scholarly journals Phytochrome A Enhances the Promotion of Hypocotyl Growth Caused by Reductions in Levels of Phytochrome B in Its Far-Red-Light-Absorbing Form in Light-Grown Arabidopsis thaliana

1996 ◽  
Vol 112 (3) ◽  
pp. 965-973 ◽  
Author(s):  
J. J. Casal
Keyword(s):  
Arabidopsis Thaliana ◽  
Red Light ◽  
Phytochrome B ◽  
Phytochrome A ◽  
Hypocotyl Growth

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.

scholarly journals Light Gradient-Based Screening of Arabidopsis thaliana on a 384-Well Type Plant Array Chip

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 191
Author(s):  
Youn-Hee Park ◽  
Je-Kyun Park
Keyword(s):  
Arabidopsis Thaliana ◽  
White Light ◽  
Solid Medium ◽  
Red Light ◽  
Phytochrome B ◽  
Wild Type ◽  
Light Gradient ◽  
Gradient Based ◽  
Light Effects ◽  
Germination And Growth

Arabidopsis thaliana (Arabidopsis), as a model for plant research, is widely used for various aspects of plant science. To provide a more sophisticated and microscopic environment for the germination and growth of Arabidopsis, we report a 384-well type plant array chip in which each Arabidopsis seed is independently seeded in a solid medium. The plant array chip is made of a poly(methyl methacrylate) (PMMA) acrylic material and is assembled with a home-made light gradient module to investigate the light effects that significantly affect the germination and growth of Arabidopsis. The light gradient module was used to observe the growth pattern of seedlings according to the intensity of the white light and to efficiently screen for the influence of the white light. To investigate the response to red light (600 nm), which stimulates seed germination, the light gradient module was also applied to the germination test. As a result, the germination results showed that the plant array chip can be used to simultaneously screen wild type seeds and phytochrome B mutant seeds on a single array chip according to the eight red light intensities.

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.

Response of the photosynthetic apparatus to UV-A and red light in the phytochrome B-deficient Arabidopsis thaliana L. hy3 mutant

2016 ◽  
Vol 54 (3) ◽  
pp. 321-330 ◽  
Author(s):  
V. D. Kreslavski ◽  
F. J. Schmitt ◽  
C. Keuer ◽  
T. Friedrich ◽  
G. N. Shirshikova ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Red Light ◽  
Photosynthetic Apparatus ◽  
Phytochrome B

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

Dual effect of phytochrome A on hypocotyl growth under continuous red light

1997 ◽  
Vol 20 (2) ◽  
pp. 261-267 ◽  
Author(s):  
M. A. MAZZELLA ◽  
T. M. ALCONADA MAGLIANO ◽  
J. J. CASAL
Keyword(s):  
Red Light ◽  
Phytochrome A ◽  
Hypocotyl Growth ◽  
Dual Effect

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
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