Impact of UV‐B Exposure on Phytochrome and Photosynthetic Machinery

Yadav, Shivam; Shrivastava, Alok Kumar; Agrawal, Chitranjan; Sen, Sonia; Chatterjee, Antra; Rai, Shweta; Rai, Ruchi; Singh, Shilpi; Rai, L.C.

doi:10.1002/9781119143611.ch13

Cited by 5 publications

(3 citation statements)

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“…Photosynthesis is one of the most sensitive metabolic processes in plants responding to environmental condition changes, such as supplemental UV-B radiation and PPFD. In the present study, P n in basil leaves was lower after UV-B radiation, which was mainly caused by the direct damage of PSII components and led to reduced photosynthetic capacity, subsequently decreased G s [32][33][34]. Meanwhile, relative chlorophyll content in basil leaves was also lower after UV-B radiation, either through degradation or inhibition of enzymes involved in the chlorophyll biosynthetic pathways [34].…”

Section: Impacts Of Uv-b and Ppfd On Photosynthesis Relative Chloropmentioning

confidence: 42%

“…In the present study, P n in basil leaves was lower after UV-B radiation, which was mainly caused by the direct damage of PSII components and led to reduced photosynthetic capacity, subsequently decreased G s [32][33][34]. Meanwhile, relative chlorophyll content in basil leaves was also lower after UV-B radiation, either through degradation or inhibition of enzymes involved in the chlorophyll biosynthetic pathways [34]. However, compared to depressed photosynthesis and reduced chlorophyll content by supplemental UV-B radiation in our study, a meta-analysis of field studies (more than 450 reports from 62 papers) reported unaffected photosynthesis and chlorophyll content after supplemental UV-B radiation [35].…”

Section: Impacts Of Uv-b and Ppfd On Photosynthesis Relative Chloropmentioning

confidence: 44%

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Pre-Harvest UV-B Radiation and Photosynthetic Photon Flux Density Interactively Affect Plant Photosynthesis, Growth, and Secondary Metabolites Accumulation in Basil (Ocimum basilicum) Plants

Dou

Niu

Gu³

2019

Agronomy

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Phenolic compounds in basil (Ocimum basilicum) plants grown under a controlled environment are reduced due to the absence of ultraviolet (UV) radiation and low photosynthetic photon flux density (PPFD). To characterize the optimal UV-B radiation dose and PPFD for enhancing the synthesis of phenolic compounds in basil plants without yield reduction, green and purple basil plants grown at two PPFDs, 160 and 224 μmol·m−2·s−1, were treated with five UV-B radiation doses including control, 1 h·d−1 for 2 days, 2 h·d−1 for 2 days, 1 h·d−1 for 5 days, and 2 h·d−1 for 5 days. Supplemental UV-B radiation suppressed plant growth and resulted in reduced plant yield, while high PPFD increased plant yield. Shoot fresh weight in green and purple basil plants was 12%–51% and 6%–44% lower, respectively, after UV-B treatments compared to control. Concentrations of anthocyanin, phenolics, and flavonoids in green basil leaves increased under all UV-B treatments by 9%–18%, 28%–126%, and 80%–169%, respectively, and the increase was greater under low PPFD compared to high PPFD. In purple basil plants, concentrations of phenolics and flavonoids increased after 2 h·d−1 UV-B treatments. Among all treatments, 1 h·d−1 for 2 days UV-B radiation under PPFD of 224 μmol·m−2·s−1 was the optimal condition for green basil production under a controlled environment.

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Section: Impacts Of Uv-b and Ppfd On Photosynthesis Relative Chloropmentioning

confidence: 42%

Section: Impacts Of Uv-b and Ppfd On Photosynthesis Relative Chloropmentioning

confidence: 44%

Pre-Harvest UV-B Radiation and Photosynthetic Photon Flux Density Interactively Affect Plant Photosynthesis, Growth, and Secondary Metabolites Accumulation in Basil (Ocimum basilicum) Plants

Dou

Niu

Gu³

2019

Agronomy

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“…Elevated O 3 is known to produce a decline in the availability of carbon in leaves by impairing stomatal function and influencing Rubisco carboxylation capacity, which can alter carbon balance of plants, decreasing the allocation of carbon to roots and shoots and leading to an altered biomass of shoots and roots ( Andersen, 2003 ; Fiscus et al, 2005 ; Matyssek et al, 2008 ). Meanwhile, enhanced UV radiation also could alter biomass of shoots and roots in many plant species, because exceeding ambient UV radiation intensity could directly affect photosynthesis systems and phyto-hormones and indirectly impact stomatal closure ( Kakani et al, 2003 ; Yadav et al, 2017 ). Thus, to better understanding the mechanism of root growth in response to elevated O 3 and enhanced UV-B radiation, plant biomass allocation (root biomass: shoot biomass and root nodule biomass: shoot biomass) needs to be further studied.…”

Section: Discussionmentioning

confidence: 99%

Combined Effects of Elevated O3 Concentrations and Enhanced UV-B Radiation of the Biometric and Biochemical Properties of Soybean Roots

Mao

Zhao

et al. 2017

Front. Plant Sci.

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Enhanced ultraviolet-B (UV-B) radiation and elevated tropospheric ozone alone may inhibit the growth of agricultural crops. However, research regarding their combined effects on growth and biochemical properties of roots is still scarce. Using open top chambers, we monitored the response of growth, secondary metabolites, endogenous hormones and enzyme activities of soybean roots to elevated O3 and enhanced UV-B individually and in combination at stages of branching, flowering and podding. Our results indicated that the root biomass decreased by 23.6, 25.2, and 27.7%, and root oxidative capacity declined by11.2, 39.9, and 55.7% exposed to elevated O3, enhanced UV-B, and O3 + UV-B, respectively, compared to the control treatment. Concentrations of quercetin and ABA were significantly increased, while concentrations of total polyphenol and P-coumaric acid responded insignificantly to elevated O3, enhanced UV-B, and O3 + UV-B during the whole period of soybean growth. Elevated O3, enhanced UV-B and O3 + UV-B showed significant negative effects on superoxide dismutase (EC 1.15.1.1) activity at flowering stage, on activities of peroxidase (EC 1.11.1.7) and catalase (EC 1.11.1.6) at podding stage, on ascorbate peroxidase activity during the whole period of soybean growth. Moreover, compared to hormones and enzyme activity, secondary metabolisms showed stronger correlation with root growth exposed to elevated O3 and enhanced UV-B individually and in combination. Our study concluded that combined effects of O3 and UV-B radiation significantly exacerbated the decline of soybean root growth, and for annual legumes, the inhibited root growth exposed to O3 and/or UV-B radiation was mostly associated with secondary metabolisms (especially flavonoids).

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