scholarly journals The Induction of Seed Germination in Arabidopsis thaliana Is Regulated Principally by Phytochrome B and Secondarily by Phytochrome A

1994 ◽  
Vol 104 (2) ◽  
pp. 363-371 ◽  
Author(s):  
T. Shinomura ◽  
A. Nagatani ◽  
J. Chory ◽  
M. Furuya
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Phytochrome B ◽  
Phytochrome A

scholarly journals Arabidopsis chloroplast J protein DJC75/CRRJ mediates nitrate-promoted seed germination in the dark

2020 ◽  
Vol 125 (7) ◽  
pp. 1091-1099
Author(s):  
Huai-Syuan Ciou ◽  
Yu-Lun Tsai ◽  
Chi-Chou Chiu
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Germination Rate ◽  
Red Light ◽  
Phytochrome B ◽  
Biosynthetic Gene ◽  
Unknown Mechanism ◽  
J Domain ◽  
Domain Protein ◽  
J Protein

Abstract Background and Aims Nitrate can stimulate seed germination of many plant species in the absence of light; however, the molecular mechanism of nitrate-promoted seed germination in the dark remains largely unclear and no component of this pathway has been identified yet. Here, we show that a plastid J-domain protein, DJC75/CRRJ, in arabidopsis (Arabidopsis thaliana) is important for nitrate-promoted seed germination in the dark. Methods The expression of DJC75 during imbibition in the dark was investigated. The seed germination rate of mutants defective in DJC75 was determined in the presence of nitrate when light cues for seed germination were eliminated by the treatment of imbibed seeds with a pulse of far-red light to inactivate phytochrome B (phyB), or by assaying germination in the dark with seeds harbouring the phyB mutation. The germination rates of mutants defective in CRRL, a J-like protein related to DJC75, and in two chloroplast Hsp70s were also measured in the presence of nitrate in darkness. Key Results DJC75 was expressed during seed imbibition in the absence of light. Mutants defective in DJC75 showed seed germination defects in the presence of nitrate when light cues for seed germination were eliminated. Mutants defective in CRRL and in two chloroplast Hsp70s also exhibited similar seed germination defects. Upregulation of gibberellin biosynthetic gene GA3ox1 expression by nitrate in imbibed phyB mutant seeds was diminished when DJC75 was knocked out. Conclusions Our data suggest that plastid J-domain protein DJC75 regulates nitrate-promoted seed germination in the dark by upregulation of expression of the gibberellin biosynthetic gene GA3ox1 through an unknown mechanism and that DJC75 may work in concert with chloroplast Hsp70s to regulate nitrate-promoted seed germination. DJC75 is the first pathway component identified for nitrate-promoted seed germination in the dark.

Phytochromes and seed germination

1998 ◽  
Vol 8 (3) ◽  
pp. 317-329 ◽  
Author(s):  
Jorge J. Casal ◽  
Rodolfo A. Sánchez
Keyword(s):  
Seed Germination ◽  
Red Light ◽  
High Irradiance ◽  
Phytochrome B ◽  
Phytochrome A ◽  
Germination Inhibition ◽  
Growth Capacity ◽  
Small Family ◽  
Recent Advances ◽  
Signalling Process

AbstractThe control of seed germination by red and far-red light is one of the earliest documented phytochrome-mediated processes Phytochrome is now known to be a small family of photoreceptors whose apoproteins are encoded by different genes Phytochrome B (phyB) is present in dry seeds and affects germination of dark imbibed seeds but other phytochromes could also be involved Phytochrome A (phyA) appears after several hours of imbibition and mediates very-low-fluence responses PhyB and other phytochromes different from phyA mediate the classical low-fluence responses The phytochrome involved in high-irradiance responses of seed germination (inhibition of germination under continuous far-red) has not been unequivocally established, although phyA is the most likely candidate Phytochrome can affect embryo growth capacity and/or the constraint imposed by the tissues surrounding the embryo At least in some species, gibberellins participate in the signalling process In the field, phyA has been implicated in the perception of light during soil cultivations, and phyB would be involved in the perception of red/far-red ratios associated with the presence of gaps in the canopy This review describes recent advances in phytochrome research, particularly those derived from the analysis of germination in specific mutants, and their connection with traditional observations on phytochrome control of seed germination

scholarly journals Regulation of phytochrome B signaling by phytochrome A and FHY1 in Arabidopsis thaliana

1999 ◽  
Vol 18 (5) ◽  
pp. 499-507 ◽  
Author(s):  
Pablo D. Cerdan ◽  
Marcelo J. Yanovsky ◽  
F. Carolina Reymundo ◽  
Akira Nagatani ◽  
Roberto J. Staneloni ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Phytochrome B ◽  
Phytochrome A

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

Both phytochrome A and phytochrome B are required for the normal expression of phototropism in Arabidopsis thaliana seedlings

1997 ◽  
Vol 101 (2) ◽  
pp. 278-282 ◽  
Author(s):  
Abdul-kader Janoudi ◽  
Radomir Konjevic ◽  
Garry Whitelam ◽  
William Gordon ◽  
Kenneth L. Poff
Keyword(s):  
Arabidopsis Thaliana ◽  
Phytochrome B ◽  
Phytochrome A ◽  
Normal Expression

scholarly journals Different Phototransduction Kinetics of Phytochrome A and Phytochrome B in Arabidopsis thaliana

1998 ◽  
Vol 116 (4) ◽  
pp. 1533-1538 ◽  
Author(s):  
Jorge J. Casal ◽  
Pablo D. Cerdán ◽  
Roberto J. Staneloni ◽  
Laura Cattaneo
Keyword(s):  
Arabidopsis Thaliana ◽  
Phytochrome B ◽  
Phytochrome A ◽  
Kinetics Of

The effects of potassium nitrate and NO-donors on phytochrome A- and phytochrome B-specific induced germination of Arabidopsis thaliana seeds

2002 ◽  
Vol 12 (4) ◽  
pp. 253-259 ◽  
Author(s):  
Ivana Batak ◽  
Marijana Dević ◽  
Zlatko Gibal ◽  
Dragoljub Grubišić ◽  
Kenneth L. Poff ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Sodium Nitroprusside ◽  
Red Light ◽  
Potassium Nitrate ◽  
Organic Nitrates ◽  
Phytochrome B ◽  
Phytochrome A ◽  
No Donors ◽  
Nitrogenous Compounds ◽  
Treated Seed

AbstractNitrogenous compounds, such as potassium nitrate, potentiate germination of different species of light-requiring seeds. Using light-induced Arabidopsis thaliana seed germination as a model system, our data suggested that only phytochrome A (phyA)-specific induced germination was affected after the exogenous application of nitrates, different nitric oxide (NO)-donors (such as organic nitrates) or sodium nitroprusside. The stimulative effect was very pronounced. Treated seed samples reached maximal germination after very short periods of red-light irradiation. To a far lesser extent, these substances affected phytochrome B (phyB)-specific induced germination. In phyB-specific induced germination, potassium nitrate was most effective, but germination percentages never exceeded 50%. The least effective was sodium nitroprusside, which practically did not affect phyB-specific induced germination. These results were confirmed using corresponding phytochrome mutants.

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