Effect of supplemental ultraviolet-B radiation on <em>Withania</em> <em>somnifera </em>L. (Dunal): An appraisal of morphological, physiological and biochemical characteristics
IR@NISCAIR: CSIR-NISCAIR, New Delhi - ONLINE PERIODICALS REPOSITORY (NOPR)
View Archive Info| Field | Value | |
| Title |
Effect of supplemental ultraviolet-B radiation on <em>Withania</em> <em>somnifera </em>L. (Dunal): An appraisal of morphological, physiological and biochemical characteristics
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| Creator |
Takshak, S
Agrawal, SB |
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| Subject |
Antioxidants
Ascorbic acid Ashwagandha Chlorophyll IAA oxidase activity Indian ginseng Phenolics Photosynthesis Stratospheric ozone Stress α-Tocopherol Thiols UV-B Vitamin C Vitamin E |
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| Description |
845-852
<em>Withania somnifera </em> L. (Dunal), commonly called Indian Ginseng or Ashwagandha, is an indigenous medicinal plant and has been a source of numerous pharmacological compounds for centuries, and ultraviolet-B (UV-B) radiation is one of the potent factors capable of influencing the plant’s performance, consequently influencing its medicinal properties. UV-B studies on medicinal plants are scarce, especially with respect to the overall plant performance. In the present study, we subjected <em>W</em>.<em> somnifera</em> to supplemental UV-B (s-UV-B) radiation (+3.6 kJ m<sup>-2</sup> day<sup>-1</sup>) above ambient to study its morphological, physiological, and biochemical characteristics at three sampling ages (40, 70 and 100 days after transplantation). All growth characteristics, except root length, reduced under s-UV-B treatment. Physiological parameters, such as photosynthetic rate (P<sub>s</sub>), stomatal conductance (g<sub>s</sub>) and water use efficiency (WUE) decreased under s-UV-B while internal CO<sub>2 </sub>(C<sub>i</sub>) increased. Quantum yield (F<sub>v</sub>/F<sub>m</sub>) also recorded a decline at all sampling ages. Protein and chlorophyll contents decreased while phenolics and antioxidants (ascorbic acid, α-tocopherol and thiols) increased in exposed leaves and roots. IAA oxidase activity also increased in both plant parts at all ages. The study concludes that s-UV-B stress is a potent factor in increasing the concentrations of defence compounds and antioxidants to optimise the plant performance under this stress. |
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| Date |
2017-12-08T09:09:34Z
2017-12-08T09:09:34Z 2017-12 |
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| Type |
Article
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| Identifier |
0975-1009 (Online); 0019-5189 (Print)
http://nopr.niscair.res.in/handle/123456789/43231 |
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| Language |
en_US
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| Rights |
<img src='http://nopr.niscair.res.in/image/cc-license-sml.png'> <a href='http://creativecommons.org/licenses/by-nc-nd/2.5/in' target='_blank'>CC Attribution-Noncommercial-No Derivative Works 2.5 India</a>
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| Publisher |
NISCAIR-CSIR, India
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| Source |
IJEB Vol.55(12) [December 2017]
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