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Foliar Application of Glycine Betaine Alters Sugar Metabolism of Wheat Leaves Under Prolonged Field Drought Stress

  • N. GuptaEmail author
  • S. K. Thind
Research Article
  • 64 Downloads

Abstract

The present investigation was carried out to examine the alterations in contents of various sugars in a set of 19 wheat genotypes under drought stress. In addition, foliar application of glycine betaine (GB, 100 mM) was done to explore participation of this osmolyte in drought response mechanism. Drought stress caused a significant increase in total soluble sugars (TSS) and starch levels, at both maximum tillering and anthesis stages. Activities of sucrose phosphate synthase (Suc-P-syn) and sucrose synthase (Suc syn) were also increased in drought stressed plants at both the stages. Exogenous application of GB resulted in higher TSS under drought stress; however reduced levels of starch were observed at anthesis in GB treated plants. GB application caused a decline in activity of Suc-P-syn and Suc syn at both stages. The alterations in sugar levels of GB sprayed plants suggested that regulation of sugar metabolism could undergo modifications (upstream or downstream) in presence of osmolytes like GB. Genotype-specific response to GB spray resulted in yield benefits in selected genotypes under drought stress.

Keywords

Drought stress Glycine betaine Sucrose phosphate synthase Sucrose synthase Total sugars Wheat 

Notes

Acknowledgements

This work was supported by Council of Scientific and Industrial Research (Project No. 09/272/0129-EMR-I), New Delhi, India.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no any conflict of interest to publish this manuscript.

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Copyright information

© The National Academy of Sciences, India 2018

Authors and Affiliations

  1. 1.Department of Plant Breeding and GeneticsPunjab Agricultural UniversityLudhianaIndia
  2. 2.Department of BotanyPunjab Agricultural UniversityLudhianaIndia

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