Regulation of Pea Epicotyl Elongation by Blue Light1

Irradiation with blue light causes a rapid decrease in ster. elongation in Pisum sativum. Growing plants under continuous red light allowed us to study the fluence dependence and spatial distribution of blue-induced growth effects without interference from large changes in the ratio of the far-red absorbing form of phytochrome to total phytochrome. The magnitude of the inhibition generated by a 30-second pulse of blue light was linearly related to the log of the fluence applied over two orders of magnitude. Reciprocity held for irradiations with a pulse length shorter than the lag time for the response. The spatial distribution of inhibition was studied by marking the growing zone and photographing the stem at 10-minute intervals before, during, and after a 1-hour exposure to blue light. The region just below the hook does not undergo any perceptible change in growth rate while growth is nearly 100% inhibited in the base of the third

[1]  T. Baskin,et al.  Redistribution of growth during phototropism and nutation in the pea epicotyl , 1986, Planta.

[2]  D. Cosgrove.  Mechanism of rapid suppression of cell expansion in cucumber hypocotyls after blue-light irradiation , 2004, Planta.

[3]  D. C. Morgan,et al.  Rapid photomodulation of stem extension in light-grownSinapis alba L. , 2004, Planta.

[4]  A. Jose.  Photoreception and photoresponses in the radish hypocotyl , 2004, Planta.

[5]  Harry Smith,et al.  Analysis of growth rates during phototropism: modifications by separate light‐growth responses , 1987 .

[6]  P. Jolliffe,et al.  High-resolution studies of growth oscillations during stem elongation , 1986 .

[7]  V. Gaba,et al.  Photocontrol of Hypocotyl Elongation in De-Etiolated Cucumis sativus L. : Long Term, Fluence Rate-Dependent Responses to Blue Light. , 1984, Plant physiology.

[8]  W. Briggs,et al.  Growth distribution during first positive phototropic curvature of maize coleoptiles , 1984 .

[9]  V. Gaba,et al.  The Control of Cell Growth by Light , 1983 .

[10]  A. Galston,et al.  Physiology of Movements in Stems of Seedling Pisum sativum L. cv. Alaska : I. Experimental Separation of Nutation from Gravitropism. , 1982, Plant physiology.

[11]  D. Cosgrove.  Rapid inhibition of hypocotyl growth by blue light in Sinapis alba L. , 1982 .

[12]  C. Beggs,et al.  DEPENDENCE OF Pfr/Ptot‐RATIOS ON LIGHT QUALITY and LIGHT QUANTITY , 1982 .

[13]  D. Cosgrove,et al.  Rapid Suppression of Growth by Blue Light : BIOPHYSICAL MECHANISM OF ACTION. , 1981, Plant physiology.

[14]  V. Gaba,et al.  Two separate photoreceptors control hypocotyl growth in green seedlings , 1979, Nature.

[15]  G. Meijer.  RAPID GROWTH INHIBITION OF GHERKIN HYPOCOTYLS IN BLUE LIGHT1 , 1968 .

[16]  L. Pratt,et al.  Photochemical and Nonphotochemical Reactions of Phytochrome in vivo. , 1966, Plant physiology.

[17]  S. Hendricks,et al.  Photocontrol of Anthocyanin Formation in Turnip and Red Cabbage Seedlings. , 1957, Plant physiology.