Cholodny-went hypothesis
The Cholodny–Went model for the phototropic movement of shoots was later extended to gravitropism of roots, where auxin was thought to inhibit rather than stimulate growth and to accumulate in the lower side of a root section, causing the root to bend downward. See more In botany, the Cholodny–Went model, proposed in 1927, is an early model describing tropism in emerging shoots of monocotyledons, including the tendencies for the shoot to grow towards the light (phototropism) … See more The model was independently proposed by the Russian scientist Nikolai Cholodny of the University of Kyiv in 1927 and by Frits Warmolt Went of … See more Evidence that supports Cholodny–Went over competing theories was reported by Iino and Briggs in 1984, showing that there was decreased growth on the lighted side of a corn coleoptile and increased growth of the shaded side. Experiments on Arabidopsis thaliana in … See more The theory was widely accepted when first proposed, but began to receive serious criticism in the mid-1980s. Arguments against the model have included views that growth … See more Web植物重力生物学的Cholodny-Went假说研究进展 来自 国家科技图书文献中心 喜欢 0 阅读量： 53 作者： 刘承宪 摘要： 本文着重介绍生长素在植物向重性生长反应中作用的研究进 …
Cholodny-went hypothesis
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WebApr 1, 1999 · Back to Results The microtubule cytoskeleton does not integrate auxin transport and gravitropism in maize roots The Cholodny-Went hypothesis of gravitropism suggests that the graviresponse is controlled by the distribution of auxin. However, the mechanism of auxin transport during the graviresponse of roots is still unresolved. WebThus, it appears that the Cholodny-Went hypothesis is fundamentally valid. However, recent comparative studies of the kinetics of curvature and the timing of the development of hormone asymmetry indicate that this hypothesis alone cannot account for the intricacies of the gravitropic response.
WebThe anatomy and morphology of these graviresponding organs indicates a certain spatial separation between the sensing region and the responding one, a situation that strongly suggests the requirement of phytohormones as mediators to coordinate the process. The Cholodny-Went hypothesis suggested auxin as the main mediator of gravitropism. WebDec 1, 1996 · As early as 1926, Cholodny and Went independently presented an elegant model for gravitropism now generally known as the Cholodny–Went hypothesis [1]. They proposed that gravitropic curvature was dependent upon lateral transport of the plant hormone indole-3-acetic acid — auxin — from the upper to the lower side of a …
WebFeb 19, 2003 · In the 1920s, the Cholodny–Went hypothesis and various interpretations of it ever since have proposed that this differential growth within the EZ is mediated by … WebGravitropism is explained by the Cholodny-Went hypothesis: the basipetal flow of auxin is diverted laterally. The resulting lateral auxin gradient triggers asymmetric growth. However, the...
WebJul 9, 2002 · These observations led to the formulation of the Cholodney–Went hypothesis, which was summarised by Went and Thimann [ 1. ] in 1937 as follows: “…growth curves, whether induced by internal or external factors, are due to an unequal distribution of auxin between the two sides of the curving organ.
http://labs.biology.ucsd.edu/estelle/publications/Estelle.1996.pdf nourishing gemsWebThe Cholodny–Went hypothesis holds that gravitropic curvature of a growing plant organ depends on regulated transport of the plant hormone auxin; new studies of the … how to sign out of slackWebJan 1, 2013 · Since its introduction, the Cholodny–Went hypothesis has received wide acceptance and experimental support (Whippo and Hangarter, 2006; Holland et al., 2009). For phototropism, the … how to sign out of soundcloud pcWebIn botany, the Cholodny–Went model, proposed in 1927, is an early model describing tropism in emerging shoots of monocotyledons, including the tendencies for the shoot to grow towards the light ( phototropism) and the roots to grow downward ( gravitropism ). nourishing freezer mealsWebThe Cholodny–Went hypothesis, developed in the early 20th century, predicts that in the presence of asymmetric light, auxin will move towards the shaded side and promote elongation of the cells on that side to … nourishing generationsWebOne idea that has been around for >70 years is Cholodny–Went's hypothesis of gravitropism. This proposes that the differential growth characteristic of the gravitropic … nourishing gems bloodborneWebOct 9, 2012 · Angus S Murphy Abstract and Figures Light is a key environmental factor that drives many aspects of plant growth and development. Phototropism, the reorientation of growth toward or away from... how to sign out of sketchup