Epicormic Bud Development in<i>Quercus robur</i>L. Studies of Endogenous IAA, ABA, IAA Polar Transport and Water Potential in Cambial Tissues10

Wignall, T. A.; Browning, G.

doi:10.1093/jxb/39.12.1667

Cited by 17 publications

(6 citation statements)

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“…This suggests that damage to trunk phloem by bark stripping could alter the hormone balance of the trunk below a wound, probably by inhibiting the downward transport of plant hormones from apical tissues above. Previous studies have reported that severing the phloem in the trunk using partial notch girdling stimulated resprouting in oak (Quercus robur) without the removal of apical tissues (Wignall et al 1987;Wignall and Browning 1988). Moreover, we found that the number of resprouting shoots increased with bark-stripping intensity.…”

Section: Discussionsupporting

confidence: 62%

“…For plant parts below the wound, bark stripping release outgrowth of dormant buds from apical dominance, which is controlled by the ratio of cytokinin to auxin (Cline et al 1997). Thus, the wound can stimulate resprouting from the lower trunk (Wignall et al 1987;Wignall and Browning 1988). These resprouting leaves may contain greater nitrogen and lower levels of defensive compounds (e.g., condensed tannin, total phenolics) and may facilitate insect herbivory (Danell and Huss-Danell 1985;Nakamura et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Spatially distinct responses within willow to bark stripping by deer: effects on insect herbivory

Tanaka

Nakamura

2015

Sci Nat

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Within individual plants, cervid herbivory may cause positive or negative plant-mediated effects on insect herbivores, depending on where it occurs. Using a combination of field observations and artificial bark-stripping experiments in Hokkaido, Japan, we examined the plant-mediated effects of bark stripping by sika deer (Cervus nippon yesoensis) on insect herbivory in two spatially distinct parts of willow (Salix udensis) trees: resprouting leaves below bark-stripping wounds and canopy leaves above. Natural and artificial bark stripping stimulated resprouting from trunks below wounds. Resprouting leaves on bark-stripped trees had lower total phenolics, condensed tannin, and C/N ratios than did canopy leaves on control trees. Herbivory rates were higher in resprouting leaves on bark-stripped trees than in canopy leaves on controls. Conversely, above-wound canopy leaves on bark-stripped trees had higher total phenolics than did those on controls, while herbivory rates were lower in the canopy leaves of bark-stripped trees than in those on controls. These results demonstrate that plant-mediated effects of bark stripping diverge between plant tissues below and above wounds in individual willow trees. We submit that focusing on multiple plant parts can elucidate plant-mediated effects at the whole-plant scale.

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Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Spatially distinct responses within willow to bark stripping by deer: effects on insect herbivory

Tanaka

Nakamura

2015

Sci Nat

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“…Water potential gradients within the whole vascular plant act to mobilize water in the radial as well as the axial direction. There are few experimental data yet available (Wignall & Browning 1988;Van Bel 1990), but it can be imagined that a perpetual tug-of-war for available water occurs through the rays, between the phloem and xylem (Fig. 7).…”

Section: IIImentioning

confidence: 99%

Xylogenesis, Genetic and Environmental Regulation-A Review-

Savidge¹

1996

IAWA J

135

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A critique is provided of the physical and chemical control of primary and secondary xylem development in terms of mechanics, genetics, phylogenetics, and the larger field of plant physiology. Strengths and weaknesses of the phytohormone theory of vascular development are analyzed. Homeobox genes, sub-cellular phytohormone localization, anatomical responses to varied phytohormone ratios and dosages, polar auxin transport, second messengers, radial fluxes in water potential, intercellular signalling, lignin biochemistry, and the phylogenetic position of bryophytes in relation to xylogenesis are identified as some areas for future research. Homeodomain proteins are addressed in terms of cambial initials and cell-fate determination, and other genetic and environmental factors controlling differentiation of diverse cellular phenotypes are reviewed. As a 'continuum hypothesis', it is proposed that the extent of secondary wall sculpturing during tracheary element differentiation is a function of the duration of homeotic gene expression.

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“…The chemical nature of acropetal signals is not known, but an increase in cytokinin-like substances in coppice shoots of Eucalyptus has been demonstrated by bioassay (Taylor et al 1982). Similarly, it has been suggested that cytokinines may stimulate epicormic bud outgrowth in Qtiercus (Wignall and Browning 1988).…”

Section: Discussionmentioning

confidence: 99%

Growth patterns and endogenous indole‐3‐acetic acid concentrations in current‐year coppice shoots and seedlings of two Betula species

Rinne

Tuominen²,

Sundberg³

1993

Physiologia Plantarum

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Apical dominance, internode elongation, radial growth and xylem cell size in coppice and apical shoots of Betula pubescens B. Pendula were determined and related to endogenous indole‐3‐acetic acid (IAA) levels, measured by gas chromatography‐selected ion monitoring in the apical bud and at three positions along the stem. The effects of defoliation and debudding on morphological and anatomical characters and endogenous IAA levels were also investigated. The coppice shoots displayed superior stem elongation and increased branching during the initial phase of growth, after which their growth pattern was similar to that of the seedlings; however, their radial growth was greater throughout the experiment. Both plant types produced smaller‐sized xylem cells at the top of the shoot than at the bottom with coppice shoots tending to form larger tracheids and smaller vessels than the seedlings. There was no consistent difference in IAA concentration between the coppice shoots and the seedlings. Defoliation and debudding reduced the IAA level in the stem within 36 h and it was still low after 25 days. Although the extent of the IAA decrease was similar in both coppice shoots and seedlings, the treatments affected the morphological and anatomical characters differently in the two plant types. The results suggest that the observed differences between seedlings and coppice shoots were not mediated through a drastic change in IAA level.

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Epicormic Bud Development inQuercus roburL. Studies of Endogenous IAA, ABA, IAA Polar Transport and Water Potential in Cambial Tissues10

Cited by 17 publications

References 0 publications

Spatially distinct responses within willow to bark stripping by deer: effects on insect herbivory

Spatially distinct responses within willow to bark stripping by deer: effects on insect herbivory

Xylogenesis, Genetic and Environmental Regulation-A Review-

Growth patterns and endogenous indole‐3‐acetic acid concentrations in current‐year coppice shoots and seedlings of two Betula species

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