Journal ArticleDOI
Shoot growth in willow (Salix viminalis) in relation to abscisic acid, plant water status and photoperiod
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The decline in growth rate of field-grown willow trees in Aberystwyth, U.K., began in mid-summer and was followed by the senescence and abortion of shoot tips, coincident with low leaf water potentials that developed in summer.Abstract:
The decline in growth rate of field-grown willow trees in Aberystwyth, U.K., began in mid-summer and was followed by the senescence and abortion of shoot tips. These events were not triggered by a decline in the length of the natural photoperiod but were coincident with low leaf water potentials that developed in summer. Transient increases in the abscisic acid (ABA) content of shoot tips were observed during the period of declining water potential. These increases were roughly coincident with the onset of growth decline and preceded abortion and senescence of shoot tips. Under controlled conditions growth of both rooted cuttings and potted plants was arrested by short days (8 h) without any increase in tip ABA levels. Growth of rooted cuttings under long days (16 h) was inhibited by exogenous ABA; this inhibition could be relieved by addition of gibberellic acid (GA3) to the nutrient solution. Growth of aseptically cultured apices was also inhibited by ABA; this inhibition was relieved by joint application of GA9 and zeatin riboside.read more
Citations
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Book ChapterDOI
Hormonal control of radial and longitudinal growth in the tree stem
TL;DR: A review of the evidence implicating the currently recognized hormone classes in the regulation of radial and longitudinal growth in the stem and shoots of woody species can be found in this paper.
Journal ArticleDOI
Seasonal changes in bud dormancy in relation to bud morphology, water and starch content, and abscisic acid concentration in adult trees of Betula pubescens
TL;DR: The results indicate a role for ABA in maintaining dormancy of the terminal buds of short shoots and emphasize the relationship between tissue water status and ABA concentration.
Journal ArticleDOI
Growth cessation and bud dormancy in relation to ABA level in seedlings and coppice shoots of Betula pubescens as affected by a short photoperiod, water stress and chilling
TL;DR: The observed correlation between ABA level and water content in buds during induction of dormancy under SD and water stress conditions indicates a possible role for ABA in the regulation of dormancies.
Book ChapterDOI
Molecular Aspects of Bud Dormancy in Trees
Antje Rohde,G. T. Howe,Jorunn E. Olsen,Thomas Moritz,M. Van Montagu,Olavi Junttila,Wout Boerjan +6 more
TL;DR: Because bud dormancy can be imposed for both morphogenetic and adaptive reasons, trees can adapt to a wide range of growth conditions.
Journal ArticleDOI
Gibberellins and photoperiodic control of shoot elongation in Salix
Olavi Junttila,Einar Jensen +1 more
TL;DR: In seedlings exposed to a prolonged SD-treatment there was a significant positive interaction between a transfer to LD and a treatment with GA20 and GA1 on shoot elongation, which is compatible with the suggestion that conversion of GA19 to GA20 is blocked under SD.
References
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Journal ArticleDOI
A revised medium for rapid growth and bio assays with tobacco tissue cultures
Toshio Murashige,Folke Skoog +1 more
TL;DR: In vivo redox biosensing resolves the spatiotemporal dynamics of compartmental responses to local ROS generation and provide a basis for understanding how compartment-specific redox dynamics may operate in retrograde signaling and stress 67 acclimation in plants.
Journal ArticleDOI
Sap Pressure in Vascular Plants: Negative hydrostatic pressure can be measured in plants.
TL;DR: A method is described which permits measurement of sap pressure in the xylem of vascular plants, and finds that in tall conifers there is a hydrostatic pressure gradient that closely corresponds to the height and seems surprisingly little influenced by the intensity of transpiration.
Journal ArticleDOI
Mineral Nutrition in Plants: Principles and Perspectives.
H. David Hammond,Emanuel Epstein +1 more
Journal ArticleDOI
Biochemistry and physiology of abscisic acid.
TL;DR: This chapter discusses the localization and regulation of ABA, the mode of action of A.lJA, and the role of stomatal complexes and A.spoTf in this synthesis.
Journal ArticleDOI
Dormancy of trees in winter.
TL;DR: Dormancy of trees can be divided arbitrarily into three phases: early rest, winter rest, and after-rest, and each of these phases is marked by a distinct set of physiological processes.