Comparative Assessment of UV-B Priming on Vegetative and Reproductive Stages of Oat and Barley
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RESEARCH ARTICLE
Comparative Assessment of UV-B Priming on Vegetative and Reproductive Stages of Oat and Barley S. Singh1 • K. Rai1 • S. B. Agrawal1 • M. Agrawal1
Received: 11 June 2019 / Revised: 12 October 2019 / Accepted: 16 October 2019 Ó The National Academy of Sciences, India 2019
Abstract Barley and oat were irradiated with elevated UV-B (? 3.6 kJ m-2 d-1; 280–315 nm) during the vegetative stage, and their performances were evaluated at the tillering and panicle development stages (PDS). Physiological and biochemical measurements revealed that barley and oat performed almost alike against UV-B at the tillering stage, but the stress imprints led barley to display better performance at the PDS. Chlorophyll content increased under elevated UV-B in both the test crops with a higher increase in barley. Also, efficient synthesis of UVB-absorbing compounds, i.e. flavonoids and phenolics in barley at the PDS, protected the photosynthetic machinery. Both the crops showed stimulations in growth responses under elevated UV-B except for root length in oat at the PDS. At the PDS, the reduction in total biomass of oat was accompanied with increased biomass allocation to the root portion suggesting the limiting factor for growth was belowground. Results clearly showed that UV-B priming during the vegetative stage enhanced tolerance against stress at the PDS in barley, whereas oat showed recovery for most of the measured parameters except ascorbic acid Significance Statement In this study, the vegetative growth stage is primed with UV-B and the stress imprint is utilized to study the comparative response of two important crops, oat and barley at reproductive stage, in a tropical region where ambient UV-B is naturally high. During the reproductive stage of oat and barley, the ambient UV-B was higher compared to that of the vegetative stage, and though that caused a loss in productivity, but the priming activity helped the plants in coping the stress with improved plant performance. & M. Agrawal [email protected] 1
Laboratory of Air Pollution and Global Climate Change, Department of Botany, Institute of Science, Banaras Hindu University, Varanasi 221010, India
and biomass. Therefore, improved plant tolerance against UV-B during the panicle growth in barley is meaningful for a higher productivity. Keywords Elevated UV-B Barley Oat Stress imprints Vegetative growth stage Panicle development stage
Introduction Ozone (O3) hole has reduced by over 1.5 million square miles in around 15-year period i.e. between 2000 and 2015 [1], but the substantial recovery of the O3 layer is not expected in coming 40–80 years. Therefore, the influx of UV-B radiation perceived at the Earth’s surface is larger than normal and its intensity/amount mainly depends on the geographical position of that region. Due to Earth’s geographical structure and orientation of Sun’s position, it is observed that tropical region receives more UV-B radiation due to lesser solar zenith angle. Further, IndoGangetic plain of India which lies in th
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