Up-regulation by phytochrome A of the active protochlorophyllide, Pchlide655, biosynthesis in dicots under far-red light

Sineshchekov, V.A.; Belyaeva, O. B.; Sudnitsin, A

doi:10.1016/j.jphotobiol.2004.02.001

Cited by 21 publications

(20 citation statements)

References 37 publications

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“…It is known that FR‐E light affects levels of Chl precursors (e.g. Pchlide and Chlide a ) and carotenoids (Sineshchekov et al ., ; Bou‐Torrent et al ., ). The impact of FR‐E light on photosynthetic pigments, however, varies among plant species and organs within the plant (Sineshchekov et al ., ).…”

Section: Resultsmentioning

confidence: 99%

Early physiological and biochemical responses of soyabean to neighbouring weeds under resource‐independent competition

et al. 2019

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Summary The mechanisms by which weeds compete with crop plants are poorly understood. To gain insight into these mechanisms, we characterised early physiological responses of soyabean to neighbouring weeds using a biological weedy system that generated a consistent far‐red‐enriched light environment and excluded direct resource competition. Neighbouring weeds decreased superoxide dismutase activity in unifoliate leaves. This coincided with increased hydrogen peroxide (H2O2) and oxidized ascorbate levels, while the steady‐state level of superoxide, catalase activity and lipid peroxidation remained unchanged. These responses suggested increased leaf production of singlet oxygen (1O2), which was demonstrated by detection of increased Singlet Oxygen Sensor Green (SOSG) fluorescence within 3 h after staining of unifoliate leaves. This finding was further supported by increased ratios of the photosensitiser protochlorophyllide to both chlorophyllide a, and total chlorophyll in the dark as well as enhanced sensitivity to cell death by a 1O2‐generating compound in the light. These responses coincided with dramatic changes in photosynthesis, carbon partitioning and biomass allocation with a persistent decline in leaf sucrose level and biomass production at later growth stages. This study provides direct experimental evidence that under resource‐independent competition, far‐red‐enriched light reflected by neighbouring weeds can alter the balance between ROS production and detoxification and thereby generate an oxidative stress signal in soyabean leaves.

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Section: Resultsmentioning

confidence: 99%

Early physiological and biochemical responses of soyabean to neighbouring weeds under resource‐independent competition

et al. 2019

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“…PhyA is shown to differentially regulate the synthesis of phototransformable form of Pchlide among different species (Sineshchekov et al, 2004). In Arabidopsis, there are three different forms of POR coded by PORA, PORB and PORC genes (Oosawa et al, 2000, Su et al, 2001Pattanayak and Tripathy, 2002).…”

Section: Discussionmentioning

confidence: 99%

Photoregulation of the Greening Process of Wheat Seedlings Grown in Red Light*

2005

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Wheat seedling grown with their shoot bottom exposed to red light (400 micromol m(-2) s(-1)) either with constant illumination or light-dark cycles did not accumulate chlorophyll. This near-etiolation response was manifested by a critical threshold intensity of red light and did not need continuous illumination. The inhibition of the greening process resulted from reduced synthesis of glutamate-1-semialdehyde and consequent reduction in tetrapyrrole precursor 5-aminolevulinic acid. Red light perceived by the shoot bottom down regulated the protein and/or gene expression of enzymes involved in the biosynthesis of tetrapyrroles. The contents of endogenous cytokinins, i.e., isopentenyl-adenosine and dihydrozeatinriboside, were reduced in seedlings grown in red light having their shoot bottom exposed. Application of exogenous cytokinin and its analogue to roots of seedlings grown in red light reversed the down regulation of the greening process. The reversal of red-light-induced near-etiolation morphogenesis by far-red (200 micromol m(-2) s(-1)) or blue (25 mumol m(-2) s(-1)) light suggests that it could be a very high red-irradiance response of phytochrome, in the meristematic layers of the shoot bottom, that works in concert with blue light receptor(s).

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“…Two studies dealt with this particular step of the biogenesis of the photosynthetic apparatus: Antipova et al (2004) investigated the control of LPOR accumulation in tobacco by PhyA comparing the LPOR amount in WT and phyA anti-sense transgenic mutant of tobacco. When grown in far-red (FR) radiation (λ≥680 nm), the mutant seedlings contained more than three times more Chl molecules than WT, which was able to accumulate only a very small amount of Chl due to the irradiation conditions (see Sineshchekov et al 2004). Dot-blot analysis of LPOR showed that under FR, but not in darkness, the anti-sense mutant contained more LPOR than the WT (Antipova et al 2004) confirming that PhyA regulates the lpor gene expression.…”

Section: Regulation By Radiant Energy: Sensing and Signallingmentioning

confidence: 97%

“…Dot-blot analysis of LPOR showed that under FR, but not in darkness, the anti-sense mutant contained more LPOR than the WT (Antipova et al 2004) confirming that PhyA regulates the lpor gene expression. Sineshchekov et al (2004) studied another aspect of photoactive Pchlide formation, the relative accumulation of non-photoactive and photoactive Pchlide. They showed that when grown in constant FR (λ≥720 nm), the content in non-photoactive and photoactive Pchlide in upper stems of tobacco and pea increased dramatically, while no Chl molecules accumulated.…”

Section: Regulation By Radiant Energy: Sensing and Signallingmentioning

confidence: 99%

“…These results agree with those obtained by Antipova et al (2004) (see above), but contrast with those obtained with upper stems of tomato and Arabidopsis cotyledons because in these species FR did not induce any change in the non-photoactive to photoactive Pchlide ratio. Sineshchekov et al (2004) concluded that the effect of FR on biogenesis of photoactive Pchlide is not only dependent on the species but also on the organ. The meaning of this differential regulation remains unclear and the discrepancies between the results presented in Figs.…”

Section: Regulation By Radiant Energy: Sensing and Signallingmentioning

confidence: 99%

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