Impact of increasing Ultraviolet-B (UV-B) radiation on photosynthetic processes

Kataria, Sunita; Jajoo, Anjana; Guruprasad, K. N.

doi:10.1016/j.jphotobiol.2014.02.004

Cited by 293 publications

(183 citation statements)

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“…It is widely recognized that UV-B exposure causes the accumulation of ROS in plant leaves (Hideg et al, 2002;Kataria et al, 2014). The enhanced accumulation of H 2 O 2 in atg mutants after UV-B damage further suggested that ROS accumulation is involved in the regulation of chlorophagy.…”

Section: Induction Of Chlorophagy Involves the Accumulation Of Ros Rementioning

confidence: 99%

“…UV-B (wavelengths between 280 and 315 nm) is the most energetic and shortest wavelength light reaching the surface of the Earth (x-rays and gamma rays are blocked by the Earth's atmosphere). Although UV-B is ineffective for photosynthesis, it is directly absorbed by intracellular macromolecules such as proteins, lipids and DNA, causing them damage and ultimately inhibiting photosynthesis (Kataria et al, 2014). In addition, excess PAR (wavelengths between 400 and 700 nm) causes photodamage to the chloroplast apparatus and decreases photosynthetic capacity, a phenomenon termed photoinhibition (Sonoike, 1998;Li et al, 2009;Takahashi and Badger, 2011;Tikkanen et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Photodamaged chloroplasts and chloroplast proteins must be eliminated or repaired both to maintain optimal chloroplast function and to avoid further cellular damage. Plants have diverse and highly controlled mechanisms to avoid, relieve, or repair chloroplast photodamage (Sonoike, 1998;Asada, 2006;Li et al, 2009;Kato and Sakamoto, 2010;Takahashi and Badger, 2011;Kataria et al, 2014;Kong and Wada, 2014;Nishimura and van Wijk, 2015). However, to date, the mechanism by which entire damaged chloroplasts are removed has remained poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

et al. 2017

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ORCID IDs: 0000-0001-5222-9163 (M.I.); 0000-0002-8682-4566 (H.I.); 0000-0002-8218-6894 (S.N.); 0000-0002-3798-8257 (J.H.)Turnover of dysfunctional organelles is vital to maintain homeostasis in eukaryotic cells. As photosynthetic organelles, plant chloroplasts can suffer sunlight-induced damage. However, the process for turnover of entire damaged chloroplasts remains unclear. Here, we demonstrate that autophagy is responsible for the elimination of sunlight-damaged, collapsed chloroplasts in Arabidopsis thaliana. We found that vacuolar transport of entire chloroplasts, termed chlorophagy, was induced by UV-B damage to the chloroplast apparatus. This transport did not occur in autophagy-defective atg mutants, which exhibited UV-Bsensitive phenotypes and accumulated collapsed chloroplasts. Use of a fluorescent protein marker of the autophagosomal membrane allowed us to image autophagosome-mediated transport of entire chloroplasts to the central vacuole. In contrast to sugar starvation, which preferentially induced distinct type of chloroplast-targeted autophagy that transports a part of stroma via the Rubisco-containing body (RCB) pathway, photooxidative damage induced chlorophagy without prior activation of RCB production. We further showed that chlorophagy is induced by chloroplast damage caused by either artificial visible light or natural sunlight. Thus, this report establishes that an autophagic process eliminates entire chloroplasts in response to light-induced damage.

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Section: Induction Of Chlorophagy Involves the Accumulation Of Ros Rementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

et al. 2017

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“…High doses of UV-B can cause oxidative stress in plants through the development of reactive oxygen species (ROS) which can cause damage to lipids and proteins [8]. UV-B radiation can affect photosynthesis by degrading core proteins (D1 and D2) of photosystem II, inactivating rubisco, altering stomatal conductance, and inducing changes in photosynthetic pigments [9]. Stress caused by UV-B radiation can have compounded effects when another stressor is present such as drought or nutrient deficiency [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Stress Responses of Peanut (<i>Arachis hypogaea</i> L.) Genotypes as Measured by Trigonelline Content after Exposure to UV-B Radiation

Willmon¹,

Devireddy²,

Inupakutika³

et al. 2017

AJPS

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UV-B radiation has been widely documented as a stressor for plants that can cause decreased biomass, reduction in photosynthesis, and oxidative stress. Trigonelline is a secondary metabolite that is biosynthesized in some plants in response to abiotic stress such as UV-B irradiation. The objectives of this study were to examine biochemical stress responses for peanut plants (Arachis hypogaea L.) of four different genotypes (Spanish, Valencia, Virginia, and Runner) after exposure at various lengths to UV-B radiation and to examine the alteration of trigonelline biosynthesis due to the age of the plants. Peanut plants from the genotypes were exposed to UV-B radiation at three exposure times (60, 120, and 180 min); plants from two growth stages, the flowering (R1) and early maturity (R7), were used. Significant positive correlations (r s 0.29 -0.74, P ≤ 0.05) were found for trigonelline concentrations and UV-B exposure times. With longer exposure times of 180 min for plants at R7, trigonelline biosynthesis began as early as 10 days after treatment with 154.6 μg·g −1 DW and remained or increased by up to 71.5 μg•g −1 DW (46.3%) throughout the sampling intervals (10,20,30,40, and 50 days after treatment) to a final value of 226.1 μg•g −1 DW. All four genotypes at R7 exhibited trigonelline concentrations 47.3% to 52.4% (71.6 to 96.5 μg·g −1 DW) higher than individuals at R1. Trigonelline biosynthesis at R7 was significantly (P < 0.05) affected by all levels of UV-B exposure, whereas trigonelline concentrations at R1 were significantly influenced (P < 0.05) by only the longer exposure times (120 and 180 min). No statistically significant difference was found in trigonelline concentration among the four different genotypes. UV-B irradiation had the greatest effect on plants at R7 after 120 and 180 min of exposure, as 15 out of 20 (75%) individuals had significantly higher (P < 0.05) trigonelline

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“…UV that reaches the mesophyll can affect photosynthetic apparatus in similar fashion to excess radiation of longer wavelengths, in particular via accumulation of reactive oxygen species (ROS) in the thylakoid membrane (Foyer et al, 1994) and/or by inhibiting repair of PSII (Nishiyama et al, 2006). At the cellular level, UV wavelengths can exacerbate oxidative stress (Barta et al, 2004;Snyrychova et al, 2007) via the formation of oxygen radicals from peroxidases and oxidases, chlorophyll molecules and metabolic reactions in peroxisomes, as well as in the electron transport chain (for reviews see Kataria et al, 2014;and Czégény et al, 2016). UV radiation also promotes the production of hydrogen peroxide (H 2 O 2 ), the stable form of oxidized oxygen, and its subsequent photosensitive breakdown to highly oxidizing hydroxyl radical (Czégény et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Solar UV Upregulates Photoprotection but Slows Photosynthesis in Subalpine Australian Plants

Salter

Turnbull

Rennenberg

et al. 2017

Arctic, Antarctic, and Alpine Research

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Impact of increasing Ultraviolet-B (UV-B) radiation on photosynthetic processes

Cited by 293 publications

References 158 publications

Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

Stress Responses of Peanut (<i>Arachis hypogaea</i> L.) Genotypes as Measured by Trigonelline Content after Exposure to UV-B Radiation

Solar UV Upregulates Photoprotection but Slows Photosynthesis in Subalpine Australian Plants

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Impact of increasing Ultraviolet-B (UV-B) radiation on photosynthetic processes

Cited by 293 publications

References 158 publications

Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

Entire Photodamaged Chloroplasts Are Transported to the Central Vacuole by Autophagy

Stress Responses of Peanut (&lt;i&gt;Arachis hypogaea&lt;/i&gt; L.) Genotypes as Measured by Trigonelline Content after Exposure to UV-B Radiation

Solar UV Upregulates Photoprotection but Slows Photosynthesis in Subalpine Australian Plants

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Stress Responses of Peanut (<i>Arachis hypogaea</i> L.) Genotypes as Measured by Trigonelline Content after Exposure to UV-B Radiation