Über Wuchsstoff und Geotropismus bei Gräsern

Schmitz, H.

doi:10.1007/bf01916401

Cited by 44 publications

(9 citation statements)

References 9 publications

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“…For example. the amount of auxin which can be obtained from1 grass no(les (24) and from the meristematic growth rings of sugar cane nodes (26) increases wlhen these plants are placed horizontally. There is no evi(dence, however, that auxin production or release is unilateral; lateral transport may concentrate the newly appeared1 auxin in the lower half.…”

Section: Discussionmentioning

confidence: 99%

Mediation of geotropic response by lateral transport of auxin

Gillespie

Briggs

1961

Plant Physiol.

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A suggestion concerning the mechanismii of geotropic response was offered independently by Cholodny in 1924 (12) and by Went in 1926 (27). It was known by this time that a growth pronmoting lhormone (an auxini) is produced in tips of coleoptiles and seedlings and moves in a continual strealml toward their hases. Cholodny and WVent postulated that auxin mioves also from the upper to the lower side when a shoot is placed horizontally. As a result, the growth rates of the upper and lower halves would decrease and increase, respectively, and the shoot would curve upward. In 1927 Cholodny (13)

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Section: Discussionmentioning

confidence: 99%

Mediation of geotropic response by lateral transport of auxin

Gillespie

Briggs

1961

Plant Physiol.

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“…However, it seems improbable that the inhibition was caused by a decreased auxin production, as the same reduction ofgrowth was observed with decapitated coleoptiles in the 0.05 mgjl IAA solution, in which the vertical and horizontal coleoptiles were supplied with the same quantity of auxin. As a matter of fact, in those instances reported in literature where a change of the auxin production was really found, the lateral action of gravity always caused a stimulation in stead of an inhibition of the auxin production (SCHMITZ, 1933;V AN OVERBEEK et al 1944).…”

Section: Resultsmentioning

confidence: 96%

On a Geo-Growth Reaction of the Avena Coleoptile

Anker

1960

Acta Botanica Neerlandica

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“…This observation supports Lyon's idea (15) that petiole curvature is a result of the asymmetrical distribution of auxin in the petiole. The increase in ethylene production observed may be due to an increase in auxin levels in horizontal plants (2,3,17,20 (16) suggest that polar auxin transport in sunflowers was inhibited by placing them on a clinostat.…”

Section: Discussionmentioning

confidence: 99%

Increased Ethylene Production during Clinostat Experiments May Cause Leaf Epinasty

Leather¹,

Forrence²,

Abeles

1972

Plant Physiol.

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Ethylene production from tomato (Lycopersicum esculentum L. cv. Rutgers) plants based on a clinostat doubled during the first 2 hours of rotation. Carbon dioxide blocked the appearance of leaf epinasty normally associated with plants rotated on a elinostat. These results support the idea that epinasty of clinostated plants was due to increased ethylene production and not to the cancellation of the gravitational pull on auxin transport in the petiole.Early observations of epinasty are associated with reports on the effect of illuminating gas and cigarette smoke on plants (22). Harvey (11) was the first to show that the active component was ethylene. Crocker et al. (6,7) found that concentrations of ethylene, CO, acetylene, and propylene which would induce epinasty would also reduce seedling growth. Denny (8) reported that CO, would interfere with the ability of plant emanations (presumably ethylene) to induce epinasty. Whereas only half of the 113 species of plants examined responded to ethylene (7), the effect was widespread and included monocots which showed a curling and looping of leaves (12). The dose response curve for epinasty was similar to that observed for other ethylene-mediated processes such as abscission and growth reduction. Levels as low as 17 pl/l caused some curvature (6), while concentrations greater than 100 ,ul/! had no additional effect (15). These results indicate that the site of ethylene action in epinasty is probably the same as that for abscission, growth inhibition, fruit ripening, and other ethylene-mediated phenomena.Onset of curvature is rapid, and induction times of 1 hr (7), 2 hr (18), 3 hr (23), and 5 hr (8) have been reported. Longer times are required for epinasty of huisache (6 hr) and mesquite (18 hr) (4).Curvature on the upper side of the petiole is due to expansion or growth of cells (5,7,19,23) and probably involves the action of auxin. No epinasty was observed in plants placed on clinostats when the petioles had been cut off from an auxin supply by deblading. However, they do curve when auxin is reapplied to the cut curfaces (13,21).Placing plants on a clinostat is supposed to cancel the effect of the earth's gravitational pull on leaves. Epinastic leaf curvature of plants on a clinostat was thought to indicate that the absence of a unidirectional gravitational field disrupted normal auxin transport in the petioles. In a series of papers, Lyon (13-15) developed the idea that three types of auxin transport occur in leaf petioles: polar (toward the node), dorsal (toward the upper side of the petiole), and ventral (toward the lower side of the petiole). Dorsal transport is thought to function continuously, whereas the ventral transport system is supposed to be sensitive to changes in gravitational pull and ethylene. Lyon (15) suggested that ethylene induced epinasty because it blocked ventral but not dorsal auxin transport, and the curvature resulted because of an accumulation of auxin on the upper side. The same phenomenon was thought to occur on a clinostat, only h...

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Über Wuchsstoff und Geotropismus bei Gräsern

Cited by 44 publications

References 9 publications

Mediation of geotropic response by lateral transport of auxin

Mediation of geotropic response by lateral transport of auxin

On a Geo-Growth Reaction of the Avena Coleoptile

Increased Ethylene Production during Clinostat Experiments May Cause Leaf Epinasty

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