The Stimulating Effect of a Cold Dark Pretreatment on the Accumulation of Components of Light-Harvesting Chlorophylla/bComplexes and on Photosynthetic Activity in Wheat (Triticum aestivum)

Botanica Acta ◽  
1993 ◽  
Vol 106 (5) ◽  
pp. 371-379 ◽  
Author(s):  
H.-G. Zwicker ◽  
R. Schulz ◽  
E. Schönbohm
Keyword(s):  
Triticum Aestivum ◽  
Photosynthetic Activity ◽  
Light Harvesting

scholarly journals Ethylene reduces glucose sensitivity and reverses photosynthetic repression through optimization of glutathione production in salt-stressed wheat (Triticum aestivum L.)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zebus Sehar ◽  
Noushina Iqbal ◽  
M. Iqbal R. Khan ◽  
Asim Masood ◽  
Md. Tabish Rehman ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Salt Stress ◽  
Photosynthetic Activity ◽  
Reduced Glutathione ◽  
Buthionine Sulfoximine ◽  
Triticum Aestivum L ◽  
Sink Strength ◽  
Glucose Sensitivity ◽  
Photosynthetic Potential ◽  
Stressful Environments

AbstractEthylene plays a crucial role throughout the life cycle of plants under optimal and stressful environments. The present study reports the involvement of exogenously sourced ethylene (as ethephon; 2-chloroethyl phosphonic acid) in the protection of the photosynthetic activity from glucose (Glu) sensitivity through its influence on the antioxidant system for adaptation of wheat (Triticum aestivum L.) plants under salt stress. Ten-day-old plants were subjected to control and 100 mM NaCl and treated with 200 µl L−1 ethephon on foliage at 20 days after seed sowing individually or in combination with 6% Glu. Plants receiving ethylene exhibited higher growth and photosynthesis through reduced Glu sensitivity in the presence of salt stress. Moreover, ethylene-induced reduced glutathione (GSH) production resulted in increased psbA and psbB expression to protect PSII activity and photosynthesis under salt stress. The use of buthionine sulfoximine (BSO), GSH biosynthesis inhibitor, substantiated the involvement of ethylene-induced GSH in the reversal of Glu-mediated photosynthetic repression in salt-stressed plants. It was suggested that ethylene increased the utilization of Glu under salt stress through its influence on photosynthetic potential and sink strength and reduced the Glu-mediated repression of photosynthesis.

scholarly journals Photosynthetic activity of Triticum dicoccum × Triticum aestivum alloplasmic lines during vegetation in connection with productivity traits under varying moister conditions

2021 ◽  
Vol 59 (1) ◽  
pp. 74-83
Author(s):  
N.V. TERLETSKAYA ◽  
V.YU. STUPKO ◽  
N.A. ALTAYEVA ◽  
N.O. KUDRINA ◽  
I.V. BLAVACHINSKAYA ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Photosynthetic Activity ◽  
Alloplasmic Lines ◽  
Triticum Dicoccum

scholarly journals UV-B photoreceptor-mediated protection of the photosynthetic machinery inChlamydomonas reinhardtii

2016 ◽  
Vol 113 (51) ◽  
pp. 14864-14869 ◽  
Author(s):  
Guillaume Allorent ◽  
Linnka Lefebvre-Legendre ◽  
Richard Chappuis ◽  
Marcel Kuntz ◽  
Thuy B. Truong ◽  
...  
Keyword(s):  
Photosynthetic Activity ◽  
Light Harvesting ◽  
Nonphotochemical Quenching ◽  
High Light ◽  
Light Energy ◽  
Light Harvesting Complex ◽  
Subsequent Exposure ◽  
Photosynthetic Machinery ◽  
Life On Earth ◽  
Energy Dependent

Life on earth is dependent on the photosynthetic conversion of light energy into chemical energy. However, absorption of excess sunlight can damage the photosynthetic machinery and limit photosynthetic activity, thereby affecting growth and productivity. Photosynthetic light harvesting can be down-regulated by nonphotochemical quenching (NPQ). A major component of NPQ is qE (energy-dependent nonphotochemical quenching), which allows dissipation of light energy as heat. Photodamage peaks in the UV-B part of the spectrum, but whether and how UV-B induces qE are unknown. Plants are responsive to UV-B via the UVR8 photoreceptor. Here, we report in the green algaChlamydomonas reinhardtiithat UVR8 induces accumulation of specific members of the light-harvesting complex (LHC) superfamily that contribute to qE, in particular LHC Stress-Related 1 (LHCSR1) and Photosystem II Subunit S (PSBS). The capacity for qE is strongly induced by UV-B, although the patterns of qE-related proteins accumulating in response to UV-B or to high light are clearly different. The competence for qE induced by acclimation to UV-B markedly contributes to photoprotection upon subsequent exposure to high light. Our study reveals an anterograde link between photoreceptor-mediated signaling in the nucleocytosolic compartment and the photoprotective regulation of photosynthetic activity in the chloroplast.

scholarly journals Growth and Photosynthetic Activity of Selected Spelt Varieties (Triticum aestivum ssp. spelta L.) Cultivated under Drought Conditions with Different Endophytic Core Microbiomes

2020 ◽  
Vol 21 (21) ◽  
pp. 7987
Author(s):  
Karolina Ratajczak ◽  
Hanna Sulewska ◽  
Lidia Błaszczyk ◽  
Aneta Basińska-Barczak ◽  
Katarzyna Mikołajczak ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Common Wheat ◽  
Mycorrhizal Fungi ◽  
Dry Matter ◽  
Photosynthetic Activity ◽  
Wheat Variety ◽  
Dry Matter Accumulation ◽  
Isolation And Identification ◽  
Core Microbiome ◽  
Drought Conditions

The role of the microbiome in the root zone is critically important for plants. However, the mechanism by which plants can adapt to environmental constraints, especially water deficit, has not been fully investigated to date, while the endophytic core microbiome of the roots of spelt (Triticum aestivum ssp. spelta L.) grown under drought conditions has received little attention. In this study, we hypothesize that differences in the endophytic core of spelt and common wheat root microbiomes can explain the variations in the growth and photosynthetic activity of those plants, especially under drought conditions. Our greenhouse experimental design was completely randomized in a 2 × 4 × 3 factorial scheme: two water regime levels (well-watered and drought), three spelt varieties (T. aestivum ssp. spelta L.: ‘Badenstern’, ‘Badenkrone’ and ‘Zollernspelz’ and one wheat variety: T. aestivum ssp. vulgare L: ‘Dakotana’) and three mycorrhizal levels (autoclaved soil inoculation with Rhizophagus irregularis, control (autoclaved soil) and natural inoculation (non-autoclaved soil—microorganisms from the field). During the imposed stress period, relative water content (RWC), leaf chlorophyll fluorescence, gas exchange and water use efficiency (WUE) were measured. Microscopic observations of the root surface through fungi isolation and identification were conducted. Our results indicate that ‘Badenstern’ was the most drought tolerant variety, followed by ‘Zollernspelz’ and ‘Badenkrone,’ while the common wheat variety ‘Dakotana’ was the most drought sensitive. Inoculation of ‘Badenstern’ with the mycorrhizal fungi R. irregularis contributed to better growth performance as evidenced by increased whole plant and stalk dry matter accumulation, as well as greater root length and volume. Inoculation of ‘Zollernspelz’ with arbuscular mycorrhizal fungi (AMF) enhanced the photochemical efficiency of Photosystem II and significantly improved root growth under drought conditions, which was confirmed by enhanced aboveground biomass, root dry weight and length. This study provides evidence that AMF have the potential to be beneficial for plant growth and dry matter accumulation in spelt varieties grown under drought conditions.

scholarly journals Responses of Wheat (Triticum Aestivum L.) and Maize (Zea Mays L.) Plants to Cadmium Toxicity in Relation to Magnesium Nutrition

2014 ◽  
Vol 73 (2) ◽  
pp. 359-373 ◽  
Author(s):  
Nataša Nikolić ◽  
Slobodanka Pajević ◽  
Milan Župunski ◽  
Mirjana Topić ◽  
Danijela Arsenov
Keyword(s):  
Triticum Aestivum ◽  
Zea Mays ◽  
Considerable Increase ◽  
Photosynthetic Activity ◽  
Cadmium Toxicity ◽  
Triticum Aestivum L ◽  
Carotenoid Concentration ◽  
Physiological Processes ◽  
Leaf Chlorophyll ◽  
Negative Effect

AbstractThe influence of cadmium (Cd) on physiological processes in wheat (Triticum aestivumL.) and maize (Zea maysL.) plants exposed to either optimal mineral nutrition or the absence of magnesium (Mg) as well as the accumulation of cadmium and magnesium in plant organs were studied using the method of water culture in a greenhouse. Cd treatment reduced shoot fresh mass more strongly in Mg-supplied than in Mg-deficient plants. Negative effect of Cd on photosynthetic activity was more pronounced inT. aestivumthan inZ. maysplants. Cd treatment decreased leaf chlorophyll and carotenoid concentration in bothZ. maysandT. aestivum,irrespective of the Mg supply. Cd was preferentially accumulated in the roots of both species. Catalase activity inT. aestivumleaves and roots was unaffected by Cd and Mg supply. Cd treatment did not affect Fe accumulation in the leaves of either species, while in the roots a considerable increase occurred, irrespective of the Mg nutrition. Higher tolerance ofZ. maysandT. aestivumplants to Cd toxicity exposed to Mg deficiency could partly be ascribed to the preservation of Fe nutrition.

scholarly journals Photosynthetic activity of Daucus carota L. subsp. sativus (Hoffm.) Schübl. & G. Martens and Triticum aestivum L. in the presence of copper and vanadium ions

2018 ◽  
Author(s):  
Iwona Konieczna ◽  
Grzegorz Rut ◽  
Angelika Kliszcz
Keyword(s):  
Heavy Metal ◽  
Triticum Aestivum ◽  
Metal Ions ◽  
Daucus Carota ◽  
Chlorophyll A Fluorescence ◽  
Heavy Metal Ions ◽  
Photosynthetic Activity ◽  
Triticum Aestivum L ◽  
Daucus Carota L ◽  
Vanadium Ions

The aim of this study was to investigate the influence of copper and vanadium ions on photosynthetic activity of carrot (Daucus carota L. subsp. sativus (Hoffm.) Schübl. & G. Martens) and winter wheat (Triticum aestivum L.). Measurements of the total chlorophyll content were performed – the SPAD chlorometer and the basic chlorophyll a fluorescence parameters were determined using the FMS-1 fluorometer – Hansatech. The studies used aqueous solutions of copper salt (CuSO4) and vanadium (H4NO3V), with molar concentrations: 0.6 mM, and 3 mM. The control group consisted of plants watered with distilled water. Both in carrots and in wheat, together with an increase in the concentration of heavy metal ions, a decrease in the content of chlorophyll was observed and significant changes in the activity of the photosystem were demonstrated II. Measurements of chlorophyll fluorescence kinetics and only in D. carota subsp. sativus showed a statistically significant effect of 3 mM solutions of copper and vanadium ions on photosynthetic activity. In T. aestivum none of the heavy metal ions induced significant changes in the values of chlorophyll a fluorescence.

Synchronization and photosynthetic activity of a Scenedesmus mutant lacking the light-harvesting system

1993 ◽  
Vol 88 (1) ◽  
pp. 135-140 ◽  
Author(s):  
H. Senger ◽  
E. Schrader ◽  
J. Burger ◽  
U. Langheinrich ◽  
N. I. Bishop
Keyword(s):  
Photosynthetic Activity ◽  
Light Harvesting

Effect of different light on wheat (Triticum aestivum L) growth and role of phytochrome

2020 ◽  
Vol 1 (1) ◽  
pp. 01-05
Author(s):  
Kanwal Iqbal
Keyword(s):  
Triticum Aestivum ◽  
Light Harvesting ◽  
Abiotic Factors ◽  
Triticum Aestivum L ◽  
Fresh Weight ◽  
Wheat Varieties ◽  
Seedling Biomass ◽  
Root And Shoot Length ◽  
Model Plant Arabidopsis Thaliana

Among the various naturally occurring abiotic factors regulating plant development, different types of light play an important role in them. Photosynthesis, photoperiodism, and photo morphogenesis. In this trial the effects of different colors of light on (seed) germination, phytochrome conversion, length of seedling, biomass production in wheat varieties Shalkot and Tandojam. The rate of germination data indicates white 96%, Red 100%, far-red 95%, Blue 95%, and dark 64%, in Shalkot. In Tandojam rate of germination 94% White, 93% red, 82% far red, 92% blue, and 50% dark, were observed. Root and shoot length were higher in Shalkot under white light. Difference between dry and fresh weight in Shalkot under white, red, far-red, blue, dark, 1.66g, 0.94g, 0.98g, 0.97g, 0.6g, respectively. In Tandojam difference between dry and fresh weight observed under white, red, far-red, blue, dark, 1.48g, 0.92g, 0.70g, 0.97g, 0.4g respectively. By using bioinformatics tools identified some light-harvesting genes in wheat (Triticum aestivum) by using model plant Arabidopsis thaliana. The identified light-harvesting genes include cl02879, cl25816, cl33336, cl31857, cl28913.

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