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Phytochromes inhibit hypocotyl negative gravitropism by regulating the development of endodermal amyloplasts through phytochrome-interacting factors

Phytochromes are red and far-red light photoreceptors that regulate various aspects of plant development. One of the lessunderstood roles of phytochromes is the inhibition of hypocotyl negative gravitropism, which refers to the loss of hypocotyl gravitropism and resulting random growth direction in... Full description

Journal Title: Proceedings of the National Academy of Sciences 01/25/2011, Vol.108(4), pp.1729-1734
Main Author: Kim, K.
Other Authors: Shin, J. , Lee, S.-H. , Kweon, H.-S. , Maloof, J. N. , Choi, G.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: http://dx.doi.org/10.1073/pnas.1011066108
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title: Phytochromes inhibit hypocotyl negative gravitropism by regulating the development of endodermal amyloplasts through phytochrome-interacting factors
format: Article
creator:
  • Kim, K.
  • Shin, J.
  • Lee, S.-H.
  • Kweon, H.-S.
  • Maloof, J. N.
  • Choi, G.
subjects:
  • Photoreceptors -- Physiological Aspects
  • Plant Development -- Research
ispartof: Proceedings of the National Academy of Sciences, 01/25/2011, Vol.108(4), pp.1729-1734
description: Phytochromes are red and far-red light photoreceptors that regulate various aspects of plant development. One of the lessunderstood roles of phytochromes is the inhibition of hypocotyl negative gravitropism, which refers to the loss of hypocotyl gravitropism and resulting random growth direction in red or farred light. This light response allows seedlings to curve toward blue light after emergence from the soil and enhances seedling establishment in the presence of mulch. Phytochromes inhibit hypocotyl negative gravitropism by inhibiting four phytochrome-interacting factors (PIF1, PIF3, PIF4, PIF5), as shown by hypocotyl agravitropism of dark-grown pif1 pif3 pif4 pif5 quadruple mutants. We show that phytochromes inhibit negative gravitropism by converting starchfilled gravity-sensing endodermal amyloplasts to other plastids with chloroplastic or etioplastic features in red or far-red light, whereas PIFs promote negative gravitropism by inhibiting the conversion of endodermal amyloplasts to etioplasts in the dark. By analyzing transgenic plants expressing PIF1 with an endodermisspecific SCARECROW promoter, we further show that endodermal PIF1 is sufficient to inhibit the conversion of endodermal amyloplasts to etioplasts and hypocotyl negative gravitropism of the pif quadruple mutant in the dark. Although the functions of phytochromes in gravitropism and chloroplast development are normally considered distinct, our results indicate that these two functions are closely related. doi/ 10.1073/pnas.1011066108
language: eng
source:
identifier: ISSN: 0027-8424 ; E-ISSN: 1091-6490 ; DOI: http://dx.doi.org/10.1073/pnas.1011066108
fulltext: fulltext
issn:
  • 00278424
  • 0027-8424
  • 10916490
  • 1091-6490
url: Link


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titlePhytochromes inhibit hypocotyl negative gravitropism by regulating the development of endodermal amyloplasts through phytochrome-interacting factors
creatorKim, K. ; Shin, J. ; Lee, S.-H. ; Kweon, H.-S. ; Maloof, J. N. ; Choi, G.
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descriptionPhytochromes are red and far-red light photoreceptors that regulate various aspects of plant development. One of the lessunderstood roles of phytochromes is the inhibition of hypocotyl negative gravitropism, which refers to the loss of hypocotyl gravitropism and resulting random growth direction in red or farred light. This light response allows seedlings to curve toward blue light after emergence from the soil and enhances seedling establishment in the presence of mulch. Phytochromes inhibit hypocotyl negative gravitropism by inhibiting four phytochrome-interacting factors (PIF1, PIF3, PIF4, PIF5), as shown by hypocotyl agravitropism of dark-grown pif1 pif3 pif4 pif5 quadruple mutants. We show that phytochromes inhibit negative gravitropism by converting starchfilled gravity-sensing endodermal amyloplasts to other plastids with chloroplastic or etioplastic features in red or far-red light, whereas PIFs promote negative gravitropism by inhibiting the conversion of endodermal amyloplasts to etioplasts in the dark. By analyzing transgenic plants expressing PIF1 with an endodermisspecific SCARECROW promoter, we further show that endodermal PIF1 is sufficient to inhibit the conversion of endodermal amyloplasts to etioplasts and hypocotyl negative gravitropism of the pif quadruple mutant in the dark. Although the functions of phytochromes in gravitropism and chloroplast development are normally considered distinct, our results indicate that these two functions are closely related. doi/ 10.1073/pnas.1011066108
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date2011-01-25