Distribution of free and bound forms of <i>cis‐trans</i> and trans‐trans abscisic acid in broad‐bean plants in relation to apical dominance

Everat‐Bourbouloux, Andrée

doi:10.1111/j.1399-3054.1987.tb04319.x

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…in maize roots [159]) ; in any case, it is usually biologically inactive and shows different uptake properties by roots [104] . (However, the recent finding of high levels of trans, trans-ABA in shoot tissue [51] might cause this view of its inactivity to be reassessed .) The naturally occurring compound is (+)-S-2-cis,4-trans-ABA .…”

Section: Techniques For Detecting and Quantifying Aba In Rootsmentioning

confidence: 99%

The r�le of abscisic acid in root growth and gravireaction: A critical review

Pilet

Barlow

1987

Plant Growth Regul

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A brief account is given of the discovery of abscisic acid (ABA) in roots and root caps of higher plants as well as the techniques by which ABA may be demonstrated in these tissues . The remainder of the review is concerned with examining the role of ABA in the regulation of root growth . In this regard, it is well established that when ABA is supplied to roots their elongation is usually inhibited, although at low external concentrations a stimulation of growth may also be found . Fewer observations have been directed at exploring the connection between root growth and the level of naturally occurring, endogenous ABA . Nevertheless, the evidence here also suggests that ABA is an inhibitory regulator of root growth . Moreover, ABA appears to be involved in the differential growth that arises in response to a gravitational stimulus . Recent reports that deny a role for ABA in root gravitropism are considered inconclusive. The response of roots to osmotic stress and the changes in ABA levels which ensue, are summarised ; so are the interrelations between ABA and other hormones, particularly auxin (e .g . indoleacetic acid) ; both are considered in the context of the root growth and development . Quantitative changes in auxin and ABA levels may together provide the root with a flexible means of regulating its growth .

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Section: Techniques For Detecting and Quantifying Aba In Rootsmentioning

confidence: 99%

The r�le of abscisic acid in root growth and gravireaction: A critical review

Pilet

Barlow

1987

Plant Growth Regul

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“…Horton, 1971;Raschke et aI., 1975;Hornberg and Weiler, 1984;Kondo and Maruta, 1987). Despite the physiologically-active (+ leis-trans and relatively inactive (-)cis-trans isomers of ABA naturally occurring in Vfaba (Everat-Bourbouloux, 1987) and both being present in the media prepared for bud-culture experiments, MS bathed in nectar containing up to 1.5 mM (or 4.5 mg/mg solute) concentrations of the (+ )eis-trans-ABA not only remained open, but their GC cytoplasms did not withdraw from the relatively rigid cell walls. The nectar pH is within the range in which ABA induced closure of stomata in leaves of another species (Hartung, 1983).…”

Section: Discussionmentioning

confidence: 99%

The Modified Stomata of the Floral Nectary of Vicia faba L.

Davis

Gunning

1993

Botanica Acta

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A comparison of developmental features and physiological responses between the modified stomata (MS) of the floral nectary and the stomata of leaves of Vicia faba L. has revealed several significant differences. In mature tissues, the frequency per unit area of MS is three times that of foliar stomata, and when only the distal quarter of nectary projections is considered, it is twelve fold higher. The walls of guard cells (GCs) of MS near the pore were four to five times thinner than those of their foliar counterparts. Average pore widths of the nectary MS remained constant throughout the day and night, contrary to those of leaves; maximal foliar apertures were similar to average pore widths of MS of nectaries. Experiments with plasmolytica demonstrated a higher osmotic potential in nectary MS, and that sister GCs of the nectary only occasionally closed their pores by movements, even when they were plasmolysed, whereas GCs of leaves were found to be plasmolysed only after their pores had shut. Abscisic acid (ABA) was always detected naturally in floral nectar. The results of experiments involving K+‐localization and the secretion of large quantities of ABA in nectar suggested that GCs of the MS lack operational systems involving K+‐influx and ABA‐receptor sites. All information gained is consistent with the earlier conclusion that the MS do not have a regulatory role in nectar secretion by flowers of V. faba.

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“…This distribution of IAA in the stem can be correlated to the gradient of metabolic acitivity observed after [3H] i6Ade feeding, and the growth potential of buds along the stem following i6Ade or zeatin application [14] . In addition, a downward gradient of free cis-trans abscisic acid occurring along the stem in Vicia faba [8] suggests that endogenous growth regulators other than IAA may be implicated in the expression of the branching pattern . With regard to the role of apically derived auxin in correlative inhibition, it was found that IAA applied in conjunction with [3H]i6Ade to isolated stem segments could affect the metabolism of the applied cytokinin .…”

Section: Discussionmentioning

confidence: 99%

The metabolism of N6(Δ2-isosopentenyl) [3H]adenine by different stem sections of Pisum sativum

King

Staden

1990

Plant Growth Regul

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Serial segments of internodal stem tissue were isolated from Pisum sativum L . shoots and incubated in a medium containing N 6(A2-isopentenyl) ['H]adenine . . The recovery of radioactive derivatives separated using HPLC indicated a gradient of cytokinin metabolic activity in the stem . This gradient of activity was found to be greatest at the basal node in young seedlings but was high both at upper and lower nodes in older plants . An attempt to correlate this phenomenon with the basipetally decreasing concentration of indole-3-acetic acid in the stem led to an experiment in which stem segments were pretreated in indole-3-acetic acid solutions before incubating in a medium containing N6(&-isopentenyl) ['H]adenine. Indole-3-acetic acid was found to have a marked effect on cytokinin metabolism in isolated stem segments . These results are discussed in relation to apical dominance in the shoot .

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Distribution of free and bound forms of cis‐trans and trans‐trans abscisic acid in broad‐bean plants in relation to apical dominance

Cited by 7 publications

References 29 publications

The r�le of abscisic acid in root growth and gravireaction: A critical review

The r�le of abscisic acid in root growth and gravireaction: A critical review

The Modified Stomata of the Floral Nectary of Vicia faba L.

The metabolism of N6(Δ2-isosopentenyl) [3H]adenine by different stem sections of Pisum sativum

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