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Plant function and evolutionary biology
RESEARCH ARTICLE

Ultrasonic treatment to enhance seed germination and vigour of wheat (Triticum durum) in association with γ-aminobutyric acid (GABA) shunt pathway

Nezar H. Samarah https://orcid.org/0000-0002-2820-3382 A * , Nisreen A. AL-Quraan https://orcid.org/0000-0001-7328-054X B and Batool S. Al-Wraikat A
+ Author Affiliations
- Author Affiliations

A Department of Plant Production, Faculty of Agriculture, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan.

B Department of Biotechnology and Genetic Engineering, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid 22110, Jordan.

* Correspondence to: nsamarah@just.edu.jo

Handling Editor: Thomas Roberts

Functional Plant Biology 50(4) 277-293 https://doi.org/10.1071/FP22211
Submitted: 14 September 2022  Accepted: 27 December 2022   Published: 13 January 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Treatments of wheat (Triticum durum L.) seeds with sonication or hydropriming may enhance seed germination and vigour in association with γ-aminobutyric acid (GABA). Therefore, the objective of this study is to examine the effect of sonication and hydropriming treatments on seed germination of wheat through the characterisation of seed germination performance, GABA shunt metabolite level (GABA, glutamate, and alanine), and the level of glutamate decarboxylase (GAD) mRNA transcription. Wheat seeds were exposed to three treatments for 0, 5, 10, 15, and 20 min: (1) sonication with water; (2) sonication without water; and (3) hydropriming without sonication. Treated seeds were evaluated for germination percentage, mean time to germinate, germination rate index in the warm germination test, and seedling emergence and shoot length in the cold test. GABA shunt metabolites level (GABA, glutamate, and alanine), and the level of GAD mRNA transcription were measured for the seeds after treatments and for seedlings during germination and cold tests. Seeds treated with sonication or hydropriming treatments had a higher germination rate index (faster germination) in the standard germination test, and higher seedling emergence and shoot length in the cold test. Seeds treated with sonication or hydropriming treatments showed an enhancement in GABA shunt and their metabolites (alanine and glutamate), and GAD mRNA transcription level compared to untreated-control seeds. In conclusion, the sonication or hydropriming treatments significantly improved the germination performance of wheat and enhanced GABA metabolism to maintain the C:N metabolic balance, especially under cold stress.

Keywords: cold test, GABA: gamma-aminobutyric acid, GAD: glutamate decarboxylase, hydropriming, seed germination, Triticum durum, ultrasonic, wheat.


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