Phytochrome Responses to End-of-Day Irradiations in Light-grown Corn Grown in the Presence and Absence of Sandoz 9789

Gorton, Holly L.; Briggs, Winslow R.

doi:10.1104/pp.66.6.1024

Cited by 45 publications

(59 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The light treatment offers the benefit of using a uniform controlled environment to simultaneously conduct screens on large numbers of seedlings and minimizes environmental differences between control and treated plants, as only a 15-min pulse of daily FR differentiates the treatments. Previous studies have shown that coleoptile and mesocotyl tissues are responsive to EOD-FR through a LFR mode of PHY action (Gorton and Briggs, 1980). Here, we show that elongation responses, triggered by the EOD-FR treatment, are completely reversible through a PHYBmediated LFR and validated on two different inbred lines.…”

Section: Discussionmentioning

confidence: 53%

“…These low-fluence responses (LFRs) are induced or repressed by alternating R and FR treatments (Mancinelli, 1994). The LFR nature of EOD-FR in maize was previously demonstrated in 5-d-old mesocotyl and coleoptile tissues (Gorton and Briggs, 1980). The EOD-FR treatment offers several advantages over growing plants in continuous low R: FR, including exposing plants to relatively brief treatment periods, thus potentially reducing genotype 3 environment effects.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Physiological and Genetic Characterization of End-of-Day Far-Red Light Response in Maize Seedlings

et al. 2010

View full text Add to dashboard Cite

Developmental responses associated with end-of-day far-red light (EOD-FR) signaling were investigated in maize (Zea mays subspecies mays) seedlings. A survey of genetically diverse inbreds of temperate and tropical/semitropical origins, together with teosinte (Zea mays subspecies parviglumis) and a modern hybrid, revealed distinct elongation responses. A mesocotyl elongation response to the EOD-FR treatment was largely absent in the tropical/semitropical lines, but both hybrid and temperate inbred responses were of the same magnitude as in teosinte, suggesting that EOD-FR-mediated mesocotyl responses were not lost during the domestication or breeding process. The genetic architecture underlying seedling responses to EOD-FR was investigated using the intermated B73 3 Mo17 mapping population. Among the different quantitative trait loci identified, two were consistently detected for elongation and responsiveness under EOD-FR, but none were associated with known light signaling loci. The central role of phytochromes in mediating EOD-FR responses was shown using a phytochromeB1 phytochromeB2 (phyB1 phyB2) mutant series. Unlike the coleoptile and first leaf sheath, EOD-FR-mediated elongation of the mesocotyl appears predominantly controlled by gibberellin. EOD-FR also reduced abscisic acid (ABA) levels in the mesocotyl for both the wild type and phyB1 phyB2 double mutants, suggesting a FR-mediated but PHYB-independent control of ABA accumulation. EOD-FR elongation responses were attenuated in both the wild type and phyB1 phyB2 double mutants when a chilling stress was applied during the dark period, concomitant with an increase in ABA levels. We present a model for the EOD-FR response that integrates light and hormonal control of seedling elongation.

show abstract

Section: Discussionmentioning

confidence: 53%

mentioning

confidence: 99%

Physiological and Genetic Characterization of End-of-Day Far-Red Light Response in Maize Seedlings

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Phytochrome-mediated photoresponses not related to plastidogenesis, such as anthocyanin formation and induction of representative enzymes of the flavonoid biosynthesis pathway (i.e. phenylalanine ammonia lyase and chalcone synthase, Jabben and Deitzer, 1979;Reiss et al, 1983;Drurnm-Herrel et al, 1984), redifar-red reversibility of mesocotyl and hypocotyl growth inhibition (Jabben and Deitzer, 1979), as well as phytochrome responses to end-ofday irradiations (Gorton and Briggs, 1980) were not negatively affected. Even flowering could be induced in photobleached Hordeurn vulgare plants when sucrose was provided as energy source (Jabben and Deitzer, 1979).…”

Section: The Effect Of Photodamage To the Plnstids On Seedling Develomentioning

confidence: 99%

Photooxidative Destruction of Chloroplasts and Its Effect on Nuclear Gene Expression and Extraplastidic Enzyme Levels *

Oelmüller

1989

Photochem & Photobiology

202

139

View full text Add to dashboard Cite

Abstract-The cooperation between the nuclear and plastidic genome has been investigated extensively and it is generally accepted that plastidic development is controlled by the genetic information encoded in the nucleus (Ellis, 1981). It was discovered only recently that plastids are also involved in controlling extraplastidic events. If carotenoid-free plastids are destroyed by photooxidation. expression of plastidic proteins which are encoded in the nucleus is reduced or prevented. Thus is has been postulated that a signal which derives from the plastids controls the expression of these genes in the nucleus. Moreover. extraplastidic enzymes with functions related to intact plastids (such as nitrate reductase and peroxisomal enzymes) are also affected by this treatment, while (ph0to)morphogenesis and extraplastidic compounds not directly related to plastidic functions seem to be unaffected. Since the damage is restricted exclusively to the plastids and even the outer envelope membrane appears to be unimpaired, photooxidative destruction of carotenoid-free plastids is often used as a tool to investigate nuclear plastid interaction. This review briefly describes the events occurring during photodamage, analyzes the consequences for extraplastidic events, and discusses the implication of a plastidic signal(s) in controlling the expression of nuclear genes which code for plastidic proteins.

show abstract

“…Nearly complete reversal is -70C until used for RNA extraction. The R (14), FR (15), and obtained for all transcripts after 10 min (7.5 x 10-s J cm-2) of green safelight (14) sources have been described previously. Data (17).…”

mentioning

confidence: 99%

Phytochrome Control of Specific mRNA Levels in Developing Pea Buds

Kaufman¹,

Briggs²,

Thompson³

1985

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

We have examined phytochrome regulated changes in transcript abundance for 11 different light regulated mRNAs in developing pea buds. Fluence-response curves were measured for changes in transcript abundance in response to red light pulses in both the low and very low fluence ranges. Most bean (25). In Lemna it has been shown that phytochrome affects transcription of the cab and rbcS genes in isolated nuclei (23).Phytochrome regulation occurs over two fluence ranges of R (5, 7, 20). The LF response has a threshold of approximately 10' ,umol m-2 and is fully reversible by FR. This is the common phytochrome response observed in most plants. The VLF response has a threshold ofapproximately 10-3 gmol m-2. It is not reversible by FR; indeed it is induced by most FR sources (5,7,20).To date, the VLF response has only been observed in a limited number ofsystems. These include growth rates ofetiolated Avena coleoptiles and mesocotyls (3,20), anthocyanin synthesis in mustard seedlings (4), and germination of dormant lettuce seeds (6,7,24). A VLF response for Chl accumulation in peas is apparent if R of varying fluence is used as a pretreatment followed by a dark period and a subsequent white light treatment (18,22). Recently, we have also demonstrated, using etiolated pea buds, that cab transcripts have both a VLF and a LF response, whereas rbcS transcripts exhibit only a LF response (17).The mechanism whereby phytochrome regulates transcription and/or transcript abundance is unknown. In this paper, we describe the basic characteristics of phytochrome control for 11 unidentified phytochrome regulated messages and further characterize the phytochrome responses of cab and rbcS transcripts. We have measured the fluence-dependent accumulation of these transcripts in response to single pulses of R, the ability of FR to reverse these R effects, and the ability of FR to induce transcript accumulation in the absence of prior R treatments.We have also used a pretreatment protocol similar to that described above which demonstrates an effect of VLF R for Chl accumulation in a subsequent white light period (18,22

show abstract

Phytochrome Responses to End-of-Day Irradiations in Light-grown Corn Grown in the Presence and Absence of Sandoz 9789

Cited by 45 publications

References 6 publications

Physiological and Genetic Characterization of End-of-Day Far-Red Light Response in Maize Seedlings

Physiological and Genetic Characterization of End-of-Day Far-Red Light Response in Maize Seedlings

Photooxidative Destruction of Chloroplasts and Its Effect on Nuclear Gene Expression and Extraplastidic Enzyme Levels *

Phytochrome Control of Specific mRNA Levels in Developing Pea Buds

Contact Info

Product

Resources

About