scholarly journals Light-Stimulated Cotyledon Expansion in Arabidopsis Seedlings (The Role of Phytochrome B)

1994 ◽  
Vol 104 (3) ◽  
pp. 1027-1032 ◽  
Author(s):  
M. M. Neff ◽  
E. Van Volkenburgh
Keyword(s):  
Phytochrome B ◽  
Cotyledon Expansion

scholarly journals Factors Affecting Gerebera jamesonii Early Seedling Branching and Mortality

1996 ◽  
Vol 6 (1) ◽  
pp. 59-61
Author(s):  
Roar Moe ◽  
John E Erwin ◽  
Will Carlson
Keyword(s):  
Dry Weight ◽  
Seedling Development ◽  
Natural Light ◽  
Gerbera Jamesonii ◽  
Seedling Mortality ◽  
Factors Affecting ◽  
Early Seedling ◽  
Tree Leaf ◽  
Cotyledon Expansion

The role of irradiance and/or ethylene in inducing mortality and self-branching disorders in Gerbera jamesonii Bolus. seedlings was studied. Seedling mortality increased from 8% to 57% when seed was covered with vermiculite than left uncovered during germination. Supplemental lighting for 30 days after germination decreased seedling mortality and decreased the time to visible bud compared to seed germinated under natural light only. In subsequent experiments, seeds were germinated and then seedlings were water logged or sprayed with ethephon (0.69, 3.45, or 17.25 mM) at four different stages of seedling development. Half of the ethephon-treated seedlings were sprayed with silver thiosulfate (STS). Seedling mortality was greatest after cotyledon expansion but before expansion of the first tree leaf. The highest ethephon concentration caused reduced seedling dry weight after 42 days. Applying STS did not overcome self-branching or meristem necrosis.

Role of phytochrome B in the development of cold tolerance in cucumber plants under light and in darkness

2013 ◽  
Vol 60 (3) ◽  
pp. 383-387 ◽  
Author(s):  
M. I. Sysoeva ◽  
E. F. Markovskaya ◽  
E. G. Sherudilo
Keyword(s):  
Cold Tolerance ◽  
Phytochrome B

scholarly journals The Mechanism of Rhythmic Ethylene Production in Sorghum. The Role of Phytochrome B and Simulated Shading

1999 ◽  
Vol 119 (3) ◽  
pp. 1083-1090 ◽  
Author(s):  
Scott A. Finlayson ◽  
In-Jung Lee ◽  
John E. Mullet ◽  
Page W. Morgan
Keyword(s):  
Ethylene Production ◽  
Phytochrome B

The role of phytochrome B, D and E in thermoperiodic responses of Arabidopsis thaliana

2008 ◽  
Vol 56 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Elin Thingnaes ◽  
Sissel Torre ◽  
Roar Moe
Keyword(s):  
Arabidopsis Thaliana ◽  
Phytochrome B

Role of Phytochrome B in the Induction of Seed Germination by Light in Arabidopsis thaliana

1995 ◽  
Vol 146 (3) ◽  
pp. 307-312 ◽  
Author(s):  
Javier F. Botto ◽  
Rodolfo A. Sánchez ◽  
Jorge J. Casal
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Phytochrome B

scholarly journals SPAs promote thermomorphogenesis by regulating the phyB-PIF4 module in Arabidopsis

Development ◽  
2020 ◽  
Vol 147 (19) ◽  
pp. dev189233 ◽  
Author(s):  
Sanghwa Lee ◽  
Inyup Paik ◽  
Enamul Huq
Keyword(s):  
Ambient Temperature ◽  
Kinase Activity ◽  
High Ambient Temperature ◽  
Fine Tuning ◽  
Global Changes ◽  
Phytochrome B ◽  
Profound Influence ◽  
Hyponastic Growth

ABSTRACTHigh ambient temperature attributable to global warming has a profound influence on plant growth and development at all stages of the life cycle. The response of plants to high ambient temperature, termed thermomorphogenesis, is characterized by hypocotyl and petiole elongation and hyponastic growth at the seedling stage. However, our understanding of the molecular mechanism of thermomorphogenesis is still rudimentary. Here, we show that a set of four SUPPRESSOR OF PHYA-105 (SPA) genes is required for thermomorphogenesis. Consistently, SPAs are necessary for global changes in gene expression in response to high ambient temperature. In the spaQ mutant at high ambient temperature, the level of SPA1 is unaffected, whereas the thermosensor phytochrome B (phyB) is stabilized. Furthermore, in the absence of four SPA genes, the pivotal transcription factor PIF4 fails to accumulate, indicating a role of SPAs in regulating the phyB-PIF4 module at high ambient temperature. SPA1 directly phosphorylates PIF4 in vitro, and a mutant SPA1 affecting the kinase activity fails to rescue the PIF4 level in addition to the thermo-insensitive phenotype of spaQ, suggesting that the SPA1 kinase activity is necessary for thermomorphogenesis. Taken together, these data suggest that SPAs are new components that integrate light and temperature signaling by fine-tuning the phyB-PIF4 module.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management
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