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Light Suppression of Nitrate Reductase Activity in Seedling and Young Plant Tissues Mark A

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Light Suppression of Nitrate Reductase Activity in Seedling and Young Plant Tissues Mark A University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Transactions of the Nebraska Academy of Sciences Nebraska Academy of Sciences and Affiliated Societies 10-23-2015 Light suppression of nitrate reductase activity in seedling and young plant tissues Mark A. Schoenbeck University of Nebraska at Omaha, [email protected] Bikash Shrestha University of Nebraska at Omaha, [email protected] Melanie F. McCormick University of Nebraska at Omaha, [email protected] Timothy D. Kellner University of Nebraska at Omaha, [email protected] Claudia M. Rauter University of Nebraska at Omaha, [email protected] Follow this and additional works at: http://digitalcommons.unl.edu/tnas Part of the Plant Sciences Commons Schoenbeck, Mark A.; Shrestha, Bikash; McCormick, Melanie F.; Kellner, Timothy D.; and Rauter, Claudia M., "Light suppression of nitrate reductase activity in seedling and young plant tissues" (2015). Transactions of the Nebraska Academy of Sciences and Affiliated Societies. 477. http://digitalcommons.unl.edu/tnas/477 This Article is brought to you for free and open access by the Nebraska Academy of Sciences at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Transactions of the Nebraska Academy of Sciences and Affiliated Societies by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Light suppression of nitrate reductase activity in seedling and young plant tissues Mark A. Schoenbeck,* Bikash Shrestha, Melanie F. McCormick, Timothy D. Kellner, and Claudia M. Rauter Biology Department, University of Nebraska at Omaha, 6001 Dodge St., Omaha, NE 68182-0040 * Correspondence: Mark A. Schoenbeck, Biology Department, University of Nebraska at Omaha, 6001 Dodge St., Omaha, NE 68182-0040; tel: (402)554-2390; email: [email protected] Abstract Light is often reported to enhance plant nitrate reductase (NR) activity; we have identified a context in which light strongly sup- presses NR activity. In vivo NR activity measurements of laboratory-grown seedlings showed strong suppression of nitrate-induced NR activity in cotyledon, hypocotyl, and root tissues of Ipomoea hederacea (L.) Jacquin; robust NR activity accumulated in nitrate-in- duced tissues in the dark, but was absent or significantly reduced in tissues exposed to light during the incubation. The suppres- sive mechanism appears to act at a point after nitrate perception; tissues pre-incubated with nitrate in the light were potentiated and developed NR activity more rapidly than nitrate-induced tissues not so pre-exposed. Suppression was affected by moderate to low light levels under full-spectrum light sources and by single-wavelength red, green, and blue sources. The suppression phenom- enon persisted in early (first through fourth) leaves of glasshouse plants grown in soil, and in artificially rejuvenated cotyledons. Collectively these observations suggest a link between light perception and NR regulation that remains to be fully characterized. Keywords: plant, nitrate, reductase, regulation, suppression, light Introduction onstrated to contribute qualitatively and quantitatively Living systems employ reductive enzymes for a range to nitrate-dependent induction (Lin et al. 1994, Wang et of processes; important among these is the acquisition of al. 2010, Konishi and Yanagisawa 2011). Examination of - nutrients from inorganic pools. Nitrate (NO3 ) -- the ma- the relative abundance of transcripts from two NR-encod- jor form of inorganic nitrogen available to plants in the ing isogenes of Brassica napus revealed distinct nitrate-in- environment -- must be reduced to ammonium (Guer- dependent accumulation patterns associated with differ- rero, Vega and Losada 1981) prior to its assimilation into ent developmental stages and tissue types in microspore the amino acid pool via either the glutamine synthetase/ culture-derived embryos (Fukuoka et al. 1996). NR activ- glutamate synthase cycle or the action of glutamate de- ity is modulated post-translationally through regulatory hydrogenase (Lam et al. 1995). The initial step of nitrate phosphorylation (Su, Huber and Crawford 1996) permit- reduction is mediated by nitrate reductase (NR), which ting the association of a 14-3-3 family protein that alters - generates nitrite (NO2 ). Nitrite is subsequently reduced to electron flow through the enzyme’s modular structure ammonium by nitrite reductase. While the occurrence of (Lambeck et al. 2012); this feature appears to be widely nitrate-reducing activities in plant tissues has been known conserved among flowering plants (Bachman et al. 1996) for more than a century (Irving and Hankison, 1908) their and may have emerged prior to the divergence of Mag- mechanisms and physiological roles (Campbell 1999), ge- noliophyta (Nemie-Feyissa et al. 2013). Evidence has also netics (Hirel et al. 2001), modes of regulation (Lillo et al. been provided for regulation through degradation of the 2004, Lillo 2008), and potential for improvement in the NR protein (Gupta and Beevers 1984, Somers et al. 1983). context of nitrogen use efficiency (Zhao, Nie and Xiao Factors to which NR regulatory mechanisms are re- 2013) have been the foci of ever increasing numbers of in- sponsive include developmental state (Fukuoka et al. vestigations. Beyond assimilation, nitrate reduction plays 1996), available nitrate (Hageman and Flesher 1960), an important role in the synthesis of nitric oxide, a mole- metabolic status (Botrel and Kaiser 1997, Vincentz et al. cule recognized as mediating signal transduction in plants 1993), moisture and pathogen stresses (Bardzik, Marsh and animal systems (Desikan et al. 2002). and Havis 1971, Yamamoto et al. 2003), plant growth reg- Because N assimilation entails both energetic and met- ulators (Lu, Ertl and Chen 1990, Zhang et al. 2011) and abolic costs in the forms of reducing equivalents and car- light (Duke and Duke 1984, Huber et al. 1992b, Lillo 1994). bon skeletons, respectively, it is to be anticipated that Light is most often reported to have an enhancing effect associated processes are physiologically regulated and on NR activity, and this enhancement may be either the sensitive to the plant’s status. Multiple levels and mech- direct result of light perception (Rajasekhar, Gowri and anisms of regulation have been reported to impact NR Campbell 1988), or through stimulation by the products activity in plants. At the transcriptional level, promoter of photosynthesis (Cheng et al. 1992). In addition, light en- sequences and other functional elements associated with trains the plant’s circadian rhythm, which has been pro- the Arabidopsis NR-encoding NIA1 gene have been dem- posed to influence the cyclic accumulation of NR tran- 2015 Transactions of the Nebraska Academy of Sciences 35, 41–52 41 Light suppression of seedling nitrate reductase script in anticipation of daylight, and corresponding fluorescent tubes (General Electric). Light intensity was decrease as night approaches (Lillo and Ruoff 1989, Deng controlled by shading the boxes with sheets of white pa- et al. 1990), though whether this modulation is necessar- per. Light intensity was measured by placing a photom- ily integrated with the cell’s central diurnal timekeeping eter in the same location as the box. function, termed the “central oscillator,” has been called into question (Lillo, Meyer and Ruoff 2001). In contrast to Induction and light treatments evidence for an enhancing effect, the potential for photo- Live tissue samples were harvested from seedlings or receptor-mediated negative impacts of light on NR activ- more developed plants for light and nitrate treatments. ity levels has been suggested in limited cases (Rajasekhar, Cotyledons were separated from each other, and the seed- Gowri and Campbell 1988) with far red treatments revers- ling root was separated from the hypocotyl, which was ing red light stimulation of NR activity in etiolated squash typically cut into approximately 1 cm sections. Nitrate cotyledons and red light suppression of cotyledon NR in reductase activity was induced by the infiltration of ni- intact seeds of Cicer arietinum, though not in excised tis- trate-containing buffer. Both control (non-induced) and sues (Bueno et al. 1996). treatment (induced) tissues were placed in the wells of In the course of examining the carbon and nitrogen 12-well microtiter plates, with a single sample (cotyledon metabolic physiology of the twining forb Ipomoea hedera- pair, hypocotyl, or root) per well. Tissues were immersed cea (L.) Jacquin (ivyleaf morning glory), we noted novel in 2 mL volumes of potassium phosphate buffer (50 mM, patterns of nitrate reductase activity in seedling tissues. pH 6.5) with or without potassium nitrate amendments. Contrarily to the often-reported enhancement of NR ac- Tissues were vacuum infiltrated by placing the sample tivity by light exposure, we found a robust suppression plate in a vacuum chamber and drawing a vacuum un- of nitrate-dependent induction, even at low light levels, til air bubbles were seen to emerge from the tissues. Cot- in both laboratory-grown seedling root and shoot tissues yledons (abaxial side up) were held submerged by small and in young glasshouse-grown plants. Our objective, glass weights, which were removed subsequent to infil- therefore, was to characterize the nature of this phenom- tration. Infiltrated tissues (a minimum of eight repetitions enon with respect to the relative timing of nitrate-medi- per treatment)
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