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Lettuce seed germination: A phytochrome-mediated increase in the growth rate of lettuce seed radicles

โœ Scribed by Joseph Scheibe; Anton Lang

Publisher
Springer-Verlag
Year
1967
Tongue
English
Weight
308 KB
Volume
72
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

The rate of straight growth in mannitol of the axial portion of 2 different samples of photosensitive lettuce seeds was followed after red and far-red irradiation, If the growing half-seeds were classified into proportions of the sample that had undergone a growth increment greater than a certain, selected value, growth rate was found to be enhanced by red light and this enhancement paralleled the phytochrome-mediated increase in the rate of appearance of a geotropic curvature in seed axes, an effect which had been previously reported. The increase in the rate of growth of the radicle by red light was limited to early growth. Once extension has exceeded a certain value the rate of further growth is independent of the state of phytochrome.

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