Preliminary observations on growth and phototropic response of oat seedlings
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Preliminary observations on growth and phototropic response of oat seedlings by Enoch Karrer

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Published by Smithsonian Institution in Washington .
Written in English


  • Plants -- Effect of light on.,
  • Growth (Plants),
  • Phototropism.,
  • Seedlings.,
  • Oats.

Book details:

Edition Notes

Statementby Enoch Karrer.
SeriesSmithsonian miscellaneous collections,, v. 95, no. 9
LC ClassificationsQ11 .S7 vol. 95, no. 9
The Physical Object
Pagination1 p.l., 4 p.
ID Numbers
Open LibraryOL6343558M
LC Control Number36026448

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In , Charles Darwin, with the help of his son researched phototropism on canary grass and oat coleoptiles and recorded his observations in the book ‘The Power of Movement in Plants'. They observed the bending of seedlings towards sunlight. They demonstrated by covering the tips of the oat coleoptiles which prevented it from photosynthesis. PDF | On , Winslow R. Briggs and others published The Phototropic Responses of Higher Plants | Find, read and cite all the research you need on ResearchGateAuthor: Winslow Briggs. The observation that etiolated seedlings exposed to continuous unilateral bright light have a slower response than seedlings exposed to continuous dim light was first observed by von Wiesner (). As already discussed, von Wiesner was investigating whether phototropism is a passive mechanical consequence of light or an inductive response. Very few mature plants show any evidence of a previous phototropic response, in marked contrast to the nearly universal evidence of a gravitropic (geotropic) response (a directional growth.

The book provides an important summary of oat nutritional research and associated health claims that have been granted in recognition of the nutritional benefits associated with oat consumption. The individual chapters on component chemistry and functionality provide an excellent resource for product developers in their quest to design new. Basic requirements Oats grow best in cool, moist climates, with the optimum temperature for growth being between 20 and 21°C (68–70°F). The plants will thrive in well drained soils but are adapted to grow in many soil types, requiring a pH between and   Phototropism is a classic example of such an adaptive growth response. In flowering plants, phototropism is induced by UV/blue wavelengths (– nm) and remarkably, this phototropic response is evoked over a large range of light intensities ranging from minute amounts of light to the blue light intensity present on a sunny day. Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots. Tremendous advances have been made in our understanding of the molecular, biochemical, and cellular bases of phototropism in recent years.

A young oat seedling and a mature oat plant with the various plant parts labelled. Figure 2 shows the general pat­ tern of growth (dry weight) and nutrient accumulation during the growth of an oat plant. To standard­ ize the uptake curves, each curve is expressed as . intact oat seedlings. We will present evidence here to suggest both that the LIAC and phototropism are interrelated and that the flavin-Cyt complex is likely to be the photoreceptor for the first positive phototropic response of oat coleoptiles. A preliminary report of this work has appeared elsewhere (10). MATERIALS AND METHODS. Zimmerman and Briggs (a, b) then developed a kinetic model for the phototropic responses of oat coleoptiles, based on a detailed series of fluence-response curves, developing a set of differential equations to describe the various curves. The model for first positive phototropism involved an initial photoreceptor activation and its.   Phototropism - or how plants lean towards the light Many plants have a tendency to lean towards the light. Until Charles Darwin and his son performed what is now a famous experiment in botany, sparking detailed investigations into how plants grow towards the light, spanning three centuries.