanga, Carolyn Neal, Laura Vaughn, Katherine Baldwin, Gengxiang Jia   +4 more
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[Microgravity and root gravitropism].

Acta botanica Gallica : bulletin de la Societe botanique de France, 1999
Space experiments permit to understand better some phases of the gravitropic reaction which occurs when the orientation of the root changes in the gravitational field. In gravisensing cells (statocytes in the root cap), the nucleus is attached to the cell periphery, close to the plasma membrane, by actin filaments.
G, Perbal, D, Driss-Ecole
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