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PLANT PHYSIOLOGY , Vol 104, Issue 3 1027-1032, Copyright © 1994 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Light-Stimulated Cotyledon Expansion in Arabidopsis Seedlings (The Role of Phytochrome B)
M. M. Neff and E. Van Volkenburgh
Department of Botany AJ-30, University of Washington, Seattle, Washington 98195
Leaf and cotyledon expansion in dicotyledonous plants is a light-dependent
developmental process. The unique role of phytochrome B has been tested by
investigating expansion of cotyledons in wild-type and
phytochrome-deficient mutants of Arabidopsis thaliana (L.) Heynh. A
relatively rapid method for measuring cotyledon area was developed to
quantify growth in large populations (average n [greater than or equal to]
100) of wild-type or mutant seedlings under different light and chemical
treatments. Three-day-old wild-type (La-er) Arabidopsis seedlings, grown in
saturating, low-fluence red light (2-4 [mu]mol m-2 s-1), showed a >250%
increase in cotyledon area after 48 h of bright-red light when compared
with the phytochrome mutants hy1, hy2, and hy3. An increase in epidermal
cell area was observed in wild-type cotyledons but not in hy3, indicating
that light-stimulated growth is due in part to cell expansion. The mutant
phenotype was rescued by feeding the chromophore precursor biliverdin to
the chromophore biosynthesis mutants hy1 and hy6. This treatment did not
rescue the hy3 mutant. Since the hy3 lesion is specific to phytochrome B,
we conclude that this pigment is involved in the enhancement of cotyledon
cell expansion in bright-red light.
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