Effect of UV-B Radiation on Leguminous Plants

Choudhary, Krishna Kumar; Agrawal, Shashi Bhushan

doi:10.1007/978-3-319-48006-0_5

Cited by 4 publications

(1 citation statement)

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“…A significant decline in a number of leaves plant -1 and leaf area showed direct sensitivity of leaf to eUV-B, as it attributes with the inhibition of cell division and cell expansion reduction. Choudhary and Agrawal (2017) suggested that the reduction in leaf area correlates with the inhibition of overall plant growth than photosynthesis. This study also suggested the effects of eUV-B treatment were stage specific with more drastic reduction at 45 and 75 DAG compared to 110 DAG, which also coincides with the UV-B has also reported significant alterations (either positive or negative) on the reproductive performance of different plants (Llorens et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Effect on essential oil components and wedelolactone content of a medicinal plant Eclipta alba due to modifications in the growth and morphology under different exposures of ultraviolet-B

Rai

Agrawal

2020

Physiol Mol Biol Plants

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In the present study sensitivity of a medicinal plant Eclipta alba L. (Hassk) (False daisy) was assessed under intermittent (IT) and continuous (CT) doses of elevated ultraviolet-B (eUV-B). Eclipta alba is rich in medicinally important phytochemical constituents, used against several diseases. The hypothesis of this study is that alterations in UV-B dose may modify the quantity and quality of medicinally valuable components with changes in the morphological and physiological parameters of test plant. To fulfill our hypothesis IT and CT of eUV-B (ambient ± 7.2 kJ m -2 day -2 ) was given for 130 and 240 h respectively to assess the impact of UV-B stress. Growth and physiological parameters were adversely affected under both the treatments with varying magnitude. The observation of leaf surfaces showed increase in stomatal and trichome densities suggesting the adaptive resilience of the plants against UV-B. Besides, biosynthesis of wedelolactone, a major medicinal compound of E. alba was observed to be stimulated under UV-B exposure. The essential oil content was reduced under IT while increased under CT. A total of 114 compounds were identified from oil extract of E. alba. n-Pentadecane (25.79%), n-Octadecane (12.98%), b-Farnesene (9.43%), a-Humulene (4.95%) (E)-Caryophyllene (4.87%), Phytol (4.25%), a-Copaene (2.26%), Humulene epoxide (1.46%), b-Pinene (1.07) and b-Caryophyllene oxide (1.06%) were identified as major components of oil. CT induced the synthesis of some medicinally important compounds such as a-terpineol, dcadinene, linolenic acid, methyl linoleate and myristic acid amide. Hence, the study revealed that continuous UV-B exposure of low intensity could be helpful for commercial exploitation of essential oil in E. alba.

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Section: Discussionmentioning

confidence: 99%

Effect on essential oil components and wedelolactone content of a medicinal plant Eclipta alba due to modifications in the growth and morphology under different exposures of ultraviolet-B

Rai

Agrawal

2020

Physiol Mol Biol Plants

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A quantitative analysis of vertebrate environmental DNA degradation in soil in response to time, UV light, and temperature

Guthrie,

Cooper,

Bateman

et al. 2024

Environmental DNA

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Environmental DNA (eDNA) degradation influences the effectiveness of eDNA‐based biodiversity monitoring, but the factors that determine the rate of decay of eDNA in terrestrial environments are poorly understood. We assessed the persistence of vertebrate eDNA from a mock vertebrate community created with soil from zoo enclosures holding 10 target species from different taxonomic classes (reptiles, birds, and mammals) and of different biomass (little penguin and giraffe). We examined species detection rates resulting from eDNA metabarcoding, as well as relative eDNA concentrations via qPCR, from soil samples over eight time points (0–12 weeks), during exposure to three ambient temperatures (10, 25, and 40°C) and three levels of ultraviolet B (UV‐B) radiation (0%, 50%, and 100% intensity). We recorded considerable variation in detectability between species, independent of temperature, and UV‐B effects. Quantitative polymerase chain reaction (PCR) indicated degradation of eDNA over time for all temperature and UV treatments, although it was still possible to detect eDNA from some species after 12 weeks. Degradation rates were lowest for high UV‐B treatments, presumably due to UV‐B reducing bacterial metabolism. The temperatures investigated did not influence eDNA decay. Our results indicate that eDNA in soil can persist under a range of temperatures and high UV radiation for longer than expected. Sheltered sites with minimal UV‐B radiation, which have previously been considered ideal sites for terrestrial eDNA collection, may not be optimal for eDNA persistence in some cases due to microbial decay. A better understanding of eDNA degradation in terrestrial environments is needed to enhance the accuracy of eDNA metabarcoding for surveying terrestrial vertebrate communities.

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