Effects of Short-Term Hypergravity Exposure are Reversible in <Emphasis Type="Italic">Triticum aestivum</Emphasis> L. Caryopses |
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Authors: | Jyotsana P Dixit Sagar S Jagtap Shailendra M Kamble Pandit B Vidyasagar |
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Affiliation: | 1.School of Basic Medical Sciences,Savitribai Phule Pune University,Pune,India;2.Department of Physics,Haribhai V. Desai College,Pune,India;3.Department of Botany,Dr D.Y Patil Arts, Commerce & Science College, Pimpri,Pune,India;4.Swami Ramanand Teerth Marathwada University,Nanded,India |
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Abstract: | Short-term hypergravity exposure is shown to retard seed germination, growth and photosynthesis in wheat caryopses. This study investigates the reversibility of effects of short-term hypergravity on imbibed wheat (Triticum aestivum var L.) caryopses. After hypergravity exposure (500 × g ? 2500 × g for 10 min) on a centrifuge, exposed caryopses were kept under normal gravity (1 × g) up to six days and then sown on agar. Results of the present study showed that percentage germination and growth were completely restored for DAY 6 compared to DAY 0. Restoration of germination and growth was accompanied by increased α-amylase activity. The specific activity of antioxidative enzyme viz. catalase and guaiacol peroxidase was lowered on DAY 6 compared to DAY 0 suggesting an alleviation of oxidative cellular damage against hypergravity stress. Chlorophyll pigment recovery along with chlorophyll fluorescence (PI and Fv/Fm) on DAY 6 indicates a transient rather than permanent damage of the photosynthetic apparatus. Thus, our findings demonstrate that short-term hypergravity effects are reversible in wheat caryopses. The metabolic cause of restoration of seed germination and growth upon transferring the caryopses to normal gravity is performed by a reactivation of carbohydrate- metabolizing enzymes, α-amylase and alleviation of oxidative stress damage with subsequent recovery of chlorophyll biosynthesis and photosynthetic activity. |
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