Differential degradation of photosystem I subunits under iron deficiency in rice

Yadavalli, Venkateswarlu; Neelam, Satyabala; Rao, A. S.; Reddy, A. Ramachandra; Subramanyam, Rajagopal

doi:10.1016/j.jplph.2012.02.008

Cited by 62 publications

(32 citation statements)

References 49 publications

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“…Under Fe deficiency, the FeE genotypes showed stronger antioxidant capacity than the FeI genotypes, as reflected by the higher SOD, POD, and CAT activities obtained for the FeE genotypes (Table 2). Plants with greater SOD activity in leaf tissues have been shown to efficiently remove reactive oxygen species (ROS) and minimize or prevent ROS‐induced damage (Yadavalli et al, 2012). Iron‐induced membrane injury of chloroplasts occurs as a result of increased ROS scavenging ability, which protects PSII from oxidative stress.…”

Section: Discussionmentioning

confidence: 99%

Physiological Regulation Associated with Differential Tolerance to Iron Deficiency in Soybean

et al. 2018

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Iron deficiency has become a yield‐limiting factor in many agricultural areas. This study was conducted to elucidate the relationship between physiological traits and soybean [Glycine max (L.) Merr.] tolerance in the presence of different FeEDTA concentrations. Two hydroponic experiments using prescreened Fe‐efficient (FeE) and Fe‐inefficient (FeI) soybean genotypes were performed in 2014 and 2015, respectively. Various chlorophyll fluorescence parameters, antioxidant enzyme activities, and the dry weight of the plants were determined and analyzed by canonical correlation analysis, stepwise regression, and logistic equation. The effective quantum yield of photosystem II (PSII) (PhiPSII), maximal photochemical efficiency of PSII (Fv/Fm), superoxide dismutase (SOD), and peroxidase (POD) activity of the FeE genotypes were significantly higher than those of the FeI genotypes (P < 0.05). High catalase (CAT) and POD activities could improve photoprotection and PhiPSII under Fe deficiency. High POD and CAT activities and high Fv/Fm are conducive to increasing the chlorophyll content of E genotypes, and high CAT activity and longer ∆t are also conducive to increasing dry matter accumulation in FeE genotypes under Fe deficiency. In particular, in the presence of 0.02 mM FeEDTA, FeE genotypes exhibit higher PhiPSII, electron transport rate (ETR), and Fv/Fm values as well as higher SOD, POD, and CAT activities than FeI genotypes. Moreover, FeE genotypes show greater dry matter accumulation because of the longest ∆t in the presence of 0.02 mM FeEDTA. Thus, FeE genotypes have stronger tolerance to Fe deficiency because of their higher antioxidant, photochemical, and photoprotection abilities as well as their increased dry matter accumulation resulting from their longer ∆t in the presence of 0.02 mM FeEDTA.

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Section: Discussionmentioning

confidence: 99%

Physiological Regulation Associated with Differential Tolerance to Iron Deficiency in Soybean

et al. 2018

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“…In oxygenic photosynthesis, Fe is a cofactor in both photosystems (PSII and PSI) and in the cytochrome (Cyt) b 6 /f complex. Moreover, it is required for chlorophyll biosynthesis and to promote the structural integrity of photosynthetic reaction centers and light-harvesting complex (LHC) subunits (Guerinot and Yi, 1994;Msilini et al, 2011;Yadavalli et al, 2012). However, the same redox properties that make Fe suitable to the electron transfer chain in photosynthesis is also responsible for its toxic effects when it is present in excess because of reactive oxygen species (ROS) overproduction (Kobayashi and Nishizawa, 2012).…”

Section: Introductionmentioning

confidence: 99%

Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron

Pinto

Souza

Oliva

et al. 2016

Sci. agric. (Piracicaba, Braz.)

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Iron plays a pivotal role in the redox reactions of photosynthesis and metabolic processes such as chlorophyll synthesis. Iron availability in waterlogged soils can reach toxic levels and promote oxidative stress. Fe toxicity is the most concerning of stresses for rice in many lowland environments around the world and may cause severe impairments in rice photosynthesis. This study aimed to investigate the extension of oxidative stress after excess Fe exposure and its effects on the photosynthesis of rice cultivars with differential sensitivity. Three Brazilian rice cultivars (EPAGRI 107, BRSMG SELETA and BR IRGA 409) were grown in Hoagland nutrient solution (pH 4.0) with two Fe-EDTA doses corresponding to excess Fe (7 mM) and control (0.009 mM) treatments. After just three days of excess Fe exposure, there was a significant increase in iron concentration in the shoots. The BR IRGA 409 cultivar exhibited higher Fe accumulation in its shoots, and the EPAGRI 107 cultivar recorded the lowest values, which were below the critical toxicity level, as a resistance strategy. Impairment in light energy partitioning and oxidative damage became evident before changes in stomatal resistance, chlorophyll content, maximal PSII quantum yield or visual symptoms for the most sensitive cultivar (BR IRGA 409). The photosynthesis limitations, in addition to the impairment of excess energy dissipation in rice from iron toxicity, are the results of oxidative damage.

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“…In addition to macronutrients, it has been reported that the level of micronutrients also affected the biomass production and chemical constituents of plants in hydroponic-based cultures (Jin et al, 2013). Micronutrients such as iron and zinc are essential for the synthesis of metabolite compounds because they are components of many enzymes associated with the energy transfer, nitrogen reduction and fixation, and lignin formation (Luo et al, 2012;Yadavalli et al, 2012;Jin et al, 2013). The deficiency or excess of micronutrients significantly reduce plant biomass and secondary metabolite production (Luo et al, 2012;Jin et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of changes in the growth and chemical constituents of Anoectochilus formosanus Hayata grown under hydroponic conditions

Nguyen¹,

Nhu²,

Dung³

et al. 2018

bta

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Anoectochilus formosanus Hayata is an important medicinal plant with various pharmaceutical properties. In this study, A. formosanus plants were hydroponically cultivated in different nutrient solutions to achieve enhanced biomass and secondary metabolites production. Three months-old A. formosanus plants were grown for 8 weeks under controlled environment in plastic pots containing Murashige and Skoog (MS), Nitrophoska Foliar (NF), Hydro Green (HG), or Hydro Bee (HB) media. Among 4 nutrient solutions tested, HB was the most efficient medium for the plant growth with the highest fresh weight (FW, 2.56 g/plant) and dry weight (DW, 0.18 g/plant) values. The results of phytochemical screening showed the presence of alkaloids, flavonoids, terpenoids, glycosides, and steroids in the extracts of A. formosanus cultivated in HB, HG, and MS medium. The level of these compounds was significantly different in plants cultivated in tested media. The highest alkaloids (34.87 μg/g DW) and terpenoids (56.43 μg/g DW) contents were obtained on HG medium, whereas flavonoids were present in highest amounts (90.13 μg QE/g DW) in plants grown in NF medium. On the other hand, HB medium stimulated the production of the highest glycoside (64.33 μg/g DW) and steroids (22.83 μg/g DW) levels. The antioxidant activity of the extracts was also tested using the 1,1-Diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity assay and the results demonstrated strong antioxidant activities of A. formosanus extracts with IC 50 of 136.19 to 248.85 μg/ml. Concluding, the hydroponic-cultivation of A. formosanus is a promising way for obtaining highly valuable compounds for pharmaceutical and nutraceutical industries.

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Differential degradation of photosystem I subunits under iron deficiency in rice

Cited by 62 publications

References 49 publications

Physiological Regulation Associated with Differential Tolerance to Iron Deficiency in Soybean

Physiological Regulation Associated with Differential Tolerance to Iron Deficiency in Soybean

Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron

Evaluation of changes in the growth and chemical constituents of Anoectochilus formosanus Hayata grown under hydroponic conditions

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