Light and Growth

Priestley, J. H.

doi:10.1111/j.1469-8137.1926.tb06688.x

Cited by 45 publications

(14 citation statements)

References 19 publications

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“…Priestlev (17) examined the effect of brief daily irradiations on plasmolysis of epidermal cells of the pea epicotyl. He reported a difference in the apparent plasmolvsis of dark-grown and light-treated tissues wlhiclihe interpreted as a difference in the (legree to which the protoplast a(ldleres to the cell wall.…”

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confidence: 99%

Intracellular Mechanism of Growth Inhibition by Radiant Energy

Lockhart

1960

Plant Physiol.

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Visible radiant energy retards stem growth of most higher plants. Growth inhibition is due principally to a decrease in cell elongation with little effect on cell numbers. This conclusion is supported by cell counts (22) and by the finding that growth inhibition occurs in the morphological region of elongation (11; Lockhart, unpubl.). An investigation has been made of the influence of radiation on various physical properties of elongating stem cells, to learn what phase of the cellular growth process is affected bv irradiation.Elongation of stem cells takes place through the uptake of wvater and concurrent stretching of the cell wall. It has been established that the factor which causes cell elongation and controls rate is an increased plasticity of the cell wall. Yielding of the cell wall under stress of turgor pressure results in an increased (liffusion pressure deficit (DPD) and resultant uptake of water (1,15,21). The reduction in growth rate of a plant stem as a result of irradiation could be due to effects on any of three factors which infltience DPD.Radiation could act by 1) reducing osmotic concentratioin within the growing cells, 2) by reducing the plasticity of the cell walls, or 3) by reducing the rate of water movement through the tissue.Du Buy (2) investigated the effect of blue radiatioIn on the plasticity of .4vena coleoptile sections.Dark-grown. auxin-treated coleoptile sectionis showed an increase in plasticity (after 180 min) while irradiated sections showed no corresponding increase. Giessner (5) found that visible radiation, as well as other treatments which inhibit growth. reduced the plasticity of Helianthus hvpocotyls.Priestlev (17) examined the effect of brief daily irradiations on plasmolysis of epidermal cells of the pea epicotyl. He reported a difference in the apparent plasmolvsis of dark-grown and light-treated tissues wlhiclihe interpreted as a difference in the (legree to which the protoplast a(ldleres to the cell wall. Tt is noteworthv that lie did not find this effect whlen the plants were irradiated for 3 lhours imnimdiately prior to analysis. De Haan and Gorter (6) reported no difference in ossmotic values of greenhouse-grown tall and dwarf peas. found the uptake of indole-3-acetic acid by stem sections wa-,,-s decreased 1y prior irradiation of the plants. ' The radiation source for all experiments described here was a single pink 48 inch fluorescent tube wrapped in two layers of 0.005 inch red cellulose acetate.Seedlings were placed approximately 30 cm from the tuibe giving an intensity at the growing region of about 150 ergs -cm-2. sec-1. For reasons discussed below, the standard irradiation period was 3 hoturs. Tmmediately after irradiation the sections were cut for use. All experiments were carried out under weak green radiation.For determining the time-course of growth, vigorous. uniform plants were selected and transferred intact to 2 dram polyethylene vials containing enough distilled water to immerse about a third of the root system. The plants were supported bv c...

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confidence: 99%

Intracellular Mechanism of Growth Inhibition by Radiant Energy

Lockhart

1960

Plant Physiol.

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“…The endodermis was more prominent in etiolated plants, light seeming to suppress the Casparian strip. Bond was of the opinion that this characteristic structure is formed from internal secretions sensitive to light, but not from fatty acids as proposed by Priestley (1926) and might be vestigial, without a present function, a view not sustained by later work. In Vicia and Phaseolus he also studied the effect of cotyledon removal on vascular development, challenging Flaskamer's (1910) observations on pith reduction and vascular condensation.…”

Section: The Plant Endodermismentioning

confidence: 91%

George Bond, 21 February 1906 - 5 January 1988

1990

Biogr. Mems Fell. R. Soc.

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George Bond was born at Shirebrook, Derbyshire. His father William Arthur Bond, who was a colliery engineer, was brought up in Eckington, Derbyshire, and Killamarsh, Yorkshire. Showing great promise at school he was kept on for a year as a pupil-teacher. But this did not suit him and he left to train as a blacksmith and then a colliery winder. George Bond’s mother, Minnie, née Brown, came from Dordon near Tamworth. This firm Midland background may surprise some of his friends, who lacking a keen ear for regional speech may have regarded George Bond as an archetypical Scot, rather dour but kindly, careful but not mean. Throughout his long Glaswegian career he stoutly maintained his Englishness, shown by his love of gardening and home pursuits, the countryside, cricket and cycling. In fine weather he cycled to work in shorts, hardly the attire of a Scotsman!

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“…The endodermis of the mesocotyl and lower internodes in rice seedlings might have similar roles despite apparent evidences. In addition, Casparian bands have been found to develop in etiolated stem of some dicotyledonous plants (Priestly, 1926;van Fig. 4.…”

Section: Discussionmentioning

confidence: 99%