Hydrotropism in Roots of Lupinus albus

Hooker, Henry Daggett

doi:10.1093/oxfordjournals.aob.a089544

Cited by 35 publications

(32 citation statements)

References 2 publications

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“…At this time, the mechanism of root hydrotropism is not known, though there is an indication that the sensory site resides in the root tip (1,5,7,13,19). The root tip is likely involved in hydrosensing also in maize roots because the roots did not respond to either hydrostimulation or gravistimulation when tips approximately 1.5 mm long were removed (Tables V, VII).…”

Section: Discussionmentioning

confidence: 99%

“…site for both gravitropism and hydrotropism in roots (1,5,7,8,13,19), though the signal perception mechanism for the two tropisms may well differ. Also, chemicals such as TIBA2…”

mentioning

confidence: 99%

“…Very early work showed that roots of many plant species bend tropistically toward more moistened sources (1,5,10,13,16). The hydrotropic response by which roots protect themselves from drying likely has important adaptative value especially in dry areas or in dry soil.…”

mentioning

confidence: 99%

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Hydrotropism and Its Interaction with Gravitropism in Maize Roots

Takahashi¹,

Scott²

1991

Plant Physiol.

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We have partially characterized root hydrotropism and its interaction with gravitropism in maize (Zea mays L.). Roots of Golden Cross Bantam 70, which require light for orthogravitropism, showed positive hydrotropism; bending upward when placed horizontally below a hydrostimulant (moist cheesecloth) in 85% relative humidity (RH) and in total darkness. However, the lightexposed roots of Golden Cross Bantam 70 or roots of a normal maize cultivar, Burpee Snow Cross, showed positive gravitropism under the same conditions; bending downward when placed horizontally below the hydrostimulant in 85% RH. Light-exposed roots of Golden Cross Bantam 70 placed at 700 below the horizontal plane responded positively hydrotropically, but gravitropism overcame the hydrotropism when the roots were placed at 450 below the horizontal. Roots placed vertically with the tip down in 85% RH bent to the side toward the hydrostimulant in both cultivars, and light conditions did not affect the response. Such vertical roots did not respond when the humidity was maintained near saturation. These results suggest that hydrotropic and gravitropic responses interact with one another depending on the intensity of one or both factors. Removal of the approximately 1.5 millimeter root tip blocked both hydrotropic and gravitropic responses in the two cultivars. However, removal of visible root tip mucilage did not affect hydrotropism or gravitropism in either cultivar.

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Section: Discussionmentioning

confidence: 99%

“…site for both gravitropism and hydrotropism in roots (1,5,7,8,13,19), though the signal perception mechanism for the two tropisms may well differ. Also, chemicals such as TIBA2…”

mentioning

confidence: 99%

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Hydrotropism and Its Interaction with Gravitropism in Maize Roots

Takahashi¹,

Scott²

1991

Plant Physiol.

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“…The best example of this is in plants is the preference of roots for soil with a higher water potential (Takahashi et al, 2002). The idea that plant roots penetrate the soil in search of highest water potential has been long held as truth (Darwin, 1880;Hooker, 1915), however there is very little known about how this actually happens. While we now know that gravity is the driving force behind a root's downward growth and that this growth is modulated by mechansostimulation of soil particles (Massa and Gilroy, 2003), the search for highest water potential is likely playing some role in the integrated growth response.…”

Section: Water Water Everywhere …mentioning

confidence: 99%

Plant tropisms: providing the power of movement to a sessile organism

Esmon¹,

Pedmale²,

Liscum³

2005

Int. J. Dev. Biol.

113

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In an attempt to compensate for their sessile nature, plants have developed growth responses to deal with the copious and rapid changes in their environment. These responses are known as tropisms and they are marked by a directional growth response that is the result of differential cellular growth and development in response to an external stimulation such as light, gravity or touch. While the mechanics of tropic growth and subsequent development have been the topic of debate for more than a hundred years, only recently have researchers been able to make strides in understanding how plants perceive and respond to tropic stimulations, thanks in large part to mutant analysis and recent advances in genomics. This paper focuses on the recent advances in four of the best-understood tropic responses and how each affects plant growth and development: phototropism, gravitropism, thigmotropism and hydrotropism. While progress has been made in deciphering the events between tropic stimulation signal perception and each characteristic growth response, there are many areas that remain unclear, some of which will be discussed herein. As has become evident, each tropic response pathway exhibits distinguishing characteristics. However, these pathways of tropic perception and response also have overlapping components -a fact that is certainly related to the necessity for pathway integration given the everchanging environment that surrounds every plant.

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“…1 and 12), also used by the Darwins (3) included placing seeds in a hanging cylinder of wet sawdust, which resulted in roots first growing downward (gravitropism) but then growing back up toward the wet substrate (hydrotropism). Several other approaches were used, but the first to measure moisture gradients was Hooker in 1915 (22), who made a hygrometer to measure relative humidity at two points.…”

mentioning

confidence: 99%

Where's the water? Hydrotropism in plants

Kiss

2007

Proc. Natl. Acad. Sci. U.S.A.

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Hydrotropism in Roots of Lupinus albus

Cited by 35 publications

References 2 publications

Hydrotropism and Its Interaction with Gravitropism in Maize Roots

Hydrotropism and Its Interaction with Gravitropism in Maize Roots

Plant tropisms: providing the power of movement to a sessile organism

Where's the water? Hydrotropism in plants

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